A last bit of cleaning up temp files after tests

refactor pset operator
Moved blenderbim tests temporary files to separate directory
2026-08-09 09:21:46 +00:00 · 2023-03-02 10:45:00 +05:00 · 2023-03-01 15:37:19 +01:00 · 2023-03-01 18:46:13 +05:00 · 2023-03-01 17:37:17 +05:00 · 2023-03-01 22:25:12 +11:00
1048 changed files with 482550 additions and 17760 deletions
@@ -29,7 +29,7 @@ jobs:
        sudo apt-get install --no-install-recommends \
        git cmake gcc g++ libboost-all-dev python3-all-dev swig libpcre3-dev libxml2-dev \
        libocct-foundation-dev libocct-modeling-algorithms-dev libocct-modeling-data-dev libocct-ocaf-dev libocct-visualization-dev libocct-data-exchange-dev \
-        libhdf5-dev libcgal-dev
+        libhdf5-dev libcgal-dev nlohmann-json3-dev

    -
      name: ccache
@@ -61,6 +61,8 @@ jobs:
         -DGMP_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu \
         -DMPFR_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu \
         -DHDF5_INCLUDE_DIR=/usr/include/hdf5/serial \
+         -DGLTF_SUPPORT=On \
+         -DJSON_INCLUDE_DIR=/usr/include \
         ../cmake
        make -j $(nproc)
        make install
@@ -19,20 +19,19 @@ jobs:
      - uses: actions/checkout@v2
      - uses: actions/setup-python@v2
        with:
-          python-version: '3.x'
+          python-version: '3.10'
      - name: Build package
        run: |
          cd src/bcf
          pip install build
          python -m build
+      - name: Test
+        run: |
+          cd src/bcf
+          make test
      - name: Publish package
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          user: __token__
          password: ${{ secrets.PYPI_TOKEN }}
          packages_dir: src/bcf/dist
-
-
-
-
-
@@ -43,7 +43,7 @@ jobs:
      - uses: actions/checkout@v2
      - uses: actions/setup-python@v2 # https://github.com/actions/setup-python
        with:
-          python-version: '3.7.7' # Version range or exact version of a Python version to use, using SemVer's version range syntax
+          python-version: '3.10.9' # Version range or exact version of a Python version to use, using SemVer's version range syntax
          architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
      - run: echo ${{ env.DATE }}

@@ -61,7 +61,6 @@ jobs:
      - uses: actions/checkout@v2
      - uses: actions/setup-python@v2 # https://github.com/actions/setup-python
        with:
-          python-version: '3.7.7' # Version range or exact version of a Python version to use, using SemVer's version range syntax
          architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
      - run: echo ${{ env.DATE }}
      - name: Get current date
@@ -1,10 +1,17 @@
 name: ci-ifcopenshell-conda-daily

 on:
-  workflow_run:
-    workflows: ["ci"]
-    types:
-      - completed
+  push:
+      paths:
+        - .github/workflows/ci-ifcopenshell-conda-daily.yml
+  schedule:
+  #         ┌───────────── minute (0 - 59)
+  #         │  ┌───────────── hour (0 - 23)
+  #         │  │ ┌───────────── day of the month (1 - 31)
+  #         │  │ │ ┌───────────── month (1 - 12 or JAN-DEC)
+  #         │  │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
+  #         *  * * * *
+  - cron: "49 23 * * *" # 11min before utc midnight every day

 jobs:
  activate:
@@ -26,19 +33,16 @@ jobs:
      fail-fast: false
      matrix:
        pyver: [
-          { name: py39, distver: '3.9' },
-          { name: py310, distver: '3.10'}
+          { name: py310, distver: '3.10'},
+          { name: py311, distver: '3.11'}
        ]
        platform: [
-          { name: Windows, distver: windows-2022, upload: 'false' },
-          { name: Windows, distver: windows-2019, upload: 'true' },
-          { name: Linux, distver: ubuntu-20.04,  upload: 'false' },
-          { name: Linux, distver: ubuntu-18.04,  upload: 'true' },
-          { name: macOS, distver: macos-11, upload: 'true' },
-          { name: macOS, distver: macos-10.15, upload: 'false' }
+          { name: Windows, distver: windows-2022, upload: 'true' },
+          { name: Linux, distver: ubuntu-22.04,  upload: 'true' },
+          { name: macOS, distver: macos-12, upload: 'true' }
        ]
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
        with:
          submodules: recursive
      - name: Download MacOSX SDK
@@ -57,8 +61,10 @@ jobs:
      - name: build, test and upload ifcopenshell
        if: ${{ matrix.platform.upload == 'true' }}
        run: |
-          conda-build . --python ${{ matrix.pyver.distver }} -c conda-forge --token ${{ secrets.ANACONDA_TOKEN }} --user ifcopenshell --no-remove-work-dir
+          conda-build . --python ${{ matrix.pyver.distver }} -c conda-forge --token ${{ secrets.ANACONDA_TOKEN }} --user ifcopenshell
+        working-directory: ./conda
      - name: build & test ifcopenshell
        if: ${{ matrix.platform.upload == 'false' }}
        run: |
-          conda-build . --python ${{ matrix.pyver.distver }} -c conda-forge --no-remove-work-dir
+          conda-build . --python ${{ matrix.pyver.distver }} -c conda-forge
+        working-directory: ./conda
@@ -8,7 +8,11 @@ on:
    #         │  │ │ ┌───────────── month (1 - 12 or JAN-DEC)
    #         │  │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
    #         *  * * * *
-    - cron: "49 23 1 * *" # 11min before utc midnight
+    - cron: "0 0 18 * *"
+  push:
+    paths:
+      - '.github/workflows/ci-ifcopenshell-pypi.yml'
+

 env:
  major: 0
@@ -31,7 +35,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        pyver: [py36, py37, py38, py39, py310]
+        pyver: [py36, py37, py38, py39, py310, py311]
        config:
          - {
            name: "Windows Build",
@@ -53,7 +57,7 @@ jobs:
      - uses: actions/checkout@v2
      - uses: actions/setup-python@v2 # https://github.com/actions/setup-python
        with:
-          python-version: '3.7.7' # Version range or exact version of a Python version to use, using SemVer's version range syntax
+          python-version: '3.10' # Version range or exact version of a Python version to use, using SemVer's version range syntax
          architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
      - run: echo ${{ env.DATE }}
      - name: Get current date
@@ -85,6 +85,7 @@ jobs:
          sudo /usr/bin/python -m pip install isodate
          sudo /usr/bin/python -m pip install lark
          sudo /usr/bin/python -m pip install networkx
+          sudo /usr/bin/python -m pip install tabulate

      - name: Test
        run: |
@@ -86,6 +86,20 @@ jobs:
          sudo make -j $(nproc)
          sudo make install

+      - name: Run IfcConvert on Sample files
+        run: |
+          (find test/input src/blenderbim/test/files -name '*.ifc' | while read i; do \
+            echo $i | tee -a log; \
+            timeout 1m "$(which IfcConvert)" -yv "$i" "$i.obj" --validate >> log 2>&1; \
+            echo $i $? >> statuses; \
+          done) || true
+          echo Failed 
+          grep -v 0$ statuses
+          grep -v 0$ statuses | wc -l
+          echo Succeeded
+          grep 0$ statuses
+          grep 0$ statuses | wc -l
+
      - name: Install Python dependencies
        run: |
          sudo /usr/bin/python -m pip install -U pip
@@ -95,6 +109,8 @@ jobs:
          sudo /usr/bin/python -m pip install isodate
          sudo /usr/bin/python -m pip install lark
          sudo /usr/bin/python -m pip install networkx
+          sudo /usr/bin/python -m pip install https://github.com/Andrej730/aud/archive/refs/heads/master-reduced-size.zip
+          sudo /usr/bin/python -m pip install tabulate

      - name: Test
        run: |
@@ -73,3 +73,20 @@ _build/

 # IDS Docs
 src/ifcopenshell-python/test/build
+
+# tox cache
+.tox/
+*.egg-info/
+
+# mypy cache
+.mypy_cache
+
+# blenderbim libs
+src/blenderbim/blenderbim/libs
+
+# blenderbim test temp files
+src/blenderbim/test/files/temp
+
+# ifcopenshell swig and compiled files
+src/ifcopenshell-python/ifcopenshell/_ifcopenshell_wrapper.so
+src/ifcopenshell-python/ifcopenshell/ifcopenshell_wrapper.py
@@ -1,81 +0,0 @@
-language: cpp
-compiler: gcc
-cache: ccache
-os: linux
-dist: focal
-addons:
-  apt:
-    update: true
-    packages:
-    - libboost-date-time-dev
-    - libboost-filesystem-dev
-    - libboost-iostreams-dev
-    - libboost-program-options-dev
-    - libboost-regex-dev
-    - libboost-system-dev
-    - libboost-thread-dev
-    - libocct-data-exchange-dev
-    - libocct-foundation-dev
-    - libocct-modeling-algorithms-dev
-    - libocct-modeling-data-dev
-    - libxml2-dev
-    - nlohmann-json3-dev
-    - opencollada-dev
-    - python3-all-dev
-    - python3-pip
-    - swig
-    - libhdf5-dev
-
-before_script:
-  - if [ $TRAVIS_OS_NAME == "linux" ]; then ccache -z; fi
-  
-install:
-  # for IDS
-  - python3 -m pip install xmlschema
-
-script:
-  - pwd
-  - mkdir build && cd build
-  - |
-    cmake \
-    -DCMAKE_C_COMPILER_LAUNCHER=ccache \
-    -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-    -DOCC_INCLUDE_DIR=/usr/include/opencascade \
-    -DOCC_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu \
-    -DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/python3 \
-    -DPYTHON_INCLUDE_DIR:PATH=/usr/include/python3.8 \
-    -DPYTHON_LIBRARY:FILEPATH=/usr/lib/x86_64-linux-gnu/libpython3.8.so \
-    "-DSCHEMA_VERSIONS=2x3;4" \
-    -DGLTF_SUPPORT=On \
-    -DJSON_INCLUDE_DIR=/usr/include \
-    -DHDF5_INCLUDE_DIR=/usr/include/hdf5/serial \
-    ../cmake
-
-  # TODO: Drop sudo
-  - sudo make -j $(nproc) install
-
-  - cd ../test
-  - /usr/bin/python tests.py
-  - /usr/bin/python ../src/ifcopenshell-python/ifcopenshell/test_ids.py
-
-  - cd input
-
-  - /usr/local/bin/IfcConvert -yv acad2010_walls.ifc acad2010_walls.glb
-
-  - /usr/bin/python -c "from io import open; import ifcopenshell; f = ifcopenshell.open('encoding.ifc'); assert list(map(ord, f[1][0])) == [39, 97, 39, 32, 49, 109, 179, 32, 8804, 32, 53, 109, 179, 32, 8805, 32, 49, 48, 109, 179]"
-
-  - |
-    (for i in *.ifc; do \
-    echo $i | tee -a log; \
-    timeout 1m /usr/local/bin/IfcConvert -yv "$i" "$i.dae" --validate >> log 2>&1; \
-    echo $i $? >> statuses; \
-    done) || true
-  - echo Failed
-  - grep -v 0$ statuses
-  - grep -v 0$ statuses | wc -l
-  - echo Succeeded
-  - grep 0$ statuses
-  - grep 0$ statuses | wc -l
-
-after_script:
-  - if [ $TRAVIS_OS_NAME == "linux" ]; then ccache -s; fi
@@ -1,325 +1,74 @@
+
 IfcOpenShell 
 ============
-IfcOpenShell is an open source ([LGPL]) software library for working with the Industry Foundation Classes ([IFC]) 
-file format. Extensive geometric support is implemented for the IFC releases [IFC2x3 TC1] and [IFC4 Add2 TC1].
-Support for parsing is provided for IFC4x1, IFC4x2, and the IFC4x3 release candidates. Extending with support for
-arbitrary IFC schemas is possible at compile-time when using C++ and at run-time when using Python.

-For more information, see
-* [http://ifcopenshell.org](http://ifcopenshell.org)  
-* [http://academy.ifcopenshell.org](http://academy.ifcopenshell.org)
+IfcOpenShell is an open source ([LGPL]) software library for working with Industry Foundation Classes ([IFC]). Complete
+parsing support is provided for [IFC2x3 TC1], [IFC4 Add2 TC1], IFC4x1, IFC4x3, and IFC4x3. Extensive geometric support
+is implemented for the IFC releases [IFC2x3 TC1] and [IFC4 Add2 TC1]. Extending with support for arbitrary IFC schemas
+is possible at compile-time when using C++ and at run-time when using Python.
+
+In addition to a C++ and Python API, IfcOpenShell comes with an ecosystem of tools, notably including IfcConvert (an application to convert IFC models to
+other formats), the BlenderBIM Add-on (an add-on to Blender providing a graphical IFC authoring platform), and many
+other libraries, CLI apps, and more. Support is also provided for auxiliary standards such as BCF and IDS.
+
+For more information, see:
+
+* [IfcOpenShell Website](http://ifcopenshell.org)
+* [IfcOpenShell Documentation](http://blenderbim.org/docs-python)
+  * [IfcOpenShell C++ Installation](https://blenderbim.org/docs-python/ifcopenshell/installation.html)
+  * [IfcOpenShell Python Installation](https://blenderbim.org/docs-python/ifcopenshell-python/installation.html)
+  * [IfcOpenShell Python Hello World Tutorial](https://blenderbim.org/docs-python/ifcopenshell-python/hello_world.html)
+* [BlenderBIM Add-on Website](https://blenderbim.org)
+* [BlenderBIM Add-on Documentation](http://blenderbim.org/docs)
+  * [Add-on Installation](https://blenderbim.org/docs/users/installation.html)
+  * [Exploring an IFC model](https://blenderbim.org/docs/users/exploring_an_ifc_model.html)

 | Service                                         | Status                                                                                                                                       |
 | ----------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
 | Anaconda Daily Build                            | [![Anaconda-Server Badge](https://img.shields.io/conda/vn/ifcopenshell/ifcopenshell)](https://anaconda.org/ifcopenshell/ifcopenshell)        |
 | Anaconda v0.7.0 Stable                          | [![Anaconda-Server Badge](https://img.shields.io/conda/vn/conda-forge/ifcopenshell)](https://anaconda.org/conda-forge/ifcopenshell)          |
 | PyPi Daily Build                                | [![PyPi Badge](https://img.shields.io/pypi/v/ifcopenshell)](https://pypi.org/project/ifcopenshell/)                                          |
-| ArchLinux AUR Package                           | [![AUR Badge](https://img.shields.io/aur/version/ifcopenshell-git)](https://aur.archlinux.org/packages/ifcopenshell-git)                     |
+| ArchLinux AUR Package Stable                           | [![AUR Badge](https://img.shields.io/aur/version/ifcopenshell)](https://aur.archlinux.org/packages/ifcopenshell)                     |
+| ArchLinux AUR Package git                           | [![AUR Badge](https://img.shields.io/aur/version/ifcopenshell-git)](https://aur.archlinux.org/packages/ifcopenshell-git)                     |
 | BlenderBIM Add-on Chocolatey (under moderation) | [![Chocolatey Badge](https://img.shields.io/chocolatey/v/blenderbim-nightly)](https://community.chocolatey.org/packages/blenderbim-nightly/) |
 | Sponsor development on OpenCollective           | [![Financial Contributors](https://opencollective.com/opensourcebim/tiers/badge.svg)](https://opencollective.com/opensourcebim/)             |
 | Docker hub                                      | [![Docker Pulls](https://img.shields.io/docker/pulls/aecgeeks/ifcopenshell)](https://hub.docker.com/r/aecgeeks/ifcopenshell)                 |

-Prerequisites
-------------
-* Git
-* CMake (3.1.3 or newer)
-* Windows: [Visual Studio] 2008 to 2019 (2022 not yet supported by dependency CMake) with C++ toolset (or [Visual C++ Build Tools]) or [MSYS2] + MinGW
-* *nix: GCC 4.7 or newer, or Clang (any version)
-
-Dependencies
-------------
-* [Boost](http://www.boost.org/)
-* [Open Cascade](https://dev.opencascade.org/) - *optional*, but required for building IfcGeom
-  ([official](https://dev.opencascade.org/release), "OCCT", or [community edition](https://github.com/tpaviot/oce), "OCE")  
-  For converting IFC representation items into BRep solids and tessellated meshes
-* [OpenCOLLADA](https://github.com/khronosGroup/OpenCOLLADA/) - *optional*  
-  For IfcConvert to be able to write tessellated Collada (.dae) files
-* [SWIG](http://www.swig.org/) and [Python](https://www.python.org/) - *optional*  
-  For building the IfcOpenShell Python interface and the Blender add-on
-* [3ds Max SDK](http://www.autodesk.com/products/3ds-max/free-trial) - *optional*  
-  For building the 3ds Max plug-in.
-  All recent versions of 3ds Max (2014 and newer) are 64-bit only, so a 64-bit installation is assumed.
-
-Building IfcOpenShell
---------------------
-
-Note 1: The path where the source code is cloned to can contain spaces but non-ASCII characters are very likely to cause problems with the build.
-
-Note 2: If you had not used `git clone --recursive https://github.com/IfcOpenShell/IfcOpenshell.git`, update the submodules by running `git submodule init & git submodule update`.
-
-Note 3: Be careful with special characters is the path when using the nix or win build scripts, because the OpenCASCADE build will fail on paths containing ++ and likely other situations.
-
-### Compiling on Windows
-The preferred way to fetch and build this project's dependencies is to use the build scripts
-in win/ folder. **See [win/readme.md] for more information**.
-
-#### Using Visual Studio
-Instructions in a nutshell (**assuming Visual Studio 2015 x64 environment variables set**):
-
-    > cd IfcOpenShell\win
-    > build-deps.cmd
-    > run-cmake.bat
-
-NB: `build-deps.cmd` need to be ran from the directory containing it, i.e. the `./win` folder.
-
-You can now open and build the solution file in Visual Studio:
-
-    > ..\build-vs2015-x64\IfcOpenShell.sln
-
-As the scripts default to using the `RelWithDebInfo` configuration, and a freshly created solution by CMake defaults
-to `Debug`, make sure to switch the used build configuration. Build the `INSTALL` project (right-click -> Project
-Only) to deploy the headers and binaries into a single location if wanted/needed.
-
-Alternatively, one can use the utility batch file(s) to build and install the project easily from the command-line
-(installing a project will build it also, if required):
-
-    > install-ifcopenshell.bat
-
-#### Using MSYS2 + MinGW
-
-Start the MSYS2 Shell and then:
-
-    $ cd IfcOpenShell/win
-    $ ./build-deps.sh
-    $ ./run-cmake.sh
-    $ ./install-ifcopenshell.sh
-
-#### Using Bash on Ubuntu on Windows
-
-Start Bash on Ubuntu on Windows and follow the instructions below. Compiling on Ubuntu 14.04.4 LTS using GCC 4.8.4
-or Clang 3.5 has been confirmed to work.
-
-### Compiling on *nix
-
-The following instructions are for Ubuntu, modify as required for other operating systems. [nix/build-all.py] script
-can be experimented with and studied for pointers for other operating systems, but note that this script is not currently
-meant to be used for a typical IfcOpenShell workspace setup.
-
-Note 1: It is recommended to use OCCT for IfcOpenShell. You could use OCE as well, but sometimes it may lag behind OCCT and 
-therefore not compile with the latest IfcOpenShell.
-
-Note 2: where `make -j` is written, add a number roughly equal to the amount of CPU cores + 1.
-
-**1)** Install most of the prerequisites and dependencies:
-
-    $ sudo apt-get install git cmake gcc g++ libboost-all-dev libcgal-dev
-
-**2a)** Either use an OCCT package from your operating system's software repository
-
-    $ sudo apt-get install libocct-data-exchange-dev libocct-draw-dev libocct-foundation-dev libocct-modeling-algorithms-dev libocct-modeling-data-dev libocct-ocaf-dev libocct-visualization-dev
-
-**2b)** or, if OCCT is not available or the latest code is wanted, obtain and compile OCCT from https://dev.opencascade.org/release
-
-**2c)** or, if you'd like to try using OCE, use the package from your operating system's software repository
-
-    $ sudo apt-get install liboce-foundation-dev liboce-modeling-dev liboce-ocaf-dev liboce-visualization-dev liboce-ocaf-lite-dev
-
-**2d)** or if OCE is not available, or the latest code is wanted, compile OCE yourself (note that the build takes a long time)
-
-    $ sudo apt-get install libftgl-dev libtbb2 libtbb-dev libgl1-mesa-dev libfreetype6-dev
-    $ git clone https://github.com/tpaviot/oce.git
-    $ cd oce
-    $ mkdir build && cd build
-    $ cmake ..
-    $ make -j
-    $ sudo make install
-
-**3)** For building IfcConvert with COLLADA (.dae) support (on by default), OpenCOLLADA is needed:
-
-    $ sudo apt-get install libpcre3-dev libxml2-dev
-    $ git clone https://github.com/KhronosGroup/OpenCOLLADA.git
-    $ cd OpenCOLLADA
-    Using a known good revision, but HEAD should work too:
-    $ git checkout 064a60b65c2c31b94f013820856bc84fb1937cc6
-    $ mkdir build && cd build
-    $ cmake ..
-    $ make -j
-    $ sudo make install
-
-**4)** For building the IfcPython wrapper (on by default), SWIG and Python development are needed, if not already available:
-
-    $ sudo apt-get install python-all-dev swig
-
-**5)** To build IfcOpenShell please take the following steps. Alternatively use environment variables for setting the
-dependencies' paths. `OCC_INCLUDE_DIR` might be needed to set also. `OPENCOLLADA_INCLUDE_DIR` and `OPENCOLLADA_LIBRARY_DIR`
-(and potentially `PCRE_LIBRARY_DIR`) are needed if building with COLLADA support. (`-DCOLLADA_SUPPORT=0` disables it).
-
-    $ cd /path/to/IfcOpenShell
-    $ mkdir build && cd build
-    $ cmake ../cmake -DOCC_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu/ \
-          -DOPENCOLLADA_INCLUDE_DIR="/usr/local/include/opencollada" \
-          -DOPENCOLLADA_LIBRARY_DIR="/usr/local/lib/opencollada"  \
-          -DPCRE_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu/ \
-          -DCGAL_INCLUDE_DIR=/usr/include \
-          -DGMP_INCLUDE_DIR=/usr/include \
-          -DMPFR_INCLUDE_DIR=/usr/include \
-          -DGMP_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu \
-          -DMPFR_LIBRARY_DIR=/usr/lib/x86_64-linux-gnu \
-          -DHDF5_SUPPORT=Off
-    $ make -j
-
-If all worked out correctly you can now use IfcOpenShell. See the examples below.
-
-**6)** Install the project if wanted:
-
-    $ sudo make install
-    
-### Installing on MacOS Using Homebrew
-
-**1)** Install all dependencies using [Homebrew](https://brew.sh/)
-
-```{shell}
-$ brew install boost cmake python3 cgal ftgl gmp libaec opencascade swig hdf5 zlib
-# homebrew automatically links most libraries, except some keg-only ones
-$ brew link zlib --force
-```
-
-**2)** Clone the git repo and its submodules
-```{shell}
-$ git clone --recurse-submodules https://github.com/IfcOpenShell/IfcOpenShell.git 
-```
-**3)** Build IfcOpenShell with flags for Homebrew dependencies: (``/usr/local/``) for Intel machines with x84_64 architecture,
-(``/opt/homebrew/``) for Apple Silicon processors with arm64 architecture.
-```{shell}
-$ cd /path/to/IfcOpenShell
-$ mkdir build && cd build
-# set library flags
-$ export LDFLAGS="$LDFLAGS -Wl,-flat_namespace,-undefined,suppress"
-$ cmake ../cmake
-    -DPYTHON_EXECUTABLE=/opt/homebrew/bin/python3.10 \
-    -DPYTHON_LIBRARY=/opt/homebrew/opt/python@3.10/Frameworks/Python.framework/Versions/3.10/lib/libpython3.10.dylib \
-    -DPYTHON_INCLUDE_DIR=/opt/homebrew/opt/python@3.10/Frameworks/Python.framework/Versions/3.10/include/python3.10/ \
-    -DOCC_LIBRARY_DIR=/opt/homebrew/lib/ \
-    -DOCC_INCLUDE_DIR=/opt/homebrew/include/opencascade/ \
-    -DCGAL_INCLUDE_DIR=/opt/homebrew/include/ \
-    -DGMP_LIBRARY_DIR=/opt/homebrew/lib/ \
-    -DMPFR_LIBRARY_DIR=/opt/homebrew/lib/ \
-    -DHDF5_LIBRARY_DIR=/opt/homebrew/lib/ \
-    -DHDF5_INCLUDE_DIR=/opt/homebrew/include/ \
-    -DCOLLADA_SUPPORT=0
-# `sysctl -n hw.ncpu` returns the number of cpu cores on macOS
-$ make -j$(sysctl -n hw.ncpu)
-```
-
-Note: Make sure to compile using the XCode provided Apple Clang compiler, installed with `xcode-select --install
-`, rather than a ```brew``` installed C/C++ compiler.
-
-Installing IfcOpenShell with Conda
----------------------------------
-Another option for building and installing IfcOpenShell is to use the popular
-[Anaconda Python Distribution](https://www.anaconda.com/download).
-The requirements are spread across a number of channels.
-You can add these channels to your configuration, or specify them all on the command line:
-
-    $ conda install -c conda-forge -c oce -c dlr-sc -c ifcopenshell ifcopenshell
-
-Usage examples
--------------
-
-**Invoking IfcConvert from the command line**
-
-    $ wget -O duplex.zip https://portal.nibs.org/files/wl/\?id=4DsTgHFQAcOXzFetxbpRCECPbbfUqpgo
-    $ unzip duplex.zip
-    $ ./IfcConvert Duplex_A_20110907_optimized.ifc
-    $ less Duplex_A_20110907_optimized.obj
-
-**Using the IfcOpenShell Python interface**
-
-    $ wget -O duplex.zip https://portal.nibs.org/files/wl/\?id=4DsTgHFQAcOXzFetxbpRCECPbbfUqpgo
-    $ unzip duplex.zip
-    $ python
-    >>> import ifcopenshell
-    >>> f = ifcopenshell.open("Duplex_A_20110907_optimized.ifc")
-    >>>
-    >>> # Accessing entity instances by type:
-    >>> f.by_type("ifcwall")[:2]
-    [#91=IfcWallStandardCase('2O2Fr$t4X7Zf8NOew3FL9r',#1,'Basic Wall:Interior - Partition (92mm Stud):144586',$,'Basic Wall:Interior - Partition (92mm Stud):128360',#5198,#18806,'144586'), #92=IfcWallStandardCase('2O2Fr$t4X7Zf8NOew3FLIE',#1,'Basic Wall:Interior - Partition (92mm Stud):143921',$,'Basic Wall:Interior - Partition (92mm Stud):128360',#5206,#18805,'143921')]
-    >>> wall = _[0]
-    >>> len(wall) # number of EXPRESS attributes
-    8
-    >>>
-    >>> # Accessing EXPRESS attributes by name:
-    >>> wall.GlobalId 
-    '2O2Fr$t4X7Zf8NOew3FL9r'
-    >>> wall.Name = "My wall"
-    >>> wall.NonExistingAttr
-    Traceback (most recent call last):
-      File "<stdin>", line 1, in <module>
-      File ".\ifcopenshell.py", line 14, in __getattr__
-        except: raise AttributeError("entity instance of type '%s' has no attribute'%s'"%(self.wrapped_data.is_a(), name)) from None
-    AttributeError: entity instance of type 'IfcWallStandardCase' has no attribute 'NonExistingAttr'
-    >>> wall.GlobalId = 3
-    Traceback (most recent call last):
-      File "<stdin>", line 1, in <module>
-      File ".\ifcopenshell.py", line 26, in __setattr__
-        self[self.wrapped_data.get_argument_index(key)] = value
-      File ".\ifcopenshell.py", line 30, in __setitem__
-        self.wrapped_data.set_argument(idx, entity_instance.map_value(value))
-      File ".\ifc_wrapper.py", line 118, in <lambda>
-        set_argument = lambda self,x,y: self._set_argument(x) if y is None else self
-    ._set_argument(x,y)
-      File ".\ifc_wrapper.py", line 114, in _set_argument
-        def _set_argument(self, *args): return _ifc_wrapper.entity_instance__set_argument(self, *args)
-    RuntimeError: INT is not a valid type for 'GlobalId'
-    >>> # Creating new entity instances
-    >>> f.createIfcCartesianPoint(Coordinates=(1.0,1.5,2.0))
-    #27530=IfcCartesianPoint((1.,1.5,2.))
-    >>> 
-    >>> # Working with GlobalId attributes:
-    >>> import uuid
-    >>> ifcopenshell.guid.compress(uuid.uuid1().hex)
-    '3x4C8Q_6qHuv$P$FYkANRX'
-    >>> new_guid = _
-    >>> owner_hist = f.by_type("IfcOwnerHistory")[0]
-    >>> new_wall = f.createIfcWallStandardCase(new_guid, owner_hist, None, None, Tag='my_tag')
-    >>> new_wall.ObjectType = ''
-    >>> new_wall.ObjectPlacement = new_wall.Representation = None
-    >>>
-    >>> # Accessing entity instances by instance id or GlobalId:
-    >>> f[92]
-    #92=IfcWallStandardCase('2O2Fr$t4X7Zf8NOew3FLIE',#1,'Basic Wall:Interior - Partition (92mm Stud):143921',$,'Basic Wall:Interior - Partition (92mm Stud):128360',#5206,#18805,'143921')
-    >>> f['2O2Fr$t4X7Zf8NOew3FLIE']
-    #92=IfcWallStandardCase('2O2Fr$t4X7Zf8NOew3FLIE',#1,'Basic Wall:Interior - Partition (92mm Stud):143921',$,'Basic Wall:Interior - Partition (92mm Stud):128360',#5206,#18805,'143921')
-    >>>
-    >>> # Writing IFC-SPF files to disk:
-    >>> f.write("out.ifc")
-
-Extra tools
-----------
-
-Also available are a series of utilities that are based on or related to IfcOpenShell.
+Contents
+--------

 Those marked with an asterisk are part of IfcOpenShell.

-| Name                      | License             |
-| ------------------------- | ------------------- |
-| bcf                       | LGPL-3.0-or-later   |
-| blenderbim                | GPL-3.0-or-later    |
-| bsdd                      | LGPL-3.0-or-later   |
-| ifc2ca                    | LGPL-3.0-or-later   |
-| ifc4d                     | LGPL-3.0-or-later   |
-| ifc5d                     | LGPL-3.0-or-later   |
-| ifcbimtester              | LGPL-3.0-or-later   |
-| ifcblender                | LGPL-3.0-or-later\* |
-| ifccityjson               | LGPL-3.0-or-later   |
-| ifcclash                  | LGPL-3.0-or-later   |
-| ifccobie                  | LGPL-3.0-or-later   |
-| ifcconvert                | LGPL-3.0-or-later\* |
-| ifccsv                    | LGPL-3.0-or-later   |
-| ifcdiff                   | LGPL-3.0-or-later   |
-| ifcfm                     | LGPL-3.0-or-later   |
-| ifcgeom                   | LGPL-3.0-or-later\* |
-| ifcgeom\_schema\_agnostic | LGPL-3.0-or-later\* |
-| ifcgeomserver             | LGPL-3.0-or-later\* |
-| ifcjni                    | LGPL-3.0-or-later\* |
-| ifcmax                    | LGPL-3.0-or-later\* |
-| ifcopenshell-python       | LGPL-3.0-or-later\* |
-| ifcparse                  | LGPL-3.0-or-later\* |
-| ifcpatch                  | LGPL-3.0-or-later   |
-| ifcsverchok               | GPL-3.0-or-later    |
-| ifcwrap                   | LGPL-3.0-or-later\* |
-| qtviewer                  | LGPL-3.0-or-later\* |
-| serializers               | LGPL-3.0-or-later\* |
+| Name                      | Description                                                           | License             |
+| ------------------------- | ----------------------------------------------------------------------| ------------------- |
+| bcf                       | Library to read and write BCF-XML and query OpenCDE BCF-API modules   | LGPL-3.0-or-later   |
+| blenderbim                | Add-on to Blender providing a graphical native IFC authoring platform | GPL-3.0-or-later    |
+| bsdd                      | Library to query the bSDD API                                         | LGPL-3.0-or-later   |
+| ifc2ca                    | Utility to convert IFC structural analysis models to Code_Aster       | LGPL-3.0-or-later   |
+| ifc4d                     | Convert to and from IFC and project management software               | LGPL-3.0-or-later   |
+| ifc5d                     | Report and optimise cost information from IFC                         | LGPL-3.0-or-later   |
+| ifcbimtester              | Wrapper for Gherkin based unit testing for IFC models                 | LGPL-3.0-or-later   |
+| ifcblender                | Historic Blender IFC import add-on                                    | LGPL-3.0-or-later\* |
+| ifccityjson               | Convert CityJSON to IFC                                               | LGPL-3.0-or-later   |
+| ifcclash                  | Clash detection library and CLI app                                   | LGPL-3.0-or-later   |
+| ifccobie                  | Extract IFC data for COBie handover requirements                      | LGPL-3.0-or-later   |
+| ifcconvert                | CLI app to convert IFC to many other formats                          | LGPL-3.0-or-later\* |
+| ifccsv                    | Library and CLI app to export and import schedules from IFC           | LGPL-3.0-or-later   |
+| ifcdiff                   | Compare changes between IFC models                                    | LGPL-3.0-or-later   |
+| ifcfm                     | Extract IFC data for FM handover requirements                         | LGPL-3.0-or-later   |
+| ifcgeom                   | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| ifcgeom\_schema\_agnostic | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| ifcgeomserver             | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| ifcjni                    | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| ifcmax                    | Historic extension for IFC support in 3DS Max                         | LGPL-3.0-or-later\* |
+| ifcopenshell-python       | Python library for IFC manipulation                                   | LGPL-3.0-or-later\* |
+| ifcparse                  | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| ifcpatch                  | Utility to run pre-packaged scripts to manipulate IFCs                | LGPL-3.0-or-later   |
+| ifcsverchok               | Blender Add-on for visual node programming with IFC                   | GPL-3.0-or-later    |
+| ifctester                 | Library, CLI and webapp for IDS model auditing                        | LGPL-3.0-or-later   |
+| ifcwrap                   | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| qtviewer                  | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |
+| serializers               | Internal library for IfcOpenShell                                     | LGPL-3.0-or-later\* |

 [LGPL]: https://github.com/IfcOpenShell/IfcOpenShell/tree/master/COPYING.LESSER "LGPL-3.0-or-later"
 [IFC]: https://technical.buildingsmart.org/standards/ifc/ "IFC"
@@ -54,6 +54,7 @@ OPTION(USE_VLD "Use Visual Leak Detector for debugging memory leaks, MSVC-only."
 OPTION(USE_MMAP "Adds a command line options to parse IFC files from memory mapped files using Boost.Iostreams" OFF)
 OPTION(BUILD_SHARED_LIBS "Build IfcParse and IfcGeom as shared libs (SO/DLL)." OFF)
 OPTION(MSVC_PARALLEL_BUILD "Multi-threaded compilation in Microsoft Visual Studio (/MP)" OFF)
+OPTION(WASM_BUILD OFF)
 if (${HAS_MAX})
 OPTION(BUILD_IFCMAX "Build IfcMax, a 3ds Max plug-in, Windows-only." OFF)
 endif()
@@ -149,6 +150,14 @@ UNIFY_ENVVARS_AND_CACHE(MPFR_INCLUDE_DIR)
 UNIFY_ENVVARS_AND_CACHE(MPFR_LIBRARY_DIR)
 endif()

+if(WASM_BUILD)
+    # when using the nix/build-all.py build script we should not
+    # look into the sysroot for most of the dependencies but rather
+    # in the designated build/ folder created by the script.
+    set(CMAKE_FIND_ROOT_PATH_BACKUP "${CMAKE_FIND_ROOT_PATH}")
+    set(CMAKE_FIND_ROOT_PATH "")
+endif()
+
 if (NOT MINIMAL_BUILD AND GLTF_SUPPORT AND BUILD_CONVERT)
 UNIFY_ENVVARS_AND_CACHE(JSON_INCLUDE_DIR)
 FIND_FILE(json_hpp "json.hpp" ${JSON_INCLUDE_DIR}/nlohmann)
@@ -199,7 +208,14 @@ ELSE()
    ENDIF()
 ENDIF()

-set(BOOST_COMPONENTS system program_options regex thread date_time)
+if (WASM_BUILD)
+    set(BOOST_COMPONENTS)
+else()
+    # @todo review this, shouldn't this be all possible header-only now?
+    # ... or rewritten using C++17 features?
+    set(BOOST_COMPONENTS system program_options regex thread date_time)
+endif()
+
 if(USE_MMAP)
    if(MSVC)
        # filesystem is necessary for the utf-16 wpath
@@ -210,6 +226,10 @@ if(USE_MMAP)
    add_definitions(-DUSE_MMAP)
 endif()

+FIND_PACKAGE(Boost REQUIRED COMPONENTS ${BOOST_COMPONENTS})
+MESSAGE(STATUS "Boost include files found in ${Boost_INCLUDE_DIRS}")
+MESSAGE(STATUS "Boost libraries found in ${Boost_LIBRARY_DIRS}")
+
 if (NOT MINIMAL_BUILD)
 # libxml2 is required for IFCXML (optional) and SVGFILL (mandatory)
  find_package(LibXml2 REQUIRED)
@@ -220,11 +240,6 @@ if (NOT MINIMAL_BUILD AND IFCXML_SUPPORT)
 	set(SWIG_DEFINES ${SWIG_DEFINES} -DWITH_IFCXML)
 endif()

-FIND_PACKAGE(Boost REQUIRED COMPONENTS ${BOOST_COMPONENTS})
-MESSAGE(STATUS "Boost include files found in ${Boost_INCLUDE_DIRS}")
-MESSAGE(STATUS "Boost libraries found in ${Boost_LIBRARY_DIRS}")
-
-
 # Usage:
 # set(SOME_LIRARIES foo bar)
 # add_debug_variants(SOME_LIRARIES "${SOME_LIRARIES}" d)
@@ -343,10 +358,21 @@ if("${libTKernelExt}" STREQUAL ".a")
    set(OCCT_STATIC ON)
 endif()

+if(WASM_BUILD)
+    set(CMAKE_FIND_ROOT_PATH "${CMAKE_FIND_ROOT_PATH_BACKUP}")
+endif()
+
 if(OCCT_STATIC)
    find_package(Threads)
-    # OPENCASCADE_LIBRARIES repeated three times below in order to fix cyclic dependencies - use --start-group ... --end-group instead?
-    set(OPENCASCADE_LIBRARIES ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+    
+    if(WASM_BUILD)
+        set(OPENCASCADE_LIBRARIES ${OPENCASCADE_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+    else()
+        # OPENCASCADE_LIBRARIES repeated N times below in order to fix cyclic dependencies - use --start-group ... --end-group instead?
+        # tfk: --start-group ... --end-group didn't work on the apple linker when last tested
+        set(OPENCASCADE_LIBRARIES ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${OPENCASCADE_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+    endif()
+    
    if (NOT APPLE AND NOT WIN32)
        set(OPENCASCADE_LIBRARIES ${OPENCASCADE_LIBRARIES} "rt")
    endif()
@@ -620,7 +646,12 @@ function(files_for_ifc_version IFC_VERSION RESULT_NAME)
 endfunction()

 if(NOT SCHEMA_VERSIONS)
-    set(SCHEMA_VERSIONS "2x3" "4" "4x1" "4x2" "4x3_rc1" "4x3_rc2" "4x3_rc3" "4x3_rc4" "4x3")
+    if(WASM_BUILD)
+        # super arbitrarily try to keep size down at least a little bit
+        set(SCHEMA_VERSIONS "2x3" "4")
+    else()
+        set(SCHEMA_VERSIONS "2x3" "4" "4x1" "4x2" "4x3_rc1" "4x3_rc2" "4x3_rc3" "4x3_rc4" "4x3" "4x3_tc1" "4x3_add1")
+    endif()
 endif()

 foreach(s ${SCHEMA_VERSIONS})
@@ -697,7 +728,11 @@ if (BUILD_IFCGEOM)
 	foreach(s ${SCHEMA_VERSIONS})
 		set(IFCGEOM_SCHEMA_LIBRARIES ${IFCGEOM_SCHEMA_LIBRARIES} IfcGeom_ifc${s})
 	endforeach()
-	set(IFCOPENSHELL_LIBRARIES ${IFCOPENSHELL_LIBRARIES} IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES} IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES})
+	if (WASM_BUILD)
+	    set(IFCOPENSHELL_LIBRARIES ${IFCOPENSHELL_LIBRARIES} IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES})
+	else()
+	    set(IFCOPENSHELL_LIBRARIES ${IFCOPENSHELL_LIBRARIES} IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES} IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES})	
+	endif()
 endif()
 if (BUILD_CONVERT OR BUILD_IFCPYTHON)
 	foreach(s ${SCHEMA_VERSIONS})
@@ -741,7 +776,11 @@ set(IFCPARSE_FILES ${IFCPARSE_CPP_FILES} ${IFCPARSE_H_FILES})
 add_library(IfcParse ${IFCPARSE_FILES})
 set_target_properties(IfcParse PROPERTIES COMPILE_FLAGS -DIFC_PARSE_EXPORTS VERSION "0.6.0" SOVERSION "0.6")

-TARGET_LINK_LIBRARIES(IfcParse ${Boost_LIBRARIES} ${BCRYPT_LIBRARIES} ${LIBXML2_LIBRARIES})
+if (WASM_BUILD)
+    TARGET_LINK_LIBRARIES(IfcParse ${BCRYPT_LIBRARIES} ${LIBXML2_LIBRARIES})
+else()
+    TARGET_LINK_LIBRARIES(IfcParse ${Boost_LIBRARIES} ${BCRYPT_LIBRARIES} ${LIBXML2_LIBRARIES})
+endif()

 if (BUILD_IFCGEOM)

@@ -753,7 +792,9 @@ set(IFCGEOM_FILES ${IFCGEOM_CPP_FILES} ${IFCGEOM_H_FILES})
 foreach(s ${SCHEMA_VERSIONS})
 	add_library(IfcGeom_ifc${s} STATIC ${IFCGEOM_FILES})
 	set_target_properties(IfcGeom_ifc${s} PROPERTIES COMPILE_FLAGS "-DIFC_GEOM_EXPORTS -DIfcSchema=Ifc${s}")
-	TARGET_LINK_LIBRARIES(IfcGeom_ifc${s} IfcParse ${OPENCASCADE_LIBRARIES})
+	if (NOT WASM_BUILD)
+	    TARGET_LINK_LIBRARIES(IfcGeom_ifc${s} IfcParse ${OPENCASCADE_LIBRARIES})	    
+	endif()
 endforeach()

 # IfcGeom (schema agnostic)
@@ -768,7 +809,11 @@ if (UNIX)
 find_package(Threads)
 endif()

-TARGET_LINK_LIBRARIES(IfcGeom IfcParse ${IFCGEOM_SCHEMA_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+if (WASM_BUILD)
+    TARGET_LINK_LIBRARIES(IfcGeom ${IFCGEOM_SCHEMA_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+else()
+    TARGET_LINK_LIBRARIES(IfcGeom IfcParse ${IFCGEOM_SCHEMA_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+endif()

 endif(BUILD_IFCGEOM)

@@ -785,7 +830,12 @@ set(SERIALIZERS_S_FILES ${SERIALIZERS_S_H_FILES} ${SERIALIZERS_S_CPP_FILES})
 foreach(s ${SCHEMA_VERSIONS})
 	add_library(Serializers_ifc${s} STATIC ${SERIALIZERS_S_FILES})
 	set_target_properties(Serializers_ifc${s} PROPERTIES COMPILE_FLAGS "-DIFC_GEOM_EXPORTS -DIfcSchema=Ifc${s} ${CONVERT_PRECISION}")
-	TARGET_LINK_LIBRARIES(Serializers_ifc${s} IfcGeom ${OPENCASCADE_LIBRARIES} ${HDF5_LIBRARIES})
+	
+	if (WASM_BUILD)
+	    TARGET_LINK_LIBRARIES(Serializers_ifc${s} ${HDF5_LIBRARIES})
+	else()
+	    TARGET_LINK_LIBRARIES(Serializers_ifc${s} IfcGeom ${OPENCASCADE_LIBRARIES} ${HDF5_LIBRARIES})
+	endif()
 endforeach()

 add_library(Serializers ${SERIALIZERS_FILES})
@@ -41,4 +41,4 @@ cmake -G Ninja \

 ninja

-ninja install
+ninja install -j 2
@@ -13,6 +13,7 @@ source:

 build:
  binary_relocation: false [osx]
+  number: 1

 requirements:
  build:
@@ -24,7 +25,7 @@ requirements:

  host:
    - python
-    - boost-cpp <=1.74.0
+    - boost-cpp
    - occt
    - libxml2
    - cgal-cpp
@@ -36,7 +37,7 @@ requirements:

  run:
    - python
-    - boost-cpp <=1.74.0
+    - boost-cpp
    - occt
    - libxml2
    - cgal-cpp
@@ -26,7 +26,7 @@
 #     * cmake * git * bzip2 * tar * c(++) compilers * autoconf                #
 #                                                                             #
 #   if building with USE_OCCT additionally:                                   #
-#     * freetype * glx.h                                                      #
+#     * glx.h                                                                 #
 #                                                                             #
 #   if building with OCCT 7.4.0 additionally:                                 #
 #     * libfontconfig1-dev                                                    #
@@ -39,14 +39,14 @@
 #                                                                             #
 #     on debian 7.8 these can be obtained with:                               #
 #          $ apt-get install git gcc g++ autoconf bison bzip2 cmake           #
-#            libfreetype6-dev mesa-common-dev libffi-dev libfontconfig1-dev   #
+#            mesa-common-dev libffi-dev libfontconfig1-dev                    #
 #                                                                             #
 #     on ubuntu 14.04:                                                        #
 #          $ apt-get install git gcc g++ autoconf bison make cmake            #
-#            libfreetype6-dev mesa-common-dev libffi-dev libfontconfig1-dev   #
+#            mesa-common-dev libffi-dev libfontconfig1-dev                    #
 #                                                                             #
 #     on OS X El Capitan with homebrew:                                       #
-#          $ brew install git bison autoconf automake freetype libffi cmake   #
+#          $ brew install git bison autoconf automake libffi cmake            #
 #                                                                             #
 ###############################################################################
 import logging
@@ -72,11 +72,11 @@ PROJECT_NAME = "IfcOpenShell"
 USE_CURRENT_PYTHON_VERSION = os.getenv("USE_CURRENT_PYTHON_VERSION")
 ADD_COMMIT_SHA = os.getenv("ADD_COMMIT_SHA")

-PYTHON_VERSIONS = ["3.6.14", "3.7.13", "3.8.13", "3.9.11", "3.10.3"]
+PYTHON_VERSIONS = ["3.6.14", "3.7.13", "3.8.13", "3.9.11", "3.10.3", "3.11.0"]
 JSON_VERSION = "v3.6.1"
 OCE_VERSION = "0.18.3"
 OCCT_VERSION = "7.5.3"
-BOOST_VERSION = "1.71.0"
+BOOST_VERSION = "1.80.0"
 PCRE_VERSION = "8.41"
 LIBXML2_VERSION = "2.9.11"
 SWIG_VERSION = "4.0.2"
@@ -103,6 +103,9 @@ curl = "curl"
 wget = "wget"
 strip = "strip"

+explicit_targets = [s for s in sys.argv[1:] if not s.startswith("-")]
+flags = set(s.lstrip('-') for s in sys.argv[1:] if s.startswith("-"))
+
 # Helper function for coloured printing

 NO_COLOR = "\033[0m" # <ref>http://stackoverflow.com/questions/5947742/how-to-change-the-output-color-of-echo-in-linux</ref>
@@ -135,9 +138,11 @@ if platform.system() == "Darwin":

 IFCOS_NUM_BUILD_PROCS = os.getenv("IFCOS_NUM_BUILD_PROCS", multiprocessing.cpu_count() + 1)

-CMAKE_DIR = os.path.realpath(os.path.join("..", "cmake"))
+CMAKE_DIR = os.path.realpath(os.path.join(os.path.dirname(__file__), "..", "cmake"))

-path = ["..", "build", platform.system(), platform.machine()]
+build_dir = os.environ.get("BUILD_DIR", os.path.join(os.path.dirname(__file__), "..", "build"))
+
+path = [build_dir, platform.system(), "wasm" if "wasm" in flags else platform.machine()]
 if TOOLSET:
    path.append(TOOLSET)
 DEFAULT_DEPS_DIR = os.path.realpath(os.path.join(*path))
@@ -186,11 +191,12 @@ dependency_tree = {
    'boost': (),
    'libxml2': (),
    'python': (),
-    'occ': (),
+    'occ': ('freetype',),
    'pcre': (),
    'json': (),
    'hdf5': (),
-    'cgal': ()
+    'cgal': (),
+    'freetype': (),
 }

 def v(dep):
@@ -199,10 +205,12 @@ def v(dep):
     for x in v(d):
       yield x

-tgts = [s for s in sys.argv[1:] if not s.startswith("-")]
-flags = set(s for s in sys.argv[1:] if s.startswith("-"))
+if "v" in flags:
+    logger.setLevel(logging.DEBUG)
+else:
+    logger.setLevel(logging.INFO)

-BUILD_STATIC = not "-shared" in flags
+BUILD_STATIC = "shared" not in flags
 ENABLE_FLAG = "--enable-static" if BUILD_STATIC else "--enable-shared"
 DISABLE_FLAG = "--disable-shared" if BUILD_STATIC else "--disable-static"
 LINK_TYPE = "static" if BUILD_STATIC else "shared"
@@ -210,10 +218,15 @@ LINK_TYPE_UCFIRST = LINK_TYPE[0].upper() + LINK_TYPE[1:]
 LIBRARY_EXT = "a" if BUILD_STATIC else "so"
 PIC = "-fPIC" if BUILD_STATIC else ""

-if len(tgts):
-    targets = set(sum((list(v(target)) for target in tgts), []))
+if any(f.startswith("py-") for f in flags):
+    PYTHON_VERSIONS = [pyv for pyv in PYTHON_VERSIONS if "py-%s" % "".join(pyv.split('.')[0:2]) in flags]
+
+if len(explicit_targets):
+    targets = set(sum((list(v(target)) for target in explicit_targets), []))
 else:
    targets = set(dependency_tree.keys())
+    
+targets = set(t for t in targets if 'without-%s' % t.lower() not in flags)

 print("Building:", *sorted(targets, key=lambda t: len(list(v(t)))))

@@ -237,7 +250,7 @@ if not os.path.exists(LOG_FILE):
    open(LOG_FILE, "w").close()
 logger.info(f"using command log file '{LOG_FILE}'")

-def run(cmds, cwd=None):
+def run(cmds, cwd=None, can_fail=False):

    """
    Wraps `subprocess.Popen.communicate()` and logs the command being executed,
@@ -254,7 +267,7 @@ def run(cmds, cwd=None):
    log_file_handle.close()
    logger.debug(f"command returned {proc.returncode}")

-    if proc.returncode != 0:
+    if proc.returncode != 0 and not can_fail:
        print("-" * 70)
        print(stderr)
        print("-" * 70)
@@ -266,6 +279,9 @@ if platform.system() == "Darwin":
    if run(["sw_vers", "-productVersion"]) >= "11.":
        # Apparently not supported
        PYTHON_VERSIONS = [pv for pv in PYTHON_VERSIONS if tuple(map(int, pv.split("."))) >= (3, 7)]
+    if run(["sw_vers", "-productVersion"]) < "10.16":
+        # Apparently not supported
+        PYTHON_VERSIONS = [pv for pv in PYTHON_VERSIONS if tuple(map(int, pv.split("."))) < (3, 11)]

 BOOST_VERSION_UNDERSCORE = BOOST_VERSION.replace(".", "_")

@@ -281,7 +297,12 @@ def run_autoconf(arg1, configure_args, cwd):
        run([bash, "./autogen.sh"], cwd=os.path.realpath(os.path.join(cwd, ".."))) # only run autogen.sh in the directory it is located and use cwd to achieve that in order to not mess up things
    # Using `sh` over `bash` fixes issues with building swig 
    prefix = os.path.realpath(f"{DEPS_DIR}/install/{arg1}")
-    run(["/bin/sh", "../configure"] + configure_args + [f"--prefix={prefix}"], cwd=cwd)
+
+    wasm = []
+    if "wasm" in flags:
+        wasm.append("emconfigure")
+
+    run([*wasm, "/bin/sh", "../configure"] + configure_args + [f"--prefix={prefix}"], cwd=cwd)


 def run_cmake(arg1, cmake_args, cmake_dir=None, cwd=None):
@@ -289,7 +310,12 @@ def run_cmake(arg1, cmake_args, cmake_dir=None, cwd=None):
        P = ".."
    else:
        P = cmake_dir
-    run(["cmake", P] + cmake_args + [f"-DCMAKE_BUILD_TYPE={BUILD_CFG}"], cwd=cwd)
+        
+    wasm = []
+    if "wasm" in flags:
+        wasm.append("emcmake")
+        
+    run([*wasm, "cmake", P, *cmake_args, f"-DCMAKE_BUILD_TYPE={BUILD_CFG}"], cwd=cwd)


 def git_clone_or_pull_repository(clone_url, target_dir, revision=None):
@@ -371,12 +397,15 @@ def build_dependency(name, mode, build_tool_args, download_url, download_name, d
            urlretrieve(url, os.path.join(extract_dir, path))
            
    if patch is not None:
-        patch_abs = os.path.abspath(os.path.join(os.path.dirname(__file__), patch))
-        if os.path.exists(patch_abs):
-            try: run(["patch", "-p1", "--batch", "--forward", "-i", patch_abs], cwd=extract_dir)
-            except Exception as e:
-                # Assert that the patch has already been applied
-                run(["patch", "-p1", "--batch", "--reverse", "--dry-run", "-i", patch_abs], cwd=extract_dir)
+        if isinstance(patch, str):
+            patch = [patch]
+        for p in patch:
+            patch_abs = os.path.abspath(os.path.join(os.path.dirname(__file__), p))
+            if os.path.exists(patch_abs):
+                try: run(["patch", "-p1", "--batch", "--forward", "-i", patch_abs], cwd=extract_dir)
+                except Exception as e:
+                    # Assert that the patch has already been applied
+                    run(["patch", "-p1", "--batch", "--reverse", "--dry-run", "-i", patch_abs], cwd=extract_dir)
    
    if mode == "ctest":
        run(["ctest", "-S", "HDF5config.cmake,BUILD_GENERATOR=Unix", "-C", BUILD_CFG, "-V", "-O", "hdf5.log"], cwd=extract_dir)
@@ -407,7 +436,7 @@ def build_dependency(name, mode, build_tool_args, download_url, download_name, d
        logger.info(f"\rConfiguring {name}...")
        run([bash, "./bootstrap.sh"], cwd=extract_dir)
        logger.info(f"\rBuilding {name}...   ")
-        run(["./b2", f"-j{IFCOS_NUM_BUILD_PROCS}"] + build_tool_args, cwd=extract_dir)
+        run(["./b2", f"-j{IFCOS_NUM_BUILD_PROCS}"] + build_tool_args, cwd=extract_dir, can_fail="wasm" in flags)
        logger.info(f"\rInstalling {name}... ")
        shutil.copytree(os.path.join(extract_dir, "boost"), os.path.join(DEPS_DIR, "install", f"boost-{BOOST_VERSION}", "boost"))
        logger.info(f"\rInstalled {name}     \n")
@@ -418,11 +447,13 @@ cecho("Collecting dependencies:", GREEN)
 # TODO: This is untested

 ADDITIONAL_ARGS = []
-BOOST_ADDRESS_MODEL = []

 if platform.system() == "Darwin":
    ADDITIONAL_ARGS = [f"-mmacosx-version-min={TOOLSET}"] + ADDITIONAL_ARGS

+if "wasm" in flags:
+    ADDITIONAL_ARGS.extend(("-sWASM_BIGINT", "-fexceptions"))
+
 # If the linker supports GC sections, set it up to reduce binary file size
 # -fPIC is required for the shared libraries to work

@@ -431,7 +462,7 @@ CFLAGS = os.environ.get("CFLAGS", "")
 LDFLAGS = os.environ.get("LDFLAGS", "")

 ADDITIONAL_ARGS_STR = " ".join(ADDITIONAL_ARGS)
-if sp.call([bash, "-c", "ld --gc-sections 2>&1 | grep -- --gc-sections &> /dev/null"]) != 0:
+if "wasm" not in flags and sp.call([bash, "-c", "ld --gc-sections 2>&1 | grep -- --gc-sections &> /dev/null"]) != 0:
    CXXFLAGS_MINIMAL = f"{CXXFLAGS} {PIC} {ADDITIONAL_ARGS_STR}"
    CFLAGS_MINIMAL = f"{CFLAGS} {PIC} {ADDITIONAL_ARGS_STR}"
    if BUILD_STATIC:
@@ -501,8 +532,27 @@ if "swig" in targets:
        download_tool=download_tool_git,
        revision=f"rel-{SWIG_VERSION}"
    )
+    
+if "freetype" in targets:
+    build_dependency(
+        name=f"freetype",
+        mode="cmake",
+        build_tool_args=[
+            f"-DCMAKE_INSTALL_PREFIX={DEPS_DIR}/install/freetype"
+        ],
+        download_url = "https://github.com/freetype/freetype",
+        download_name = "freetype2",
+        download_tool=download_tool_git,
+    )

 if USE_OCCT and "occ" in targets:
+    patches = []
+    if OCCT_VERSION < "7.4":
+        patches.append("./patches/occt/enable-exception-handling.patch")
+    
+    if "wasm" in flags:
+        patches.append("./patches/occt/no_em_js.patch")
+
    build_dependency(
        name=f"occt-{OCCT_VERSION}",
        mode="cmake",
@@ -510,12 +560,13 @@ if USE_OCCT and "occ" in targets:
            f"-DINSTALL_DIR={DEPS_DIR}/install/occt-{OCCT_VERSION}",
            f"-DBUILD_LIBRARY_TYPE={LINK_TYPE_UCFIRST}",
            "-DBUILD_MODULE_Draw=0",
-            "-DBUILD_RELEASE_DISABLE_EXCEPTIONS=Off"
+            "-DBUILD_RELEASE_DISABLE_EXCEPTIONS=Off",
+            f"-D3RDPARTY_FREETYPE_DIR={DEPS_DIR}/install/freetype"
        ],
        download_url = "https://github.com/Open-Cascade-SAS/OCCT",
        download_name = "occt",
        download_tool=download_tool_git,
-        patch=None if OCCT_VERSION >= "7.4" else "./patches/occt/enable-exception-handling.patch",
+        patch=patches,
        revision="V" + OCCT_VERSION.replace('.', '_')
    )
 elif "occ" in targets:
@@ -552,6 +603,15 @@ if "libxml2" in targets:
    )
    
 if "OpenCOLLADA" in targets:
+    patches = ["./patches/opencollada/pr622_and_disable_subdirs.patch"]
+
+    if "wasm" in flags:
+        # This is necessary for the WASM build, because recent versions of
+        # clang don't have the tr1:: namespace anymore. However, it breaks
+        # some versions of gcc (9.4.0 at least) due to specializing std::hash
+        # outside of the std:: namespace.
+        patches.append("./patches/opencollada/remove_tr1.patch")
+
    build_dependency(
        "OpenCOLLADA",
        "cmake",
@@ -566,11 +626,11 @@ if "OpenCOLLADA" in targets:
        download_url="https://github.com/KhronosGroup/OpenCOLLADA.git",
        download_name="OpenCOLLADA",
        download_tool=download_tool_git,
-        patch="./patches/opencollada/pr622_and_disable_subdirs.patch",
+        patch=patches,
        revision=OPENCOLLADA_VERSION
    )

-if "python" in targets and not USE_CURRENT_PYTHON_VERSION:
+if "python" in targets and not USE_CURRENT_PYTHON_VERSION and "wasm" not in flags:
    # Python should not be built with -fvisibility=hidden, from experience that introduces segfaults
    OLD_CXX_FLAGS = os.environ["CXXFLAGS"]
    OLD_C_FLAGS = os.environ["CFLAGS"]
@@ -609,6 +669,9 @@ if "python" in targets and not USE_CURRENT_PYTHON_VERSION:

 if "boost" in targets:
    str_concat = lambda prefix: lambda postfix: "" if postfix.strip() == "" else "=".join((prefix, postfix.strip()))
+    toolset = []
+    if "wasm" in flags:
+        toolset.append("toolset=emscripten")
    build_dependency(
        f"boost-{BOOST_VERSION}",
        mode="bjam",
@@ -620,21 +683,30 @@ if "boost" in targets:
            "--with-thread",
            "--with-date_time",
            "--with-iostreams",
-            f"link={LINK_TYPE}"
-                                                                         ] + \
-            BOOST_ADDRESS_MODEL                                            + \
-            list(map(str_concat("cxxflags"), CXXFLAGS.strip().split(' '))) + \
-            list(map(str_concat("linkflags"), LDFLAGS.strip().split(' '))) + \
-            ["stage", "-s", "NO_BZIP2=1"],
+            f"link={LINK_TYPE}",
+            *toolset,
+            *map(str_concat("cxxflags"), CXXFLAGS.strip().split(' ')),
+            *map(str_concat("linkflags"), LDFLAGS.strip().split(' ')),
+            "stage", "-s", "NO_BZIP2=1"],
        download_url=BOOST_LOCATION,
+        patch="./patches/boost/boostorg_regex_62.patch",
        download_name=f"boost_{BOOST_VERSION_UNDERSCORE}.tar.bz2"
    )
+    if "wasm" in flags:
+        # only supported on nix for now
+        run(("find", ".", "-name", "*.bc", "-exec", "bash", "-c", "emar q ${1%.bc}.a $1", "bash", "{}", ";"), cwd=f"{DEPS_DIR}/install/boost-{BOOST_VERSION}/lib")
    
 if "cgal" in targets:
+    gmp_args = []
+    mpfr_args = []
+    if "wasm" in flags:
+        gmp_args.extend(("--disable-assembly", "--host", "none", "--enable-cxx"))
+        mpfr_args.extend(("--host", "none"))
+
    build_dependency(
        name=f"gmp-{GMP_VERSION}",
        mode="autoconf",
-        build_tool_args=[ENABLE_FLAG, DISABLE_FLAG, "--with-pic"],
+        build_tool_args=[ENABLE_FLAG, DISABLE_FLAG, "--with-pic", *gmp_args],
        download_url="https://ftp.gnu.org/gnu/gmp/",
        download_name=f"gmp-{GMP_VERSION}.tar.bz2"
    )
@@ -642,7 +714,7 @@ if "cgal" in targets:
    build_dependency(
        name=f"mpfr-{MPFR_VERSION}",
        mode="autoconf",
-        build_tool_args=[ENABLE_FLAG, DISABLE_FLAG, f"--with-gmp={DEPS_DIR}/install/gmp-{GMP_VERSION}"],
+        build_tool_args=[ENABLE_FLAG, DISABLE_FLAG, *mpfr_args, f"--with-gmp={DEPS_DIR}/install/gmp-{GMP_VERSION}"],
        download_url=f"http://www.mpfr.org/mpfr-{MPFR_VERSION}/",
        download_name=f"mpfr-{MPFR_VERSION}.tar.bz2"
    )
@@ -676,18 +748,8 @@ os.makedirs(IFCOS_DIR, exist_ok=True)
 executables_dir = os.path.join(IFCOS_DIR, "executables")
 os.makedirs(executables_dir, exist_ok=True)

-logger.info("\rConfiguring executables...")
-
 OFF_ON = ["OFF", "ON"]

-exec_args = [
-    "-DBUILD_IFCGEOM="                 +OFF_ON["IfcGeom" in targets],
-    "-DBUILD_GEOMSERVER="              +OFF_ON["IfcGeomServer" in targets],
-    "-DBUILD_CONVERT="                 +OFF_ON["IfcConvert" in targets],
-    "-DBUILD_IFCPYTHON="               "OFF",
-    "-DCMAKE_INSTALL_PREFIX="          f"{DEPS_DIR}/install/ifcopenshell",
-]
-
 cmake_args = [
    "-DUSE_MMAP="                      "OFF",
    "-DBUILD_EXAMPLES="                "OFF",
@@ -699,6 +761,11 @@ cmake_args = [
    "-DADD_COMMIT_SHA="              +("On" if ADD_COMMIT_SHA else "Off")
 ]

+if "wasm" in flags:
+    # Boost is built by the build script so should not be found
+    # inside of the sysroot set by the emscriptem toolchain
+    cmake_args.append("-DWASM_BUILD=On")
+
 if "cgal" in targets:
    cmake_args.extend([
        "-DCGAL_INCLUDE_DIR="          f"{DEPS_DIR}/install/cgal-{CGAL_VERSION}/include",
@@ -750,20 +817,36 @@ if "hdf5" in targets:
        "-DHDF5_INCLUDE_DIR="          f"{DEPS_DIR}/install/hdf5-{HDF5_VERSION}/include",
        "-DHDF5_LIBRARY_DIR="          f"{DEPS_DIR}/install/hdf5-{HDF5_VERSION}/lib"
    ])
+else:
+    cmake_args.append("-DHDF5_SUPPORT=Off")

-run_cmake("", exec_args + cmake_args, cmake_dir=CMAKE_DIR, cwd=executables_dir)
+if not explicit_targets or {"IfcGeom", "IfcConvert", "IfcGeomServer"} & set(explicit_targets):
+    logger.info("\rConfiguring executables...")

-logger.info("\rBuilding executables...   ")
+    exec_args = [
+        "-DBUILD_IFCGEOM="                 +OFF_ON["IfcGeom" in targets],
+        "-DBUILD_GEOMSERVER="              +OFF_ON["IfcGeomServer" in targets],
+        "-DBUILD_CONVERT="                 +OFF_ON["IfcConvert" in targets],
+        "-DBUILD_IFCPYTHON="               "OFF",
+        "-DCMAKE_INSTALL_PREFIX="          f"{DEPS_DIR}/install/ifcopenshell",
+    ]
+    
+    run_cmake("", exec_args + cmake_args, cmake_dir=CMAKE_DIR, cwd=executables_dir)

-run([make, f"-j{IFCOS_NUM_BUILD_PROCS}"], cwd=executables_dir)
-run([make, "install/strip" if BUILD_CFG == "Release" else "install"], cwd=executables_dir)
+    logger.info("\rBuilding executables...   ")
+
+    run([make, f"-j{IFCOS_NUM_BUILD_PROCS}"], cwd=executables_dir)
+    run([make, "install/strip" if BUILD_CFG == "Release" else "install"], cwd=executables_dir)

 if "IfcOpenShell-Python" in targets:
    # On OSX the actual Python library is not linked against.
    ADDITIONAL_ARGS = ""
    if platform.system() == "Darwin":
        ADDITIONAL_ARGS = "-Wl,-flat_namespace,-undefined,suppress"
-
+        
+    if "wasm" in flags:
+        ADDITIONAL_ARGS = f"-Wl,-undefined,suppress -sSIDE_MODULE=2 -sEXPORTED_FUNCTIONS=_PyInit__ifcopenshell_wrapper"
+        
    os.environ["CXXFLAGS"] = f"{CXXFLAGS_MINIMAL} {ADDITIONAL_ARGS}"
    os.environ["CFLAGS"] = f"{CFLAGS_MINIMAL} {ADDITIONAL_ARGS}"
    os.environ["LDFLAGS"] = f"{LDFLAGS} {ADDITIONAL_ARGS}"
@@ -780,36 +863,57 @@ if "IfcOpenShell-Python" in targets:

        os.environ["PYTHON_LIBRARY_BASENAME"] = os.path.basename(python_library)

+        swig_when_built = []
+        if "swig" in targets:
+            swig_when_built.append(f"-DSWIG_EXECUTABLE={DEPS_DIR}/install/swig/bin/swig")
+
        run_cmake("",
            cmake_args + [
                "-DPYTHON_LIBRARY="          +python_library,
-                "-DPYTHON_EXECUTABLE="       +python_executable,
+                *([f"-DPYTHON_EXECUTABLE={python_executable}"] if python_executable else []),
+                # *([f"-DPYTHON_MODULE_INSTALL_DIR={os.environ['PYTHONPATH']}/ifcopenshell"] if "wasm" in flags else []),
+                *(["-DPYTHON_MODULE_INSTALL_DIR="+os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "package"))] if "wasm" in flags else []),
                "-DPYTHON_INCLUDE_DIR="      +python_include,
-                "-DSWIG_EXECUTABLE="         f"{DEPS_DIR}/install/swig/bin/swig",
                "-DCMAKE_INSTALL_PREFIX="    f"{DEPS_DIR}/install/ifcopenshell/tmp",
-                "-DUSERSPACE_PYTHON_PREFIX=" +["Off", "On"][os.environ.get("PYTHON_USER_SITE", "").lower() in {"1", "on", "true"}]
-            ], cmake_dir=CMAKE_DIR, cwd=python_dir)
+                "-DUSERSPACE_PYTHON_PREFIX=" +["Off", "On"][os.environ.get("PYTHON_USER_SITE", "").lower() in {"1", "on", "true"}],
+                *swig_when_built],
+            cmake_dir=CMAKE_DIR, cwd=python_dir)

        logger.info(f"\rBuilding python {python_version} wrapper...   ")

        run([make, f"-j{IFCOS_NUM_BUILD_PROCS}", "_ifcopenshell_wrapper"], cwd=python_dir)
        run([make, "install/local"], cwd=os.path.join(python_dir, "ifcwrap"))

-        module_dir = os.path.dirname(run([python_executable, "-c", "import inspect, ifcopenshell; print(inspect.getfile(ifcopenshell))"]))
+        if python_executable:
+            module_dir = os.path.dirname(run([python_executable, "-c", "import inspect, ifcopenshell; print(inspect.getfile(ifcopenshell))"]))

-        if platform.system() != "Darwin":
-            # TODO: This symbol name depends on the Python version?
-            run([strip, "-s", "-K", "PyInit__ifcopenshell_wrapper", "_ifcopenshell_wrapper.so"], cwd=module_dir)
-        return module_dir
+            if platform.system() != "Darwin":
+                # TODO: This symbol name depends on the Python version?
+                run([strip, "-s", "-K", "PyInit__ifcopenshell_wrapper", "_ifcopenshell_wrapper.so"], cwd=module_dir)

+            return module_dir

-    if USE_CURRENT_PYTHON_VERSION:
-        python_info = sysconfig.get_paths()
-        python_lib = os.path.join(
-            sysconfig.get_config_var('LIBDIR'), 
-            sysconfig.get_config_var('multiarchsubdir').replace("/", ""), 
-            sysconfig.get_config_var("INSTSONAME")
+    if "wasm" in flags:
+        compile_python_wrapper(
+            f"{os.environ['PYMAJOR']}.{os.environ['PYMINOR']}.{os.environ['PYMICRO']}",
+            f"{os.environ['TARGETINSTALLDIR']}/lib/libpython{os.environ['PYMAJOR']}.{os.environ['PYMINOR']}.a",
+            os.environ['PYTHONINCLUDE'],
+            None
        )
+    
+    elif USE_CURRENT_PYTHON_VERSION:
+        python_info = sysconfig.get_paths()
+
+        py_path_components = [
+            sysconfig.get_config_var('LIBDIR'),
+            sysconfig.get_config_var("INSTSONAME")
+        ]
+
+        if sysconfig.get_config_var('multiarchsubdir'):
+            py_path_components.insert(1, sysconfig.get_config_var('multiarchsubdir').replace("/", ""))
+
+        python_lib = os.path.join(*py_path_components)
+
        compile_python_wrapper(platform.python_version(), python_lib, python_info["include"], sys.executable)
    else:
        for python_version in PYTHON_VERSIONS:
@@ -0,0 +1,20 @@
+--- a/tools/build/src/tools/emscripten.jam
+++ b/tools/build/src/tools/emscripten.jam
+@@ -6,6 +6,7 @@
+ import feature ;
+ import os ;
+ import toolset ;
+import generators ;
+ import common ;
+ import gcc ;
+ import type ;
+@@ -52,6 +53,8 @@
+         <debug-symbols>off <debug-symbols>on
+         <rtti>off <rtti>on
+         ;
+generators.override builtin.lib-generator : emscripten.prebuilt ;
+generators.override emscripten.searched-lib-generator : searched-lib-generator ;
+ 
+ type.set-generated-target-suffix EXE : <toolset>emscripten : "js" ;
+ type.set-generated-target-suffix OBJ : <toolset>emscripten : "bc" ;
+ 
@@ -0,0 +1,99 @@
+diff --git a/src/Message/Message_PrinterSystemLog.cxx b/src/Message/Message_PrinterSystemLog.cxx
+index 0c82c2167..a2e9e6d68 100644
+--- a/src/Message/Message_PrinterSystemLog.cxx
+++ b/src/Message/Message_PrinterSystemLog.cxx
+@@ -55,27 +55,6 @@
+     return ANDROID_LOG_DEBUG;
+   }
+ #elif defined(__EMSCRIPTEN__)
+-  #include <emscripten/emscripten.h>
+-
+-  //! Print message to console.debug().
+-  EM_JS(void, occJSConsoleDebug, (const char* theStr), {
+-    console.debug(UTF8ToString(theStr));
+-  });
+-
+-  //! Print message to console.info().
+-  EM_JS(void, occJSConsoleInfo, (const char* theStr), {
+-    console.info(UTF8ToString(theStr));
+-  });
+-
+-  //! Print message to console.warn().
+-  EM_JS(void, occJSConsoleWarn, (const char* theStr), {
+-    console.warn(UTF8ToString(theStr));
+-  });
+-
+-  //! Print message to console.error().
+-  EM_JS(void, occJSConsoleError, (const char* theStr), {
+-    console.error(UTF8ToString(theStr));
+-  });
+ #else
+   #include <syslog.h>
+ 
+@@ -169,16 +148,6 @@ void Message_PrinterSystemLog::send (const TCollection_AsciiString& theString,
+ #elif defined(__ANDROID__)
+   __android_log_write (getAndroidLogPriority (theGravity), myEventSourceName.ToCString(), theString.ToCString());
+ #elif defined(__EMSCRIPTEN__)
+-  // don't use bogus emscripten_log() corrupting UNICODE strings
+-  switch (theGravity)
+-  {
+-    case Message_Trace:   occJSConsoleDebug(theString.ToCString()); return;
+-    case Message_Info:    occJSConsoleInfo (theString.ToCString()); return;
+-    case Message_Warning: occJSConsoleWarn (theString.ToCString()); return;
+-    case Message_Alarm:   occJSConsoleError(theString.ToCString()); return;
+-    case Message_Fail:    occJSConsoleError(theString.ToCString()); return;
+-  }
+-  occJSConsoleWarn (theString.ToCString());
+ #else
+   syslog (getSysLogPriority (theGravity), "%s", theString.ToCString());
+ #endif
+diff --git a/src/OSD/OSD_MemInfo.cxx b/src/OSD/OSD_MemInfo.cxx
+index 08a939beb..7c1fc79b3 100644
+--- a/src/OSD/OSD_MemInfo.cxx
+++ b/src/OSD/OSD_MemInfo.cxx
+@@ -37,15 +37,6 @@
+ 
+ #include <OSD_MemInfo.hxx>
+ 
+-#if defined(__EMSCRIPTEN__)
+-  #include <emscripten.h>
+-
+-  //! Return WebAssembly heap size in bytes.
+-  EM_JS(size_t, OSD_MemInfo_getModuleHeapLength, (), {
+-    return Module.HEAP8.length;
+-  });
+-#endif
+-
+ // =======================================================================
+ // function : OSD_MemInfo
+ // purpose  :
+@@ -156,29 +147,6 @@ void OSD_MemInfo::Update()
+   }
+ 
+ #elif defined(__EMSCRIPTEN__)
+-  if (IsActive (MemHeapUsage)
+-   || IsActive (MemWorkingSet)
+-   || IsActive (MemWorkingSetPeak))
+-  {
+-    // /proc/%d/status is not emulated - get more info from mallinfo()
+-    const struct mallinfo aMI = mallinfo();
+-    if (IsActive (MemHeapUsage))
+-    {
+-      myCounters[MemHeapUsage] = aMI.uordblks;
+-    }
+-    if (IsActive (MemWorkingSet))
+-    {
+-      myCounters[MemWorkingSet] = aMI.uordblks;
+-    }
+-    if (IsActive (MemWorkingSetPeak))
+-    {
+-      myCounters[MemWorkingSetPeak] = aMI.usmblks;
+-    }
+-  }
+-  if (IsActive (MemVirtual))
+-  {
+-    myCounters[MemVirtual] = OSD_MemInfo_getModuleHeapLength();
+-  }
+ #elif (defined(__linux__) || defined(__linux))
+   if (IsActive (MemHeapUsage))
+   {
@@ -0,0 +1,81 @@
+diff --git a/COLLADABaseUtils/include/COLLADABUhash_map.h b/COLLADABaseUtils/include/COLLADABUhash_map.h
+index 8ab0fb9b..12503bfb 100644
+--- a/COLLADABaseUtils/include/COLLADABUhash_map.h
+++ b/COLLADABaseUtils/include/COLLADABUhash_map.h
+@@ -32,9 +32,9 @@
+             #include <unordered_map>
+             #include <unordered_set>
+ 
+-            #define COLLADABU_HASH_MAP std::tr1::unordered_map
+-			#define COLLADABU_HASH_MULTIMAP std::tr1::unordered_multimap
+-            #define COLLADABU_HASH_SET std::tr1::unordered_set
+            #define COLLADABU_HASH_MAP std::unordered_map
+			#define COLLADABU_HASH_MULTIMAP std::unordered_multimap
+            #define COLLADABU_HASH_SET std::unordered_set
+             #define COLLADABU_HASH_NAMESPACE_OPEN std { namespace tr1
+             #define COLLADABU_HASH_NAMESPACE_CLOSE }
+             #define COLLADABU_HASH_FUN hash
+@@ -50,12 +50,12 @@
+             #define COLLADABU_HASH_FUN hash
+         #endif
+     #elif defined(__MINGW32__) || defined(__MINGW64__)
+-        #include <tr1/unordered_map>
+-        #include <tr1/unordered_set>
+        #include <unordered_map>
+        #include <unordered_set>
+ 
+-        #define COLLADABU_HASH_MAP std::tr1::unordered_map
+-        #define COLLADABU_HASH_MULTIMAP std::tr1::unordered_multimap
+-        #define COLLADABU_HASH_SET std::tr1::unordered_set
+        #define COLLADABU_HASH_MAP std::unordered_map
+        #define COLLADABU_HASH_MULTIMAP std::unordered_multimap
+        #define COLLADABU_HASH_SET std::unordered_set
+         #define COLLADABU_HASH_NAMESPACE_OPEN std { namespace tr1
+         #define COLLADABU_HASH_NAMESPACE_CLOSE }
+         #define COLLADABU_HASH_FUN hash
+@@ -107,12 +107,12 @@
+         #define COLLADABU_HASH_NAMESPACE_CLOSE
+         #define COLLADABU_HASH_FUN hash
+     #else
+-        #include <tr1/unordered_map>
+-        #include <tr1/unordered_set>
+        #include <unordered_map>
+        #include <unordered_set>
+ 
+-		#define COLLADABU_HASH_MAP std::tr1::unordered_map
+-		#define COLLADABU_HASH_MULTIMAP std::tr1::unordered_multimap
+-        #define COLLADABU_HASH_SET std::tr1::unordered_set
+		#define COLLADABU_HASH_MAP std::unordered_map
+		#define COLLADABU_HASH_MULTIMAP std::unordered_multimap
+        #define COLLADABU_HASH_SET std::unordered_set
+         #define COLLADABU_HASH_NAMESPACE_OPEN std { namespace tr1
+         #define COLLADABU_HASH_NAMESPACE_CLOSE }
+         #define COLLADABU_HASH_FUN hash
+diff --git a/common/libBuffer/include/CommonFWriteBufferFlusher.h b/common/libBuffer/include/CommonFWriteBufferFlusher.h
+index c7af45b2..fac4f133 100644
+--- a/common/libBuffer/include/CommonFWriteBufferFlusher.h
+++ b/common/libBuffer/include/CommonFWriteBufferFlusher.h
+@@ -15,12 +15,12 @@
+ 
+ #if (defined(WIN64) || defined(_WIN64) || defined(__WIN64__)) || (defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || defined(__APPLE__))
+ #if defined(__GNUC__) && !defined(_LIBCPP_VERSION)
+-#	include <tr1/unordered_map>
+#	include <unordered_map>
+ #else
+ #	include <unordered_map>
+ #endif
+ #else
+-#	include <tr1/unordered_map>
+#	include <unordered_map>
+ #endif
+ 
+ #ifdef _LIBCPP_VERSION
+@@ -58,7 +58,7 @@ namespace Common
+ #else
+ 		typedef __int64 FilePosType;
+ #endif
+-	typedef std::tr1::unordered_map<MarkId, FilePosType > MarkIdToFilePos;
+	typedef std::unordered_map<MarkId, FilePosType > MarkIdToFilePos;
+ 
+ 	public:
+ 		static const size_t DEFAUL_BUFFER_SIZE = 64*1024;
@@ -0,0 +1,18 @@
+package:
+  name: ifcopenshell
+  version: 0.7.0
+
+source:
+  path: IfcOpenShell
+
+build:
+  script: |
+    python nix/build-all.py --without-hdf5 --without-opencollada --without-swig --without-pcre -v --wasm --py310 IfcOpenShell-Python
+    cp pyodide/setup.py .
+
+about:
+  home: http://ifcopenshell.org
+  license: LGPL-3.0-or-later
+  summary: |
+    IfcOpenShell is an open source (LGPL) software library for 
+    working with the Industry Foundation Classes (IFC) file format.
@@ -0,0 +1,11 @@
+from setuptools import setup, find_packages
+
+setup(name='IfcOpenShell',
+      version='0.7.0',
+      description='IfcOpenShell is an open source (LGPL) software library for working with the Industry Foundation Classes (IFC) file format.',
+      author='Thomas Krijnen',
+      author_email='thomas@aecgeeks.com',
+      url='http://ifcopenshell.org',
+      packages=find_packages(),
+      package_data={'': ['*.so']},
+)
@@ -0,0 +1 @@
+.tox
@@ -0,0 +1,17 @@
+.PHONY: ci
+ci:
+	tox
+
+.PHONY: license
+license:
+	copyright-header --license LGPL3 --copyright-holder "Andrea Ghensi <andrea.ghensi@gmail.com>" --copyright-year "2022" --copyright-software "IfcOpenShell" --copyright-software-description "BCF XML file handling" -a ./ -o ./
+
+# TODO: make this based on xsd file presence
+.PHONY: models
+models:
+	cd src && xsdata generate -p bcf.v2.model --unnest-classes --kw-only --slots -ds Google bcf/v2/xsd
+	cd src && xsdata generate -p bcf.v3.model --unnest-classes --kw-only --slots -ds Google bcf/v3/xsd
+
+# .PHONY
+# api:
+#     openapi-python-client generate --url https://api.swaggerhub.com/apis/buildingSMART/BCF/3.0
@@ -1,64 +1,54 @@
 # bcf

-A simple Python implementation of BCF. The data model is described in `data.py`.
+A simple Python implementation of BCF.
 Manipulation of BCF-XML is available via `bcfxml.py` and manipulation of BCF-API
 is available via `bcfapi.py`.

- BCF-XML version 2.1: Fully supported
- BCF-API version 2.1: Not supported, will probably tackle this after BCF-API v3.0
- BCF-XML version 3.0: Almost fully supported, except for the documents module
- BCF-API version 3.0: Almost fully supported, except for two requests.
+It tries to support BCF-XML version 2.1 and 3.0, and BCF-API 3.0.

 ## bcfxml

-The `bcfxml` module lets you interact with the BCF-XML standard.
+The `bcfxml.load` function lets you read a BCF-XML file.
+It takes care of using the right version based on the "bcf.version" file contained in the BCF package.
+
+The BCF files are extracted and parsed on-demand, and edits are stored in memory until you call the `save` method.

 ```python
-from bcf import bcfxml
-
+from bcf.bcfxml import load

 # Load a project
-bcfxml = bcfxml.load("/path/to/file.bcf")
+with load("/path/to/file.bcf") as bcfxml:
+    project = bcfxml.project
+    print(project.name)

+    # To edit a project, just modify the object directly
+    bcfxml.project.name = "New name"

-# The project is also stored in the module
-# project == bcfxml.project
-project=bcfxml.get_project()
-print(project.name)
+    # Get a dictionary of topics
+    topics = bcfxml.topics

-# To edit a project, just modify the object directly
-bcfxml.project.name = "New name"
-bcfxml.edit_project()
+    for topic_guid, topic_handler in bcfxml.topics.items():
+        topic = topic_handler.topic
+        print("Topic guid is", topic.guid)
+        print("Topic title is", topic.title)

-# The BCF file is extracted to this temporary directory
-print(bcfxml.filepath)
+        # Fetch extra data about a topic
+        header = topic_handler.header
+        comments = topic_handler.comments
+        viewpoints = topic_handler.viewpoints

-# Get a dictionary of topics
-topics = bcfxml.get_topics()
+        for comment in comments:
+            print(comment.guid)
+            print(comment.comment)
+            print(comment.author)

-# Note: topics == bcfxml.topics
-for guid, topic in bcfxml.topics.items():
-    print("Topic guid is", guid)
-    print("Topic guid is", topic.guid)
-    print("Topic title is", topic.title)
+    # Get a particular topic
+    topic = bcfxml.get_topic(guid)

-    # Fetch extra data about a topic
-    header = bcfxml.get_header(guid)
-    comments = bcfxml.get_comments(guid)
-    viewpoints = bcfxml.get_viewpoints(guid)
+    # Modify a topic
+    topic.title = "New title"

-    # Note: comments == topic.comments, and so on
-    for comment_guid, comment in comments.items():
-        print(comment_guid)
-        print(comment.comment)
-        print(comment.author)
-
-# Get a particular topic
-topic = bcfxml.get_topic(guid)
-
-# Modify a topic
-topic.title = "New title"
-bcfxml.edit_topic(topic)
+    bcfxml.save()
 ```

 ## bcfapi
@@ -92,10 +82,3 @@ print(data)
 data = bcf_client.get_extensions(project_id)
 print(data)
 ```
-
-## Todo List
-
-The remaining work that needs to be completed in `bcfxml.py` and `bcfapi.py`.
-
- For `bcfxml.py` two xsds support is remaining namely 'documents.xsd`and`extensions.xsd`.
- For `bcfapi.py` two requests that are `get_topics` and `get_comments` are remaining.
@@ -1,12 +1,141 @@
 [build-system]
 requires = [
-    "setuptools>=42",
+    "setuptools>=61",
    "wheel"
 ]
 build-backend = "setuptools.build_meta"

+[project]
+name = "bcf-client"
+# author = "IfcOpenShell"
+description = "BCF-XML file handler."
+readme = "README.md"
+requires-python = ">=3.8"
+keywords = ["IFC", "BCF", "BIM", "eingineering"]
+dependencies = [
+    "xsdata",
+    "numpy",
+    "ifcopenshell",
+]
+version = "0.0.1"
+classifiers = [
+    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Topic :: Scientific/Engineering",
+    "Topic :: Utilities",
+]
+
+[project.urls]
+Source = "https://github.com/IfcOpenShell/IfcOpenShell"
+Issues = "https://github.com/IfcOpenShell/IfcOpenShell/issues"
+
 [tool.black]
 line-length = 120
+extend-exclude = "model"

 [tool.isort]
-profile = "black"
+profile = "black"
+extend_skip_glob = ["src/bcf/*/model/*"]
+
+[tool.coverage.paths]
+source = ["src"]
+
+[tool.coverage.run]
+branch = true
+source = ["bcf"]
+omit = ["*/model/*"]
+
+[tool.coverage.report]
+show_missing = true
+fail_under = 65
+exclude_lines = [
+    "pragma: no cover",
+    "if TYPE_CHECKING",
+    "if __name__ == .__main__.:",
+    "Protocol",
+]
+
+[tool.tox]
+legacy_tox_ini = """
+[tox]
+env_list = lint, type, py3{10,11}
+skip_missing_interpreters = true
+
+[testenv]
+deps =
+    pytest
+    pytest-cov
+    coverage
+commands = pytest --cov --cov-report=term tests
+
+[testenv:lint]
+description = run linters
+skip_install = true
+deps =
+    black
+    isort
+    pylint
+commands = 
+    black {posargs:.}
+    isort {posargs:.}
+    pylint {posargs:.} --output-format=colorized
+
+[testenv:type]
+description = run type checks
+deps =
+    mypy>=0.991
+commands =
+    - mypy {posargs:src}
+"""
+
+[tool.mypy]
+check_untyped_defs = true
+disallow_any_generics = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+#no_implicit_reexport = true
+show_column_numbers = true
+show_error_codes = true
+show_error_context = true
+strict_equality = true
+strict_optional = true
+warn_redundant_casts = true
+#warn_return_any = true
+warn_unreachable = true
+warn_unused_configs = true
+warn_unused_ignores = true
+exclude= "src/bcf/v(2|3)/model"
+plugins = "numpy.typing.mypy_plugin"
+
+[[tool.mypy.overrides]]
+module = "tests"
+disallow_untyped_decorators = false
+disallow_untyped_defs = false
+
+[[tool.mypy.overrides]]
+module = [
+    "pytest",
+    "pytest_mock",
+    "ifcopenshell",
+    "ifcopenshell.*",
+]
+ignore_missing_imports = true
+
+[tool.pylint.main]
+ignore = ["model"]
+ignored-modules = ["bcf.v2.model", "bcf.v3.model", "xsdata"]
+jobs = 0
+disable="all"
+enable="E" # B,B9,BLK,C,D,E,F,I,N,S,W
+
+[tool.pylint.design]
+max-args = 10
+max-attributes = 10
+
+[tool.pylint.format]
+expected-line-ending-format = "LF"
+max-line-length = 120
@@ -0,0 +1,6 @@
+black
+mypy
+pylint
+isort
+xsdata
+tox==3.27.1
@@ -1 +0,0 @@
-xmlschema
@@ -1,37 +0,0 @@
-[metadata]
-name=bcf-client
-version=0.0.1
-author = Ifcopenshell
-description = A simple Python implementation of BCF
-url = https://github.com/IfcOpenShell/IfcOpenShell
-project_urls =
-    Code=https://github.com/IfcOpenShell/IfcOpenShell
-    Issues=https://github.com/IfcOpenShell/IfcOpenShell/issues
-long_description = file: README.md
-long_description_content_type = text/markdown
-classifiers =
-    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
-    Operating System :: OS Independent
-    Programming Language :: Python :: 3
-    Topic :: Scientific/Engineering
-    Topic :: Utilities
-keywords =
-    Python
-    file formats
-    engineering
-
-[options]
-package_dir =
-    = src
-packages = find:
-python_requires = >=3
-install_requires=
-    xmlschema
-include_package_data = True
-
-[options.packages.find]
-where = src
-
-[flake8]
-max-line-length = 120
-ignore = E24, E121, E123, E126, E203, E226, E704, E741, W503, W504
@@ -0,0 +1,3 @@
+from setuptools import setup
+
+setup()
@@ -1,61 +1,73 @@
-# BCF - BCF Python library
-# Copyright (C) 2021 Prabhat Singh <singh01prabhat@gmail.com>
-#
-# This file is part of BCF.
-#
-# BCF is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# BCF is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with BCF.  If not, see <http://www.gnu.org/licenses/>.
+"""
+BCF - BCF Python library
+Copyright (C) 2021 Prabhat Singh <singh01prabhat@gmail.com>
+Copyright (C) 2022 Andrea Ghensi <andrea.ghensi@gmail.com>

+This file is part of BCF.

-import os.path
+BCF is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+BCF is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with BCF.  If not, see <http://www.gnu.org/licenses/>.
+"""
 import zipfile
-import tempfile
-from xml.dom import minidom
+from pathlib import Path
+from typing import Optional, Union
+
+from bcf.v2.bcfxml import BcfXml as BcfXml2
+from bcf.v2.model import Version as Version2
+from bcf.v3.bcfxml import BcfXml as BcfXml3
+from bcf.v3.model import Version as Version3
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer


-def load(filepath):
-    filepath = extract_project(filepath)
-    if os.path.isfile(os.path.join(filepath, "bcf.version")):
-        version_path = os.path.join(filepath, "bcf.version")
-        version_id = get_version(version_path)
-        # TODO: we actually coded it for 2.1, let's check the difference between 2.0 and 2.1
-        if version_id == "2.1" or version_id == "2.0":
-            from bcf.v2.bcfxml import BcfXml
+def load(
+    filepath: Path, xml_handler: Optional[AbstractXmlParserSerializer] = None
+) -> Optional[Union[BcfXml2, BcfXml3]]:
+    """
+    Load a BCF file.

-            bcfxml = BcfXml()
-            bcfxml.filepath = filepath
-            return bcfxml
-        elif version_id == "3.0":
-            from bcf.v3.bcfxml import BcfXml
+    Args:
+        filepath: The path to the BCF file.

-            bcfxml = BcfXml()
-            bcfxml.filepath = filepath
-            return bcfxml
-        else:
-            raise Exception(f"Version {version_id} not supported.")
+    Returns:
+        The loaded BCF file.
+
+    Raises:
+        ValueError: If the BCF version is not supported.
+    """
+    xml_handler = xml_handler or XmlParserSerializer()
+    version_id = _get_version(filepath, xml_handler)
+    if version_id in {"2.1", "2.0"}:
+        return BcfXml2.load(filepath, xml_handler)
+    if version_id == "3.0":
+        return BcfXml3.load(filepath, xml_handler)
+    raise ValueError(f"Version {version_id} not supported.")


-def get_version(version_path):
-    xmlparse = minidom.parse(version_path)
-    version_el = xmlparse.getElementsByTagName("Version")[0]
-    version = version_el.getAttribute("VersionId")
-    return version
+def _get_version(filepath: Union[str, Path], xml_handler: Optional[AbstractXmlParserSerializer] = None) -> str:
+    """
+    Returns the version of the BCF file.

+    Args:
+        filepath: The path to the BCF file.
+        xml_handler: The XML handler. If none is given, XmlParserSerializer is used.

-def extract_project(filepath):
-    if not filepath:
-        return
-    zip_file = zipfile.ZipFile(filepath)
-    filepath = tempfile.mkdtemp()
-    zip_file.extractall(filepath)
-    return filepath
+    Returns:
+        The version of the BCF file.
+    """
+    xml_handler = xml_handler or XmlParserSerializer()
+    with zipfile.ZipFile(filepath) as bcf_zip:
+        try:
+            version = xml_handler.parse(bcf_zip.read("bcf.version"), Version3)
+        except:
+            version = xml_handler.parse(bcf_zip.read("bcf.version"), Version2)
+        return version.version_id
@@ -0,0 +1,64 @@
+from typing import Optional
+
+import numpy as np
+from numpy.typing import NDArray
+
+
+def camera_vectors_from_element_placement(
+    elem_placement: NDArray[np.float_],
+) -> tuple[NDArray[np.float_], NDArray[np.float_], NDArray[np.float_]]:
+    """
+    Calculate the vectors of a camera pointing to an element.
+
+    Args:
+        elem_placement: Placement matrix of an element.
+
+    Returns:
+        Camera position, direction and up vectors
+    """
+    target_position = elem_placement[:3, 3]
+    return camera_vectors_from_target_position(target_position)
+
+
+def camera_vectors_from_target_position(
+    target_position: NDArray[np.float_], offset: Optional[NDArray[np.float_]] = None
+) -> tuple[NDArray[np.float_], NDArray[np.float_], NDArray[np.float_]]:
+    """
+    Calculate the vectors of a camera pointing to a target point.
+
+    Args:
+        target_position: point the camera is pointing to.
+        camera_offset: offset of the camera from the target point.
+
+    Returns:
+        Camera position, direction and up vectors
+    """
+    camera_offset = np.array((5, 5, 5)) if offset is None else offset
+    camera_position = target_position + camera_offset
+    camera_direction = unit_vector(-camera_offset)  # pylint: disable=invalid-unary-operand-type
+    camera_right = unit_vector(np.cross(np.array([0.0, 0.0, 1.0]), camera_direction))
+    camera_up = unit_vector(np.cross(camera_direction, camera_right))
+    return camera_position, camera_direction, camera_up
+    # rotation_transform = np.eye(4)
+    # rotation_transform[0, :3] = camera_right
+    # rotation_transform[1, :3] = camera_up
+    # rotation_transform[2, :3] = camera_direction
+    # translation_transform = np.eye(4)
+    # translation_transform[:3, -1] = -camera_position
+    # look_at_transform = np.matmul(rotation_transform, translation_transform)
+    # mat = np.linalg.inv(look_at_transform)
+    # return camera_position, -mat[:3, 2], mat[:3, 1]
+
+
+def unit_vector(v: NDArray[np.float_]) -> NDArray[np.float_]:
+    """
+    Return the unit vector of a vector.
+
+    Args:
+        v: vector
+
+    Returns:
+        unit vector.
+    """
+    norm = np.linalg.norm(v)
+    return v if norm == 0 else v / norm
@@ -0,0 +1,55 @@
+"""
+In Memory Zip File management, taken from ruamel.std.zipfile
+
+Copyright (c) 2017-2020 Anthon van der Neut, Ruamel bvba
+
+original idea from https://stackoverflow.com/a/19722365/1307905
+"""
+import zipfile
+from io import BytesIO
+from os import PathLike
+from pathlib import Path
+from typing import Any, Optional, Protocol
+
+
+class ZipFileInterface(Protocol):
+    def writestr(self, filename_in_zip: str | zipfile.ZipInfo, file_contents: bytes | str) -> None:
+        ...
+
+
+class InMemoryZipFile:
+    def __init__(
+        self, file_name: Optional[str | Path] = None, compression: int = zipfile.ZIP_DEFLATED, debug: int = 0
+    ) -> None:
+        # Create the in-memory file-like object
+        self._file_name: Optional[str | Path] = str(file_name) if hasattr(file_name, "_from_parts") else file_name
+        self.in_memory_data = BytesIO()
+        # Create the in-memory zipfile
+        self.in_memory_zip = zipfile.ZipFile(self.in_memory_data, "w", compression, False)
+        self.in_memory_zip.debug = debug
+
+    def writestr(self, filename_in_zip: str | zipfile.ZipInfo, file_contents: bytes | str) -> None:
+        """Appends a file with name filename_in_zip and contents of
+        file_contents to the in-memory zip."""
+        self.in_memory_zip.writestr(filename_in_zip, file_contents)
+
+    def write_to_file(self, filename: str | bytes | PathLike[str] | PathLike[bytes] | int) -> None:
+        """Writes the in-memory zip to a file."""
+        # Mark the files as having been created on Windows so that
+        # Unix permissions are not inferred as 0000
+        for zfile in self.in_memory_zip.filelist:
+            zfile.create_system = 0
+        self.in_memory_zip.close()
+        with open(filename, "wb") as f:
+            f.write(self.data)
+
+    @property
+    def data(self) -> bytes:
+        return self.in_memory_data.getvalue()
+
+    def __enter__(self) -> "InMemoryZipFile":
+        return self
+
+    def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
+        if self._file_name:
+            self.write_to_file(self._file_name)
@@ -1,4 +1,3 @@
-
 # BCF - BCF Python library
 # Copyright (C) 2020, 2021 Dion Moult <dion@thinkmoult.com>
 #
@@ -16,4 +15,3 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with BCF.  If not, see <http://www.gnu.org/licenses/>.
-
@@ -1,198 +0,0 @@
-
-# BCF - BCF Python library
-# Copyright (C) 2020, 2021 Dion Moult <dion@thinkmoult.com>
-#
-# This file is part of BCF.
-#
-# BCF is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# BCF is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with BCF.  If not, see <http://www.gnu.org/licenses/>.
-
-class Project:
-    def __init__(self):
-        self.project_id = ""
-        self.name = ""
-        self.extension_schema = ""
-
-
-class BimSnippet:
-    def __init__(self):
-        self.snippet_type = None
-        self.is_external = False
-        self.reference = None
-        self.reference_schema = None
-
-
-class DocumentReference:
-    def __init__(self):
-        self.referenced_document = None
-        self.description = None
-        self.guid = None
-        self.is_external = False
-
-
-class RelatedTopic:
-    def __init__(self):
-        self.guid = None
-
-
-class HeaderFile:
-    def __init__(self):
-        self.filename = None
-        self.date = None
-        self.reference = None
-        self.ifc_project = None
-        self.ifc_spatial_structure_element = None
-        self.is_external = True
-
-
-class Header:
-    def __init__(self):
-        self.files = []
-
-
-class Topic:
-    def __init__(self):
-        self.reference_links = []
-        self.title = ""
-        self.priority = None
-        self.index = None  # Deprecated, stored, but ignored
-        self.labels = []
-        self.creation_date = None
-        self.creation_author = None
-        self.modified_date = None
-        self.modified_author = None
-        self.due_date = None
-        self.assigned_to = None
-        self.stage = None
-        self.description = None
-        self.bim_snippet = None
-        self.document_references = []
-        self.related_topics = []
-        self.topic_status = None
-        self.topic_type = None
-        self.guid = None
-
-        self.header = None
-        self.comments = {}
-        self.viewpoints = {}
-
-
-class Comment:
-    def __init__(self):
-        self.guid = None
-        self.date = None
-        self.author = None
-        self.comment = None
-        self.viewpoint = None
-        self.modified_date = None
-        self.modified_author = None
-        self.topic_guid = None  # Part of BCF-API
-
-
-class ViewSetupHints:
-    def __init__(self):
-        self.spaces_visible = False
-        self.space_boundaries_visible = False
-        self.openings_visible = False
-
-
-class Component:
-    def __init__(self):
-        self.originating_system = None
-        self.authoring_tool_id = None
-        self.ifc_guid = None
-
-
-class ComponentVisibility:
-    def __init__(self):
-        self.exceptions = []
-        self.default_visibility = False
-
-
-class Color:
-    def __init__(self):
-        self.color = None
-        self.components = []
-
-
-class Components:
-    def __init__(self):
-        self.view_setup_hints = None
-        self.selection = []
-        self.visibility = None
-        self.coloring = []
-
-
-class Point:
-    def __init__(self):
-        self.x = 0
-        self.y = 0
-        self.z = 0
-
-
-class Direction(Point):
-    pass
-
-
-class OrthogonalCamera:
-    def __init__(self):
-        self.camera_view_point = Point()
-        self.camera_direction = Direction()
-        self.camera_up_vector = Direction()
-        self.view_to_world_scale = 1.0
-
-
-class PerspectiveCamera:
-    def __init__(self):
-        self.camera_view_point = Point()
-        self.camera_direction = Direction()
-        self.camera_up_vector = Direction()
-        self.field_of_view = 60.0
-
-
-class Line:
-    def __init__(self):
-        self.start_point = Point()
-        self.end_point = Point()
-
-
-class ClippingPlane:
-    def __init__(self):
-        self.location = Point()
-        self.direction = Direction()
-
-
-class Bitmap:
-    def __init__(self):
-        self.reference = ""  # Only in BCF-XML
-        self.bitmap_data = None  # Only in BCF-API
-        self.bitmap_format = "PNG"  # Enum of png or jpg
-        self.location = Point()
-        self.normal = Direction()
-        self.up = Direction()
-        self.height = 1.0
-
-
-class Viewpoint:
-    def __init__(self):
-        self.guid = None
-        self.viewpoint = None
-        self.snapshot = None
-        self.index = None
-
-        self.components = None  # It's not a list, despite the plural name
-        self.orthogonal_camera = None
-        self.perspective_camera = None
-        self.lines = []
-        self.clipping_planes = []
-        self.bitmaps = []
@@ -0,0 +1,70 @@
+from bcf.v2.model.markup import (
+    BimSnippet,
+    Comment,
+    CommentViewpoint,
+    Header,
+    HeaderFile,
+    Markup,
+    Topic,
+    TopicDocumentReference,
+    TopicRelatedTopic,
+    ViewPoint,
+)
+from bcf.v2.model.project import Project, ProjectExtension
+from bcf.v2.model.version import Version
+from bcf.v2.model.visinfo import (
+    BitmapFormat,
+    ClippingPlane,
+    Component,
+    ComponentColoring,
+    ComponentColoringColor,
+    Components,
+    ComponentSelection,
+    ComponentVisibility,
+    ComponentVisibilityExceptions,
+    Direction,
+    Line,
+    OrthogonalCamera,
+    PerspectiveCamera,
+    Point,
+    ViewSetupHints,
+    VisualizationInfo,
+    VisualizationInfoBitmap,
+    VisualizationInfoClippingPlanes,
+    VisualizationInfoLines,
+)
+
+__all__ = [
+    "BimSnippet",
+    "Comment",
+    "CommentViewpoint",
+    "Header",
+    "HeaderFile",
+    "Markup",
+    "Topic",
+    "TopicDocumentReference",
+    "TopicRelatedTopic",
+    "ViewPoint",
+    "Project",
+    "ProjectExtension",
+    "Version",
+    "BitmapFormat",
+    "ClippingPlane",
+    "Component",
+    "ComponentColoring",
+    "ComponentColoringColor",
+    "ComponentSelection",
+    "ComponentVisibility",
+    "ComponentVisibilityExceptions",
+    "Components",
+    "Direction",
+    "Line",
+    "OrthogonalCamera",
+    "PerspectiveCamera",
+    "Point",
+    "ViewSetupHints",
+    "VisualizationInfo",
+    "VisualizationInfoBitmap",
+    "VisualizationInfoClippingPlanes",
+    "VisualizationInfoLines",
+]
@@ -0,0 +1,461 @@
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+from xsdata.models.datatype import XmlDateTime
+
+
+@dataclass(slots=True, kw_only=True)
+class BimSnippet:
+    reference: str = field(
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    reference_schema: str = field(
+        metadata={
+            "name": "ReferenceSchema",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    snippet_type: str = field(
+        metadata={
+            "name": "SnippetType",
+            "type": "Attribute",
+            "required": True,
+        }
+    )
+    is_external: bool = field(
+        default=False,
+        metadata={
+            "name": "isExternal",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class CommentViewpoint:
+    class Meta:
+        global_type = False
+
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class HeaderFile:
+    class Meta:
+        global_type = False
+
+    filename: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Filename",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "Date",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    reference: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    ifc_project: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcProject",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9,A-Z,a-z,_$]*",
+        }
+    )
+    ifc_spatial_structure_element: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcSpatialStructureElement",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9,A-Z,a-z,_$]*",
+        }
+    )
+    is_external: bool = field(
+        default=True,
+        metadata={
+            "name": "isExternal",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicDocumentReference:
+    class Meta:
+        global_type = False
+
+    referenced_document: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ReferencedDocument",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    description: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Description",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+    is_external: bool = field(
+        default=False,
+        metadata={
+            "name": "isExternal",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicRelatedTopic:
+    class Meta:
+        global_type = False
+
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ViewPoint:
+    viewpoint: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Viewpoint",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    snapshot: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Snapshot",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    index: Optional[int] = field(
+        default=None,
+        metadata={
+            "name": "Index",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Comment:
+    date: XmlDateTime = field(
+        metadata={
+            "name": "Date",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    author: str = field(
+        metadata={
+            "name": "Author",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    comment: str = field(
+        metadata={
+            "name": "Comment",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    viewpoint: Optional[CommentViewpoint] = field(
+        default=None,
+        metadata={
+            "name": "Viewpoint",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_author: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedAuthor",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Header:
+    file: List[HeaderFile] = field(
+        default_factory=list,
+        metadata={
+            "name": "File",
+            "type": "Element",
+            "namespace": "",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Topic:
+    reference_link: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "ReferenceLink",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    title: str = field(
+        metadata={
+            "name": "Title",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    priority: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Priority",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    index: Optional[int] = field(
+        default=None,
+        metadata={
+            "name": "Index",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    labels: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "Labels",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    creation_date: XmlDateTime = field(
+        metadata={
+            "name": "CreationDate",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    creation_author: str = field(
+        metadata={
+            "name": "CreationAuthor",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    modified_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_author: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedAuthor",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    due_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "DueDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    assigned_to: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "AssignedTo",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    stage: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Stage",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    description: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Description",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    bim_snippet: Optional[BimSnippet] = field(
+        default=None,
+        metadata={
+            "name": "BimSnippet",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    document_reference: List[TopicDocumentReference] = field(
+        default_factory=list,
+        metadata={
+            "name": "DocumentReference",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    related_topic: List[TopicRelatedTopic] = field(
+        default_factory=list,
+        metadata={
+            "name": "RelatedTopic",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
+    topic_type: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "TopicType",
+            "type": "Attribute",
+        }
+    )
+    topic_status: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "TopicStatus",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Markup:
+    header: Optional[Header] = field(
+        default=None,
+        metadata={
+            "name": "Header",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    topic: Topic = field(
+        metadata={
+            "name": "Topic",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    comment: List[Comment] = field(
+        default_factory=list,
+        metadata={
+            "name": "Comment",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    viewpoints: List[ViewPoint] = field(
+        default_factory=list,
+        metadata={
+            "name": "Viewpoints",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
@@ -0,0 +1,41 @@
+from dataclasses import dataclass, field
+from typing import Optional
+
+
+@dataclass(slots=True, kw_only=True)
+class Project:
+    name: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Name",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    project_id: str = field(
+        metadata={
+            "name": "ProjectId",
+            "type": "Attribute",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ProjectExtension:
+    project: Optional[Project] = field(
+        default=None,
+        metadata={
+            "name": "Project",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    extension_schema: str = field(
+        metadata={
+            "name": "ExtensionSchema",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
@@ -0,0 +1,21 @@
+from dataclasses import dataclass, field
+from typing import Optional
+
+
+@dataclass(slots=True, kw_only=True)
+class Version:
+    detailed_version: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "DetailedVersion",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    version_id: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "VersionId",
+            "type": "Attribute",
+        }
+    )
@@ -0,0 +1,476 @@
+from dataclasses import dataclass, field
+from enum import Enum
+from typing import List, Optional
+
+
+class BitmapFormat(Enum):
+    PNG = "PNG"
+    JPG = "JPG"
+
+
+@dataclass(slots=True, kw_only=True)
+class Component:
+    originating_system: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "OriginatingSystem",
+            "type": "Element",
+        }
+    )
+    authoring_tool_id: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "AuthoringToolId",
+            "type": "Element",
+        }
+    )
+    ifc_guid: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcGuid",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9,A-Z,a-z,_$]*",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Direction:
+    x: float = field(
+        metadata={
+            "name": "X",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    y: float = field(
+        metadata={
+            "name": "Y",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    z: float = field(
+        metadata={
+            "name": "Z",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Point:
+    x: float = field(
+        metadata={
+            "name": "X",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    y: float = field(
+        metadata={
+            "name": "Y",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    z: float = field(
+        metadata={
+            "name": "Z",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ViewSetupHints:
+    spaces_visible: Optional[bool] = field(
+        default=None,
+        metadata={
+            "name": "SpacesVisible",
+            "type": "Attribute",
+        }
+    )
+    space_boundaries_visible: Optional[bool] = field(
+        default=None,
+        metadata={
+            "name": "SpaceBoundariesVisible",
+            "type": "Attribute",
+        }
+    )
+    openings_visible: Optional[bool] = field(
+        default=None,
+        metadata={
+            "name": "OpeningsVisible",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ClippingPlane:
+    location: Point = field(
+        metadata={
+            "name": "Location",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    direction: Direction = field(
+        metadata={
+            "name": "Direction",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentColoringColor:
+    class Meta:
+        global_type = False
+
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+    color: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Color",
+            "type": "Attribute",
+            "pattern": r"[0-9,a-f,A-F]{6}([0-9,a-f,A-F]{2})?",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentSelection:
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentVisibilityExceptions:
+    class Meta:
+        global_type = False
+
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Line:
+    start_point: Point = field(
+        metadata={
+            "name": "StartPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    end_point: Point = field(
+        metadata={
+            "name": "EndPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class OrthogonalCamera:
+    """
+    Attributes
+        camera_view_point:
+        camera_direction:
+        camera_up_vector:
+        view_to_world_scale: view's visible size in meters
+    """
+    camera_view_point: Point = field(
+        metadata={
+            "name": "CameraViewPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_direction: Direction = field(
+        metadata={
+            "name": "CameraDirection",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_up_vector: Direction = field(
+        metadata={
+            "name": "CameraUpVector",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    view_to_world_scale: float = field(
+        metadata={
+            "name": "ViewToWorldScale",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class PerspectiveCamera:
+    """
+    Attributes
+        camera_view_point:
+        camera_direction:
+        camera_up_vector:
+        field_of_view: It is currently limited to a value between 45 and
+            60 degrees. This limitation will be dropped in the next
+            release and viewers should be expect values outside this
+            range in current implementations.
+    """
+    camera_view_point: Point = field(
+        metadata={
+            "name": "CameraViewPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_direction: Direction = field(
+        metadata={
+            "name": "CameraDirection",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_up_vector: Direction = field(
+        metadata={
+            "name": "CameraUpVector",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    field_of_view: float = field(
+        metadata={
+            "name": "FieldOfView",
+            "type": "Element",
+            "required": True,
+            "min_inclusive": 1.0,
+            "max_inclusive": 170.0,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoBitmap:
+    class Meta:
+        global_type = False
+
+    bitmap: BitmapFormat = field(
+        metadata={
+            "name": "Bitmap",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    reference: str = field(
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    location: Point = field(
+        metadata={
+            "name": "Location",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    normal: Direction = field(
+        metadata={
+            "name": "Normal",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    up: Direction = field(
+        metadata={
+            "name": "Up",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    height: float = field(
+        metadata={
+            "name": "Height",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentColoring:
+    color: List[ComponentColoringColor] = field(
+        default_factory=list,
+        metadata={
+            "name": "Color",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentVisibility:
+    exceptions: Optional[ComponentVisibilityExceptions] = field(
+        default=None,
+        metadata={
+            "name": "Exceptions",
+            "type": "Element",
+        }
+    )
+    default_visibility: Optional[bool] = field(
+        default=None,
+        metadata={
+            "name": "DefaultVisibility",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoClippingPlanes:
+    class Meta:
+        global_type = False
+
+    clipping_plane: List[ClippingPlane] = field(
+        default_factory=list,
+        metadata={
+            "name": "ClippingPlane",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoLines:
+    class Meta:
+        global_type = False
+
+    line: List[Line] = field(
+        default_factory=list,
+        metadata={
+            "name": "Line",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Components:
+    view_setup_hints: Optional[ViewSetupHints] = field(
+        default=None,
+        metadata={
+            "name": "ViewSetupHints",
+            "type": "Element",
+        }
+    )
+    selection: Optional[ComponentSelection] = field(
+        default=None,
+        metadata={
+            "name": "Selection",
+            "type": "Element",
+        }
+    )
+    visibility: ComponentVisibility = field(
+        metadata={
+            "name": "Visibility",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    coloring: Optional[ComponentColoring] = field(
+        default=None,
+        metadata={
+            "name": "Coloring",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfo:
+    """
+    VisualizationInfo documentation.
+    """
+    components: Optional[Components] = field(
+        default=None,
+        metadata={
+            "name": "Components",
+            "type": "Element",
+        }
+    )
+    orthogonal_camera: Optional[OrthogonalCamera] = field(
+        default=None,
+        metadata={
+            "name": "OrthogonalCamera",
+            "type": "Element",
+        }
+    )
+    perspective_camera: Optional[PerspectiveCamera] = field(
+        default=None,
+        metadata={
+            "name": "PerspectiveCamera",
+            "type": "Element",
+        }
+    )
+    lines: Optional[VisualizationInfoLines] = field(
+        default=None,
+        metadata={
+            "name": "Lines",
+            "type": "Element",
+        }
+    )
+    clipping_planes: Optional[VisualizationInfoClippingPlanes] = field(
+        default=None,
+        metadata={
+            "name": "ClippingPlanes",
+            "type": "Element",
+        }
+    )
+    bitmap: List[VisualizationInfoBitmap] = field(
+        default_factory=list,
+        metadata={
+            "name": "Bitmap",
+            "type": "Element",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}",
+        }
+    )
@@ -0,0 +1,304 @@
+"""BCF XML V2 Topic handler."""
+import datetime
+import tempfile
+import uuid
+import zipfile
+from pathlib import Path
+from typing import Any, NoReturn, Optional
+
+import numpy as np
+from ifcopenshell import entity_instance
+from numpy.typing import NDArray
+from xsdata.models.datatype import XmlDateTime
+
+import bcf.v2.model as mdl
+from bcf.inmemory_zipfile import ZipFileInterface
+from bcf.v2.visinfo import VisualizationInfoHandler
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer
+
+
+class TopicHandler:
+    """BCF Topic and related objects handler."""
+
+    def __init__(
+        self,
+        topic_dir: Optional[zipfile.Path] = None,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> None:
+        self._markup: Optional[mdl.Markup] = None
+        self._viewpoints: dict[str, VisualizationInfoHandler] = {}
+        self._reference_files: dict[str, bytes] = {}
+        self._document_references: dict[str, bytes] = {}
+        self._bim_snippet: Optional[bytes] = None
+        self._xml_handler = xml_handler or XmlParserSerializer()
+        self._topic_dir = topic_dir
+
+    @property
+    def markup(self) -> Optional[mdl.Markup]:
+        if not self._markup:
+            markup_path = self._topic_dir.joinpath("markup.bcf")
+            if markup_path.exists():
+                self._markup = self._xml_handler.parse(markup_path.read_bytes(), mdl.Markup)
+        return self._markup
+
+    @markup.setter
+    def markup(self, value: mdl.Markup) -> None:
+        self._markup = value
+
+    @property
+    def topic(self) -> mdl.Topic:
+        """Return the Topic object."""
+        return self.markup.topic
+
+    @property
+    def guid(self) -> str:
+        """Return the GUID of the topic."""
+        if self._markup:
+            return self.topic.guid
+        return self._topic_dir.name if self._topic_dir else ""
+
+    @property
+    def header(self) -> Optional[mdl.Header]:
+        """Return the header of the topic."""
+        return self.markup.header if self.markup else None
+
+    @property
+    def comments(self) -> list[mdl.Comment]:
+        """Return the comments of the topic."""
+        return self.markup.comment if self.markup else []
+
+    @property
+    def bim_snippet(self) -> Optional[bytes]:
+        if not self._bim_snippet and self._topic_dir:
+            self._bim_snippet = self._load_bim_snippet()
+        return self._bim_snippet
+
+    @bim_snippet.setter
+    def bim_snippet(self, value: bytes) -> None:
+        self._bim_snippet = value
+
+    @property
+    def viewpoints(self) -> dict[str, VisualizationInfoHandler]:
+        if not self._viewpoints and self._topic_dir:
+            self._viewpoints = self._load_viewpoints()
+        return self._viewpoints
+
+    @property
+    def reference_files(self) -> dict[str, bytes]:
+        if self._reference_files or not self.header:
+            return self._reference_files
+        for ref in self.header.file:
+            if ref.is_external:
+                continue
+            real_path = self._topic_dir
+            for path_part in ref.reference.split("/"):
+                real_path = real_path.parent if path_part == ".." else real_path.joinpath(path_part)
+            self._reference_files[ref.reference] = real_path.read_bytes()
+        return self._reference_files
+
+    @property
+    def document_references(self) -> dict[str, bytes]:
+        if self._document_references or not self.topic:
+            return self._document_references
+        for doc in self.topic.document_reference:
+            if doc.is_external or not doc.referenced_document:
+                continue
+            real_path = self._topic_dir
+            for path_part in doc.referenced_document.split("/"):
+                real_path = real_path.parent if path_part == ".." else real_path.joinpath(path_part)
+            self._document_references[doc.referenced_document] = real_path.read_bytes()
+        return self._document_references
+
+    def _load_bim_snippet(self) -> Optional[bytes]:
+        bim_snippet_obj = self.topic.bim_snippet
+        if bim_snippet_obj and not bim_snippet_obj.is_external:
+            bim_snippet_path = self._topic_dir.joinpath(bim_snippet_obj.reference)
+            if bim_snippet_path.exists():
+                return bim_snippet_path.read_bytes()
+        return None
+
+    def _load_viewpoints(self) -> dict[str, VisualizationInfoHandler]:
+        if self.markup and (viewpoints := self.markup.viewpoints):
+            return VisualizationInfoHandler.from_topic_viewpoints(self._topic_dir, viewpoints)
+        return {}
+
+    @classmethod
+    def create_new(
+        cls,
+        title: str,
+        description: str,
+        author: str,
+        topic_type: str = "",
+        topic_status: str = "",
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "TopicHandler":
+        """
+        Create a new BCF topic.
+
+        Args:
+            title: The title of the topic.
+            description: The description of the topic.
+            author: The author of the topic.
+            topic_type: The type of the topic.
+            topic_status: The status of the topic.
+            xml_handler: The XML parser/serializer to use.
+
+        Returns:
+            The BCF topic definition.
+        """
+        creation_date = XmlDateTime.from_datetime(datetime.datetime.now())
+        guid = str(uuid.uuid4())
+        topic = mdl.Topic(
+            title=title,
+            description=description,
+            creation_author=author,
+            creation_date=creation_date,
+            guid=guid,
+            topic_type=topic_type,
+            topic_status=topic_status,
+        )
+        markup = mdl.Markup(topic=topic)
+        obj = cls(topic_dir=Path(guid), xml_handler=xml_handler or XmlParserSerializer())
+        obj.markup = markup
+        return obj
+
+    def save(self, destination_zip: ZipFileInterface) -> None:
+        """
+        Save the topic to a BCF zip file.
+
+        Args:
+            bcf_zip: The BCF zip file to save to.
+        """
+        topic_dir = self.guid
+        self._save_xml(destination_zip, self._markup, "markup.bcf")
+        self._save_viewpoints(destination_zip, topic_dir)
+        self._save_bim_snippet(destination_zip)
+        self._save_reference_files(destination_zip)
+        self._save_document_references(destination_zip)
+
+    def _save_viewpoints(self, destination_zip: ZipFileInterface, topic_dir: str) -> None:
+        if not self.markup or not (viewpoints := self.markup.viewpoints):
+            return
+        for vpt in viewpoints:
+            if vpt.viewpoint:
+                self.viewpoints[vpt.viewpoint].save(destination_zip, topic_dir, vpt)
+
+    def _save_xml(self, destination_zip: ZipFileInterface, item: Any, target: str) -> None:
+        if self._topic_dir is None:
+            return
+        to_write = self._xml_handler.serialize(item) if item else self._topic_dir.joinpath(target).read_bytes()
+        destination_zip.writestr(f"{self._topic_dir.name}/{target}", to_write)
+
+    def _save_bim_snippet(self, destination_zip: ZipFileInterface) -> None:
+        snippet = self.topic.bim_snippet
+        if not snippet or snippet.is_external:
+            return
+        ref_filename = Path(snippet.reference).name
+        if self.bim_snippet:
+            destination_zip.writestr(f"{self.topic.guid}/{ref_filename}", self.bim_snippet)
+
+    def _save_reference_files(self, destination_zip: ZipFileInterface) -> None:
+        if not self.header:
+            return
+        for ref in self.header.file:
+            if ref.is_external or not ref.reference:
+                continue
+            real_path = self._topic_dir
+            for path_part in ref.reference.split("/"):
+                real_path = real_path.parent if path_part == ".." else real_path.joinpath(path_part)
+            destination_zip.writestr(real_path.at, self.reference_files[ref.reference])
+
+    def _save_document_references(self, destination_zip: ZipFileInterface) -> None:
+        if not self.topic:
+            return
+        for doc in self.topic.document_reference:
+            if doc.is_external or not doc.referenced_document:
+                continue
+            real_path = self._topic_dir
+            for path_part in doc.referenced_document.split("/"):
+                real_path = real_path.parent if path_part == ".." else real_path.joinpath(path_part)
+            destination_zip.writestr(real_path.at, self.document_references[doc.referenced_document])
+
+    def extract_file(self, entity, outfile: Optional[Path] = None) -> Path:
+        """Extracts an element with a file into a temporary directory
+
+        These include header files, bim snippets, document references, and
+        viewpoint bitmaps. External reference are not downloaded. Instead, the
+        URI reference is returned.
+
+        :param entity: The entity with a file reference to extract
+        :type entity: bcf.v2.model.HeaderFile,bcf.v2.model.BimSnippet,bcf.v2.model.TopicDocumentReference
+        :param outfile: If provided, save the header file to that location.
+            Otherwise, a temporary directory is created and the filename is
+            derived from the header's original filename.
+        :type outfile: pathlib.Path,optional
+        :return: The filepath of the extracted file. It may be a URL if the
+            header file is external.
+        :rtype: Path
+        """
+        if hasattr(entity, "reference"):
+            reference = entity.reference
+        else:
+            reference = entity.referenced_document
+
+        if not reference:
+            return
+
+        if getattr(entity, "is_external", False):
+            return entity.reference
+
+        resolved_reference = self._topic_dir
+
+        for part in Path(reference).parts:
+            if part == "..":
+                resolved_reference = resolved_reference.parent
+            else:
+                resolved_reference = resolved_reference.joinpath(part)
+
+        if not outfile:
+            if getattr(entity, "filename", None):
+                filename = entity.filename
+            else:
+                filename = resolved_reference.name
+            outfile = Path(tempfile.mkdtemp()) / filename
+
+        with open(outfile, "wb") as f:
+            f.write(resolved_reference.read_bytes())
+
+        return outfile
+
+    def add_viewpoint(self, element: entity_instance) -> None:
+        """Add a viewpoint pointed at the placement of an IFC element to the topic.
+
+        Args:
+            element: The IFC element.
+        """
+        new_viewpoint = VisualizationInfoHandler.create_new(element, self._xml_handler)
+        self.add_visinfo_handler(new_viewpoint)
+
+    def add_viewpoint_from_point_and_guids(self, position: NDArray[np.float_], *guids: str) -> None:
+        """Add a viewpoint pointing at an XYZ point in space
+
+        Args:
+            position: the XYZ point in space
+            guids: one or more element GlobalIds.
+        """
+        vi_handler = VisualizationInfoHandler.create_from_point_and_guids(
+            position, *guids, xml_handler=self._xml_handler
+        )
+        self.add_visinfo_handler(vi_handler)
+
+    def add_visinfo_handler(self, new_viewpoint: VisualizationInfoHandler) -> None:
+        self.viewpoints[new_viewpoint.guid + ".bcfv"] = new_viewpoint
+        self.markup.viewpoints.append(mdl.ViewPoint(viewpoint=new_viewpoint.guid + ".bcfv", guid=new_viewpoint.guid))
+
+    def __eq__(self, other: object) -> bool | NoReturn:
+        return (
+            (
+                self.markup == other.markup
+                and self.viewpoints == other.viewpoints
+                and self.bim_snippet == other.bim_snippet
+            )
+            if isinstance(other, TopicHandler)
+            else NotImplemented
+        )
@@ -0,0 +1,299 @@
+import uuid
+import zipfile
+from functools import lru_cache
+from typing import Any, Iterable, Optional
+
+import numpy as np
+from ifcopenshell import entity_instance
+import ifcopenshell.util.unit
+import ifcopenshell.util.placement
+from numpy.typing import NDArray
+
+import bcf.v2.model as mdl
+from bcf.geometry import (
+    camera_vectors_from_element_placement,
+    camera_vectors_from_target_position,
+)
+from bcf.inmemory_zipfile import ZipFileInterface
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer
+
+
+class VisualizationInfoHandler:
+    """Handle the VisualizationInfo and related objects."""
+
+    def __init__(
+        self,
+        visualization_info: mdl.VisualizationInfo,
+        snapshot: Optional[bytes] = None,
+        bitmaps: Optional[dict[str, bytes]] = None,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> None:
+        self.visualization_info = visualization_info
+        self.snapshot = snapshot
+        self.bitmaps = bitmaps or {}
+        self._xml_handler = xml_handler or XmlParserSerializer()
+
+    @property
+    def guid(self) -> str:
+        """Return the GUID of the visualization info."""
+        return self.visualization_info.guid
+
+    @classmethod
+    def from_topic_viewpoints(
+        cls,
+        topic_dir: zipfile.Path,
+        vps: Iterable[mdl.ViewPoint],
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> dict[str, "VisualizationInfoHandler"]:
+        """Create VisualizationInfoHandler objects of a Topic's ViewPoints."""
+        viewpoints = {}
+        for vpt in vps:
+            visinfo = cls.load(topic_dir, vpt, xml_handler)
+            if visinfo and vpt.viewpoint:
+                viewpoints[vpt.viewpoint] = visinfo
+        return viewpoints
+
+    @classmethod
+    def load(
+        cls,
+        topic_dir: zipfile.Path,
+        vpt: mdl.ViewPoint,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> Optional["VisualizationInfoHandler"]:
+        """
+        Load the VisualizationInfo and related objects from a BCF zip file.
+
+        Args:
+            topic_dir: The directory in the BCF zip file to load from.
+            vpt: The ViewPoint to load.
+            xml_handler: The XML handler to use to parse the VisualizationInfo.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        visinfo = cls._load_visinfo(topic_dir, vpt.viewpoint, xml_handler)
+        if not visinfo:
+            return None
+        snapshot = cls._load_snapshot(topic_dir, vpt.snapshot)
+        bitmaps = cls._load_bitmaps(topic_dir, visinfo)
+        return cls(visinfo, snapshot, bitmaps, xml_handler)
+
+    @staticmethod
+    def _load_visinfo(
+        topic_dir: zipfile.Path,
+        vp_name: Optional[str],
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> Optional[mdl.VisualizationInfo]:
+        if not vp_name:
+            return None
+        vp_path = topic_dir.joinpath(vp_name)
+        if vp_path.exists():
+            xml_handler = xml_handler or XmlParserSerializer()
+            return xml_handler.parse(vp_path.read_bytes(), mdl.VisualizationInfo)
+        return None
+
+    @staticmethod
+    def _load_snapshot(topic_dir: zipfile.Path, vp_snapshot: Optional[str]) -> Optional[bytes]:
+        if vp_snapshot:
+            snapshot_path = topic_dir.joinpath(vp_snapshot)
+            if snapshot_path.exists():
+                return snapshot_path.read_bytes()
+        return None
+
+    @staticmethod
+    def _load_bitmaps(topic_dir: zipfile.Path, visinfo: Optional[mdl.VisualizationInfo]) -> dict[str, bytes]:
+        if not visinfo or not (bitmaps := visinfo.bitmap):
+            return {}
+        bitmaps_dict = {}
+        for bitmap in bitmaps:
+            if not bitmap.reference:
+                continue
+            bitmap_path = topic_dir.joinpath(bitmap.reference)
+            if bitmap_path.exists():
+                bitmaps_dict[bitmap.reference] = bitmap_path.read_bytes()
+        return bitmaps_dict
+
+    def save(
+        self,
+        bcf_zip: ZipFileInterface,
+        topic_dir: str,
+        vpt: mdl.ViewPoint,
+    ) -> None:
+        """
+        Save the VisualizationInfo and related objects to a BCF zip file.
+
+        Args:
+            bcf_zip: The BCF zip file to save to.
+            topic_dir: The directory in the BCF zip file to save to.
+            vpt: The ViewPoint to save.
+        """
+        if not (vp_name := vpt.viewpoint):
+            return
+        self._save_visinfo(bcf_zip, topic_dir, vp_name)
+        self._save_snapshot(bcf_zip, topic_dir, vpt.snapshot)
+        self._save_bitmaps(bcf_zip, topic_dir)
+
+    def _save_snapshot(self, bcf_zip: ZipFileInterface, topic_dir: str, filename: Optional[str]) -> None:
+        if self.snapshot and filename:
+            bcf_zip.writestr(f"{topic_dir}/{filename}", self.snapshot)
+
+    def _save_visinfo(self, bcf_zip: ZipFileInterface, topic_dir: str, vp_name: str) -> None:
+        bcf_zip.writestr(
+            f"{topic_dir}/{vp_name}",
+            self._xml_handler.serialize(self.visualization_info),
+        )
+
+    def _save_bitmaps(self, bcf_zip: ZipFileInterface, topic_dir: str) -> None:
+        if not self.bitmaps:
+            return
+        if not (bitmaps_defs := self.visualization_info.bitmap):
+            return
+        for bitmap_def in bitmaps_defs:
+            if not (bitmap_name := bitmap_def.reference):
+                continue
+            if bitmap_name in self.bitmaps:
+                bcf_zip.writestr(f"{topic_dir}/{bitmap_name}", self.bitmaps[bitmap_name])
+
+    @classmethod
+    def create_new(
+        cls,
+        element: entity_instance,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "VisualizationInfoHandler":
+        """
+        Create a new VisualizationInfoHandler object from an IFC element.
+
+        Args:
+            element: The IFC element to point at.
+            xml_handler: The XML handler to use.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        xml_handler = xml_handler or XmlParserSerializer()
+        return cls(visualization_info=build_viewpoint(element), xml_handler=xml_handler)
+
+    @classmethod
+    def create_from_point_and_guids(
+        cls,
+        position: NDArray[np.float_],
+        *guids: str,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "VisualizationInfoHandler":
+        """
+        Create a new VisualizationInfoHandler object from an IFC element.
+
+        Args:
+            position: target point coordinates.
+            *guids: One or more IFC element GUID.
+            xml_handler: The XML handler to use.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        xml_handler = xml_handler or XmlParserSerializer()
+        return cls(
+            visualization_info=build_viewpoint_from_position_and_guids(position, *guids), xml_handler=xml_handler
+        )
+
+
+@lru_cache(maxsize=None)
+def build_viewpoint(element: entity_instance) -> mdl.VisualizationInfo:
+    """
+    Return a BCF viewpoint of an IFC element.
+
+    This function is cached to speedudp the creation of multiple BCF topics regarding the same element.
+
+    Args:
+        element: The IFC element to point at.
+
+    Returns:
+        The BCF viewpoint definition.
+    """
+    ifc_file = element.wrapped_data.file
+    unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
+    elem_placement = ifcopenshell.util.placement.get_local_placement(element.ObjectPlacement)
+    elem_placement[0][3] *= unit_scale
+    elem_placement[1][3] *= unit_scale
+    elem_placement[2][3] *= unit_scale
+
+    return mdl.VisualizationInfo(
+        guid=str(uuid.uuid4()),
+        components=build_components(element.GlobalId),
+        perspective_camera=build_camera(elem_placement),
+    )
+
+
+def build_viewpoint_from_position_and_guids(position: NDArray[np.float_], *guids: str) -> mdl.VisualizationInfo:
+    """
+    Return a BCF viewpoint of an IFC element.
+
+    This function is cached to speedudp the creation of multiple BCF topics regarding the same element.
+
+    Args:
+        position: target point coordinates.
+        *guids: One or more IFC element GUID.
+
+    Returns:
+        The BCF viewpoint definition.
+    """
+    return mdl.VisualizationInfo(
+        guid=str(uuid.uuid4()),
+        components=build_components(*guids),
+        perspective_camera=build_camera_from_vectors(*camera_vectors_from_target_position(position)),
+    )
+
+
+def build_components(*guids: str) -> mdl.Components:
+    """
+    Return the BCF components from an IFC element GUID.
+
+    Args:
+        *guids: One or more IFC element GUID.
+
+    Returns:
+        The BCF components definition.
+    """
+    components = [mdl.Component(ifc_guid=guid) for guid in guids]
+    return mdl.Components(
+        selection=mdl.ComponentSelection(component=components),
+        visibility=mdl.ComponentVisibility(default_visibility=True),
+    )
+
+
+def build_camera(elem_placement: NDArray[np.float_]) -> mdl.PerspectiveCamera:
+    """
+    Return a BCF camera for an IFC element placement matrix.
+
+    Args:
+        elem_placement: The IFC element placement as a rototranslation matrix.
+
+    Returns:
+        The BCF camera definition.
+    """
+    return build_camera_from_vectors(*camera_vectors_from_element_placement(elem_placement))
+
+
+def build_camera_from_vectors(
+    camera_position: NDArray[np.float_], camera_dir: NDArray[np.float_], camera_up: NDArray[np.float_]
+) -> mdl.PerspectiveCamera:
+    """
+    Return a BCF camera for an IFC element placement matrix.
+
+    Args:
+        camera_position: camera position array
+        camera_dir: camera direction versor
+        camera_up_vector: camera up versor
+
+    Returns:
+        The BCF camera definition.
+    """
+    camera_viewpoint = mdl.Point(x=camera_position[0], y=camera_position[1], z=camera_position[2])
+    camera_direction = mdl.Direction(x=camera_dir[0], y=camera_dir[1], z=camera_dir[2])
+    camera_up_vector = mdl.Direction(x=camera_up[0], y=camera_up[1], z=camera_up[2])
+    return mdl.PerspectiveCamera(
+        camera_view_point=camera_viewpoint,
+        camera_direction=camera_direction,
+        camera_up_vector=camera_up_vector,
+        field_of_view=60.0,
+    )
@@ -1,19 +1 @@
-
-# BCF - BCF Python library
-# Copyright (C) 2021 Prabhat Singh <singh01prabhat@gmail.com>
-#
-# This file is part of BCF.
-#
-# BCF is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# BCF is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with BCF.  If not, see <http://www.gnu.org/licenses/>.
-
+"""BCF XML v3 handler."""
@@ -1,4 +1,3 @@
-
 # BCF - BCF Python library
 # Copyright (C) 2021 Prabhat Singh <singh01prabhat@gmail.com>
 #
@@ -17,25 +16,27 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with BCF.  If not, see <http://www.gnu.org/licenses/>.

-import uuid
-import time
-import json
-import urllib
-import requests
-import webbrowser
-import http.server
 import base64
-import tempfile
+import http.server
 import os
+import tempfile
+import time
+import urllib
+import uuid
+import webbrowser
+from re import A
+from typing import Any, Optional, Tuple
+
+import requests

 client_id, client_secret = "", ""


 class OAuthReceiver(http.server.BaseHTTPRequestHandler):
-    def do_GET(self):
+    def do_GET(self) -> None:
        query = urllib.parse.parse_qs(urllib.parse.urlparse(self.path).query)
-        self.server.auth_code = query.get("code", [""])[0]
-        self.server.auth_state = query.get("state", [""])[0]
+        self.server.auth_code = query.get("code", [""])[0]  # type:ignore
+        self.server.auth_state = query.get("state", [""])[0]  # type:ignore
        self.send_response(200)
        self.send_header("Content-type", "text/plain")
        self.end_headers()
@@ -43,20 +44,21 @@ class OAuthReceiver(http.server.BaseHTTPRequestHandler):


 class FoundationClient:
-    def __init__(self, client_id, client_secret, base_url=None, redirect_subdir=None):
+    def __init__(
+        self, client_id: str, client_secret: str, base_url: Optional[str] = None, redirect_subdir: Optional[str] = None
+    ) -> None:
        self.baseurl = base_url
        self.access_token = ""
        self.refresh_token = ""
        self.access_token_expires_on = time.time()
        self.refresh_token_expires_on = float("inf")
-        self.auth_endpoint = None
-        self.token_endpoint = None
+        self.token_endpoint = ""
        self.client_id = client_id
        self.client_secret = client_secret
-        self.auth_method = None
+        self.auth_method: Optional[str] = None
        self.redirect_subdir = redirect_subdir

-    def get_access_token(self):
+    def get_access_token(self) -> str:
        if self.access_token and self.access_token_expires_on > time.time():
            return self.access_token
        elif self.refresh_token and self.refresh_token_expires_on > time.time():
@@ -65,18 +67,18 @@ class FoundationClient:
            self.login()
        return self.access_token

-    def get_auth_methods(self):
+    def get_auth_methods(self) -> list[Any]:
        resp = requests.get(f"{self.baseurl}foundation/1.0/auth")
        return resp.json()["supported_oauth2_flows"]

-    def get_versions(self):
+    def get_versions(self) -> list[Any]:
        resp = requests.get(f"{self.baseurl}foundation/versions")
        return resp.json()["versions"]

-    def login(self):
+    def login(self) -> None:
        resp = requests.get(f"{self.baseurl}foundation/1.0/auth")
        values = resp.json()
-        self.auth_endpoint = values["oauth2_auth_url"]
+        auth_endpoint = values["oauth2_auth_url"]
        self.token_endpoint = values["oauth2_token_url"]

        with http.server.HTTPServer(("", 8080), OAuthReceiver) as server:
@@ -89,25 +91,22 @@ class FoundationClient:
                    "redirect_uri": f"http://localhost:{server.server_address[1]}/{self.redirect_subdir}",
                }
            )
-            if "?" in self.auth_endpoint:
-                webbrowser.open(f"{self.auth_endpoint}&{query}")
+            if "?" in auth_endpoint:
+                webbrowser.open(f"{auth_endpoint}&{query}")
            else:
-                webbrowser.open(f"{self.auth_endpoint}?{query}")
+                webbrowser.open(f"{auth_endpoint}?{query}")
            server.timeout = 100
-            server.state = state
            server.handle_request()
-            if server.auth_code and server.auth_state == state:
+            if server.auth_code and server.auth_state == state:  # pylint: disable=E1101
                data = {
                    "grant_type": "authorization_code",
-                    "code": server.auth_code,
+                    "code": server.auth_code,  # pylint: disable=E1101 type:ignore
                    "redirect_uri": f"http://localhost:{server.server_address[1]}/{self.redirect_subdir}",
                }
-                auth_string = f"{self.client_id}:{self.client_secret}"
-                header_string = base64.b64encode(auth_string.encode("utf-8")).decode("utf-8")
-                headers = {"Authorization": f"Basic {header_string}"}
+                headers = self._get_access_token_headers()
                self.set_tokens_from_response(requests.post(self.token_endpoint, data=data, headers=headers))

-    def get_refresh_token(self):
+    def get_refresh_token(self) -> None:
        self.set_tokens_from_response(
            requests.post(
                self.token_endpoint,
@@ -118,10 +117,8 @@ class FoundationClient:
            ).json()
        )

-    def get_new_access_token(self):
-        auth_string = f"{self.client_id}:{self.client_secret}"
-        header_string = base64.b64encode(auth_string.encode("utf-8")).decode("utf-8")
-        headers = {"Authorization": f"Basic {header_string}"}
+    def get_new_access_token(self) -> None:
+        headers = self._get_access_token_headers()
        self.set_tokens_from_response(
            requests.post(
                self.token_endpoint,
@@ -133,35 +130,41 @@ class FoundationClient:
            ).json()
        )

-    def set_auth_method(self, method="authorization_code_grant"):
+    def _get_access_token_headers(self) -> dict[str, str]:
+        auth_string = f"{self.client_id}:{self.client_secret}"
+        header_string = base64.b64encode(auth_string.encode("utf-8")).decode("utf-8")
+        return {"Authorization": f"Basic {header_string}"}
+
+    def set_auth_method(self, method: str = "authorization_code_grant") -> None:
        if method != "authorization_code_grant":
            raise NotImplementedError(f"{method} not supported")
        else:
            self.auth_method = method

-    def set_tokens_from_response(self, response):
-        response = response.json()
-        self.access_token = response["access_token"]
-        self.refresh_token = response["refresh_token"]
-        self.access_token_expires_on = time.time() + response["expires_in"]
-        if "refresh_token_expires_in" in response:
-            self.refresh_token_expires_on = time.time() + response["refresh_token_expires_in"]
+    def set_tokens_from_response(self, response: requests.Response) -> None:
+        response_dict = response.json()
+        self.access_token = response_dict["access_token"]
+        self.refresh_token = response_dict["refresh_token"]
+        self.access_token_expires_on = time.time() + response_dict["expires_in"]
+        if "refresh_token_expires_in" in response_dict:
+            self.refresh_token_expires_on = time.time() + response_dict["refresh_token_expires_in"]


 class BcfClient:
-    def __init__(self, foundation_client):
+    def __init__(self, foundation_client: FoundationClient) -> None:
        self.foundation_client = foundation_client
-        self.version_id = None
-        self.baseurl = None
+        self.version_id: Optional[str] = None
+        self.baseurl: Optional[str] = None
        self.filepath = tempfile.mkdtemp()

-    def set_version(self, version):
+    def set_version(self, version: dict[str, str]) -> None:
        self.version_id = version["version_id"]
        self.baseurl = version["api_base_url"]

-    def get(self, endpoint, params=None, is_auth_required=False):
+    def get(self, endpoint: str, params: Any = None, is_auth_required: bool = False) -> Any:
        # TODO: handle error http status codes and raise exception. Follow error.json standard.
-        headers = {"Authorization": "Bearer " + self.foundation_client.get_access_token()}
+        headers = {"Authorization": f"Bearer {self.foundation_client.get_access_token()}"}
+
        response = requests.get(f"{self.baseurl}{endpoint}", headers=headers, params=params or None)
        try:
            response = requests.get(f"{self.baseurl}{endpoint}", headers=headers, params=params or None)
@@ -171,68 +174,62 @@ class BcfClient:
        except requests.exceptions.HTTPError as e:
            print(f"message: {response.reason}'   '{response.status_code}'   '{ e }")

-    def post(self, endpoint, data=None, params=None):
+    def post(self, endpoint: str, data: Any = None, params: Any = None) -> Tuple[int, str]:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/json",
        }
+
        try:
            response = requests.post(
-                f"{self.baseurl}{endpoint}",
-                headers=headers,
-                params=params or None,
-                data=data or None,
+                f"{self.baseurl}{endpoint}", headers=headers, params=params or None, data=data or None
            )
-            if response.status_code == 201:
-                return response.status_code, response.text
-            response.raise_for_status()
+
+            if response.status_code != 201:
+                response.raise_for_status()
+            return response.status_code, response.text
        except requests.exceptions.HTTPError as errh:
            print(f"message: {response.reason}'  '{response.status_code}, {errh}")
+            return response.status_code, response.reason

-    def put(self, endpoint, data=None, params=None):
+    def put(self, endpoint: str, data: Any = None, params: Any = None) -> Tuple[int, str]:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/json",
        }
+
        try:
            response = requests.put(
-                f"{self.baseurl}{endpoint}",
-                headers=headers,
-                params=params or None,
-                data=data or None,
+                f"{self.baseurl}{endpoint}", headers=headers, params=params or None, data=data or None
            )
-            if response.status_code == 200:
-                return response.status_code, response.text
-            response.raise_for_status()
+
+            if response.status_code != 200:
+                response.raise_for_status()
+            return response.status_code, response.text
        except requests.exceptions.HTTPError as errh:
            print(f"message: {response.reason}'  '{response.status_code}, {errh}")
+            return response.status_code, response.reason

-    def delete(self, endpoint, params=None):
+    def delete(self, endpoint: str, params: Any = None) -> Tuple[int, str]:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/json",
        }
+
        try:
-            response = requests.delete(
-                f"{self.baseurl}{endpoint}",
-                headers=headers,
-                params=params or None,
-            )
-            if response.status_code == 200:
-                return response.status_code, response.text
-            response.raise_for_status()
+            response = requests.delete(f"{self.baseurl}{endpoint}", headers=headers, params=params or None)
+
+            if response.status_code != 200:
+                response.raise_for_status()
+            return response.status_code, response.text
        except requests.exceptions.HTTPError as errh:
            print(f"message: {response.reason}'  '{response.status_code}, {errh}")
+            return response.status_code, response.reason

-    def get_projects(self) -> list:
-        return self.get(
-            f"/projects",
-        )
+    def get_projects(self) -> list[Any]:
+        return self.get("/projects")

-    def get_project(
-        self,
-        project_id="",
-    ) -> dict:
+    def get_project(self, project_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}",
            {
@@ -240,16 +237,13 @@ class BcfClient:
            },
        )

-    def update_project(self, project_id="", data=None) -> dict:
+    def update_project(self, project_id: str = "", data: Any = None) -> Tuple[int, str]:
        url = f"{self.baseurl}/projects/{project_id}"
-        headers = {"Authorization": "Bearer " + self.foundation_client.get_access_token()}
+        headers = {"Authorization": f"Bearer {self.foundation_client.get_access_token()}"}
        resp = requests.put(url, headers=headers, data=data)
        return resp.status_code, resp.text

-    def get_extensions(
-        self,
-        project_id="",
-    ) -> dict:
+    def get_extensions(self, project_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/extensions",
            {
@@ -259,10 +253,10 @@ class BcfClient:

    def get_topics(
        self,
-        project_id="",
-        topics="",
-        query_string=None,
-    ) -> list:
+        project_id: str = "",
+        topics: str = "",
+        query_string: Optional[str] = None,
+    ) -> list[Any]:
        # return self.get(
        #     f"/projects/{project_id}/topics",
        #     {
@@ -273,7 +267,7 @@ class BcfClient:
        # )
        pass

-    def get_topic(self, project_id="", topic_id="") -> dict:
+    def get_topic(self, project_id: str = "", topic_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}",
            {
@@ -282,42 +276,40 @@ class BcfClient:
            },
        )

-    def create_topic(self, project_id="", data=None):
+    def create_topic(self, project_id: str = "", data: Any = None) -> Tuple[int, str]:
        return self.post(f"/projects/{project_id}/topics", data=data)

-    def update_topic(self, project_id="", topic_id="", data=None) -> dict:
+    def update_topic(self, project_id: str = "", topic_id: str = "", data: Any = None) -> Tuple[int, str]:
        return self.put(f"/projects/{project_id}/topics/{topic_id}", data=data)

-    def delete_topic(self, project_id="", topic_id=""):
+    def delete_topic(self, project_id: str = "", topic_id: str = "") -> Tuple[int, str]:
        return self.delete(f"/projects/{project_id}/topics/{topic_id}")

-    def get_snippet(self, project_id="", topic_id="") -> str:
+    def get_snippet(self, project_id: str = "", topic_id: str = "") -> Tuple[int, str]:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/octet-stream",
        }
-        response = requests.get(
-            f"{self.baseurl}/projects/{project_id}/topics/{topic_id}/snippet",
-            headers=headers,
-        )
-        # TODO: write to tmpdir
-        with open(os.path.join(self.filepath, f"{project_id}_{topic_id}_snippet.txt"), "wb") as f:
-            f.write(response.content.decode("utf-8"))
-        return response.status_code, response.content

-    def update_snippet(self, project_id="", topic_id="", files=None, data=None):
+        response = requests.get(f"{self.baseurl}/projects/{project_id}/topics/{topic_id}/snippet", headers=headers)
+        content = response.content.decode("utf-8")
+        with open(os.path.join(self.filepath, f"{project_id}_{topic_id}_snippet.txt"), "w") as f:
+            f.write(content)
+        return response.status_code, content
+
+    def update_snippet(self, project_id: str = "", topic_id: str = "", files: Any = None, data: Any = None) -> int:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/octet-stream",
        }
+
        response = requests.put(
-            f"{self.baseurl}/projects/{project_id}/topics/{topic_id}/snippet",
-            headers=headers,
-            files=files,
+            f"{self.baseurl}/projects/{project_id}/topics/{topic_id}/snippet", headers=headers, files=files
        )
+
        return response.status_code

-    def get_files_information(self, project_id="") -> list:
+    def get_files_information(self, project_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/files_information",
            {
@@ -325,7 +317,7 @@ class BcfClient:
            },
        )

-    def get_files(self, project_id="", topic_id="") -> list:
+    def get_files(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/files",
            {
@@ -336,32 +328,32 @@ class BcfClient:

    def update_files(
        self,
-        project_id="",
-        topic_id="",
-        data=None,
-        params=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        data: Any = None,
+        params: Any = None,
+    ) -> Tuple[int, str]:
        return self.put(
            f"/projects/{project_id}/topics/{topic_id}/files",
            data=data,
        )

-    def get_comments(self, project_id="", topic_id="") -> list:
+    def get_comments(self, project_id: str = "", topic_id: str = "") -> None:
        pass

    def create_comments(
        self,
-        project_id="",
-        topic_id="",
-        data=None,
-        params=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        data: Any = None,
+        params: Any = None,
+    ) -> Tuple[int, str]:
        return self.post(
            f"/projects/{project_id}/topics/{topic_id}/comments",
            data=data,
        )

-    def get_comment(self, project_id="", topic_id="", comment_id="") -> dict:
+    def get_comment(self, project_id: str = "", topic_id: str = "", comment_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/comments/{comment_id}",
            {
@@ -371,22 +363,22 @@ class BcfClient:
            },
        )

-    def delete_comment(self, project_id="", topic_id="", comment_id=""):
+    def delete_comment(self, project_id: str = "", topic_id: str = "", comment_id: str = "") -> Tuple[int, str]:
        return self.delete(f"/projects/{project_id}/topics/{topic_id}/comments/{comment_id}")

    def update_comment(
        self,
-        project_id="",
-        topic_id="",
-        comment_id="",
-        data=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        comment_id: str = "",
+        data: Any = None,
+    ) -> Tuple[int, str]:
        return self.put(
            f"/projects/{project_id}/topics/{topic_id}/comments/{comment_id}",
            data=data,
        )

-    def get_viewpoints(self, project_id="", topic_id="") -> list:
+    def get_viewpoints(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints",
            {
@@ -395,13 +387,13 @@ class BcfClient:
            },
        )

-    def create_viewpoints(self, project_id="", topic_id="", data=None):
+    def create_viewpoints(self, project_id: str = "", topic_id: str = "", data: Any = None) -> Tuple[int, str]:
        return self.post(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints",
            data=data,
        )

-    def get_viewpoint(self, project_id="", topic_id="", viewpoint_id="") -> dict:
+    def get_viewpoint(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}",
            {
@@ -413,15 +405,15 @@ class BcfClient:

    def delete_viewpoint(
        self,
-        project_id="",
-        topic_id="",
-        viewpoint_id="",
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        viewpoint_id: str = "",
+    ) -> Tuple[int, str]:
        return self.delete(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}",
        )

-    def get_snapshot(self, project_id="", topic_id="", viewpoint_id="") -> str:
+    def get_snapshot(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "") -> str:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}/snapshot",
            {
@@ -431,7 +423,7 @@ class BcfClient:
            },
        )

-    def get_bitmap(self, project_id="", topic_id="", viewpoint_id="", bitmap_id="") -> str:
+    def get_bitmap(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "", bitmap_id: str = "") -> str:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}/bitmaps/{bitmap_id}",
            {
@@ -442,7 +434,7 @@ class BcfClient:
            },
        )

-    def get_selection(self, project_id="", topic_id="", viewpoint_id="") -> dict:
+    def get_selection(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}/selection",
            {
@@ -452,7 +444,7 @@ class BcfClient:
            },
        )

-    def get_coloring(self, project_id="", topic_id="", viewpoint_id="") -> dict:
+    def get_coloring(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}/coloring",
            {
@@ -462,7 +454,7 @@ class BcfClient:
            },
        )

-    def get_visibility(self, project_id="", topic_id="", viewpoint_id="") -> dict:
+    def get_visibility(self, project_id: str = "", topic_id: str = "", viewpoint_id: str = "") -> dict[str, Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/viewpoints/{viewpoint_id}/visibility",
            {
@@ -472,7 +464,7 @@ class BcfClient:
            },
        )

-    def get_related_topics(self, project_id="", topic_id="") -> list:
+    def get_related_topics(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/related_topics",
            {
@@ -483,16 +475,16 @@ class BcfClient:

    def update_related_topics(
        self,
-        project_id="",
-        topic_id="",
-        data=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        data: Any = None,
+    ) -> Tuple[int, str]:
        return self.put(
            f"/projects/{project_id}/topics/{topic_id}/related_topics",
            data=data,
        )

-    def get_document_references(self, project_id="", topic_id="") -> list:
+    def get_document_references(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/document_references",
            {
@@ -503,10 +495,10 @@ class BcfClient:

    def create_document_reference(
        self,
-        project_id="",
-        topic_id="",
-        data=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        data: Any = None,
+    ) -> Tuple[int, str]:
        return self.post(
            f"/projects/{project_id}/topics/{topic_id}/document_references",
            data=data,
@@ -514,17 +506,17 @@ class BcfClient:

    def update_document_references(
        self,
-        project_id="",
-        topic_id="",
-        document_reference_id="",
-        data=None,
-    ):
+        project_id: str = "",
+        topic_id: str = "",
+        document_reference_id: str = "",
+        data: Any = None,
+    ) -> Tuple[int, str]:
        return self.put(
            f"/projects/{project_id}/topics/{topic_id}/document_references/{document_reference_id}",
            data=data,
        )

-    def get_documents(self, project_id="", topic_id="") -> list:
+    def get_documents(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/documents",
            {
@@ -534,40 +526,36 @@ class BcfClient:
        )

    def create_document(
-        self,
-        project_id="",
-        topic_id="",
-        guid=None,
-        files=None,
-        data=None,
-    ):
+        self, project_id: str = "", topic_id: str = "", guid: Optional[str] = None, files: Any = None, data: Any = None
+    ) -> int:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/octet-stream",
        }
+
        response = requests.post(
            f"/projects/{project_id}/topics/{topic_id}/documents",
            data=data,
-            params={guid},
+            params={"guid": guid},
            files=files,
            headers=headers,
        )
+
        return response.status_code

-    def get_document(self, project_id="", topic_id="", document_id="") -> str:
+    def get_document(self, project_id: str = "", topic_id: str = "", document_id: str = "") -> Tuple[int, str]:
        headers = {
-            "Authorization": "Bearer " + self.foundation_client.get_access_token(),
+            "Authorization": f"Bearer {self.foundation_client.get_access_token()}",
            "Content-type": "application/octet-stream",
        }
-        response = requests.get(
-            f"{self.baseurl}/projects/{project_id}/topics/documents/{document_id}",
-            headers=headers,
-        )
-        with open(os.path.join(self.filepath, f"{project_id}_{topic_id}_{document_id}_document.txt"), "wb") as f:
-            f.write(response.content.decode("utf-8"))
-        return response.status_code, response.content

-    def get_topics_events(self, project_id="") -> list:
+        response = requests.get(f"{self.baseurl}/projects/{project_id}/topics/documents/{document_id}", headers=headers)
+        content = response.content.decode("utf-8")
+        with open(os.path.join(self.filepath, f"{project_id}_{topic_id}_{document_id}_document.txt"), "w") as f:
+            f.write(content)
+        return response.status_code, content
+
+    def get_topics_events(self, project_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/events",
            {
@@ -575,7 +563,7 @@ class BcfClient:
            },
        )

-    def get_topic_events(self, project_id="", topic_id="") -> list:
+    def get_topic_events(self, project_id: str = "", topic_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/events",
            {
@@ -584,7 +572,7 @@ class BcfClient:
            },
        )

-    def get_comments_events(self, project_id="") -> list:
+    def get_comments_events(self, project_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/comments/events",
            {
@@ -592,7 +580,7 @@ class BcfClient:
            },
        )

-    def get_comment_events(self, project_id="", topic_id="", comment_id="") -> list:
+    def get_comment_events(self, project_id: str = "", topic_id: str = "", comment_id: str = "") -> list[Any]:
        return self.get(
            f"/projects/{project_id}/topics/{topic_id}/comments/{comment_id}/events",
            {
@@ -1,200 +0,0 @@
-
-# BCF - BCF Python library
-# Copyright (C) 2021 Prabhat Singh <singh01prabhat@gmail.com>
-#
-# This file is part of BCF.
-#
-# BCF is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# BCF is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with BCF.  If not, see <http://www.gnu.org/licenses/>.
-
-class Project:
-    def __init__(self):
-        self.project_id = ""
-        self.name = ""
-
-
-class BimSnippet:
-    def __init__(self):
-        self.snippet_type = None
-        self.is_external = False
-        self.reference = None
-        self.reference_schema = None
-
-
-class DocumentReference:
-    def __init__(self):
-        self.description = None
-        self.document_guid = None
-        self.url = None
-        self.guid = None
-
-
-class RelatedTopic:
-    def __init__(self):
-        self.guid = None
-
-
-class HeaderFile:
-    def __init__(self):
-        self.filename = ""
-        self.date = None
-        self.reference = ""
-        self.ifc_project = None
-        self.ifc_spatial_structure_element = None
-        self.is_external = True
-
-
-class Header:
-    def __init__(self):
-        self.files = []
-
-
-class Topic:
-    def __init__(self):
-        self.reference_links = []
-        self.title = ""
-        self.priority = None
-        self.index = None  # Deprecated, stored, but ignored
-        self.labels = []
-        self.creation_date = None
-        self.creation_author = None
-        self.modified_date = None
-        self.modified_author = None
-        self.due_date = None
-        self.assigned_to = None
-        self.stage = None
-        self.description = None
-        self.bim_snippet = None
-        self.document_references = []
-        self.related_topics = []
-        self.topic_status = None
-        self.topic_type = None
-        self.guid = None
-
-        self.header = None
-        self.comments = {}
-        self.viewpoints = {}
-        self.server_assigned_id = ""
-
-
-class Comment:
-    def __init__(self):
-        self.guid = None
-        self.date = None
-        self.author = ""
-        self.comment = ""
-        self.viewpoint = None
-        self.modified_date = None
-        self.modified_author = ""
-
-
-class ViewSetupHints:
-    def __init__(self):
-        self.spaces_visible = False
-        self.space_boundaries_visible = False
-        self.openings_visible = False
-
-
-class Component:
-    def __init__(self):
-        self.originating_system = None
-        self.authoring_tool_id = None
-        self.ifc_guid = None
-
-
-class ComponentVisibility:
-    def __init__(self):
-        self.exceptions = []
-        self.default_visibility = False
-        self.view_setup_hints = None
-
-
-class Color:
-    def __init__(self):
-        self.color = None
-        self.components = []
-
-
-class Components:
-    def __init__(self):
-
-        self.selection = []
-        self.visibility = None
-        self.coloring = []
-
-
-class Point:
-    def __init__(self):
-        self.x = 0
-        self.y = 0
-        self.z = 0
-
-
-class Direction(Point):
-    pass
-
-
-class OrthogonalCamera:
-    def __init__(self):
-        self.camera_view_point = Point()
-        self.camera_direction = Direction()
-        self.camera_up_vector = Direction()
-        self.view_to_world_scale = 1.0
-        self.aspect_ratio = 1.0
-
-
-class PerspectiveCamera:
-    def __init__(self):
-        self.camera_view_point = Point()
-        self.camera_direction = Direction()
-        self.camera_up_vector = Direction()
-        self.field_of_view = 60.0
-        self.aspect_ratio = 1.0
-
-
-class Line:
-    def __init__(self):
-        self.start_point = Point()
-        self.end_point = Point()
-
-
-class ClippingPlane:
-    def __init__(self):
-        self.location = Point()
-        self.direction = Direction()
-
-
-class Bitmap:
-    def __init__(self):
-        self.reference = ""  # Only in BCF-XML
-        self.bitmap_data = None  # Only in BCF-API
-        self.bitmap_format = "PNG"  # Enum of png or jpg
-        self.location = Point()
-        self.normal = Direction()
-        self.up = Direction()
-        self.height = 1.0
-
-
-class Viewpoint:
-    def __init__(self):
-        self.guid = None
-        self.viewpoint = None
-        self.snapshot = None
-        self.index = None
-
-        self.components = None  # It's not a list, despite the plural name
-        self.orthogonal_camera = None
-        self.perspective_camera = None
-        self.lines = []
-        self.clipping_planes = []
-        self.bitmaps = []
@@ -0,0 +1,61 @@
+"""BCF XML V3 Documents handler."""
+import zipfile
+from typing import Any, Optional
+
+import bcf.v3.model as mdl
+from bcf.inmemory_zipfile import ZipFileInterface
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer
+
+
+class DocumentsHandler:
+    """BCF documents handler."""
+
+    def __init__(
+        self,
+        definition: mdl.DocumentInfo,
+        documents: Optional[dict[str, bytes]] = None,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> None:
+        self.definition = definition
+        self.documents = documents or {}
+        self._xml_handler = xml_handler or XmlParserSerializer()
+
+    @classmethod
+    def load(
+        cls,
+        zip_file: zipfile.ZipFile,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> Optional["DocumentsHandler"]:
+        """
+        Loads the documents from the given zip file directory.
+
+        Args:
+            zip_path: The directory path inside the zip file.
+            xml_handler: The xml parser/serializer to use.
+
+        Returns:
+            The documents handler.
+        """
+        xml_handler = xml_handler or XmlParserSerializer()
+        file_to_open = zipfile.Path(zip_file, "documents.xml")
+        if not file_to_open.exists():
+            return None
+        definition = xml_handler.parse(file_to_open.read_bytes(), mdl.DocumentInfo)
+        documents = {}
+        if def_docs := definition.documents:
+            for document in def_docs.document:
+                document_path = zipfile.Path(zip_file, f"documents/{document.guid}")
+                if document_path.exists():
+                    documents[document.filename] = document_path.read_bytes()
+        return cls(definition, documents=documents)
+
+    def save(self, bcf_zip: ZipFileInterface) -> None:
+        """Save the documents to the zip file."""
+        bcf_zip.writestr("documents.xml", self._xml_handler.serialize(self.definition))
+        if documents := self.definition.documents:
+            for doc in documents.document:
+                if doc.filename in self.documents:
+                    bcf_zip.writestr(
+                        f"documents/{doc.guid}",
+                        self.documents[doc.filename],
+                    )
@@ -0,0 +1,110 @@
+from bcf.v3.model.documents import Document, DocumentInfo, DocumentInfoDocuments
+from bcf.v3.model.extensions import (
+    Extensions,
+    ExtensionsPriorities,
+    ExtensionsSnippetTypes,
+    ExtensionsStages,
+    ExtensionsTopicLabels,
+    ExtensionsTopicStatuses,
+    ExtensionsTopicTypes,
+    ExtensionsUsers,
+)
+from bcf.v3.model.markup import (
+    BimSnippet,
+    Comment,
+    CommentViewpoint,
+    DocumentReference,
+    File,
+    Header,
+    HeaderFiles,
+    Markup,
+    Topic,
+    TopicComments,
+    TopicDocumentReferences,
+    TopicLabels,
+    TopicReferenceLinks,
+    TopicRelatedTopics,
+    TopicRelatedTopicsRelatedTopic,
+    TopicViewpoints,
+    ViewPoint,
+)
+from bcf.v3.model.project import Project, ProjectInfo
+from bcf.v3.model.version import Version
+from bcf.v3.model.visinfo import (
+    Bitmap,
+    BitmapFormat,
+    ClippingPlane,
+    Component,
+    ComponentColoring,
+    ComponentColoringColor,
+    ComponentColoringColorComponents,
+    Components,
+    ComponentSelection,
+    ComponentVisibility,
+    ComponentVisibilityExceptions,
+    Direction,
+    Line,
+    OrthogonalCamera,
+    PerspectiveCamera,
+    Point,
+    ViewSetupHints,
+    VisualizationInfo,
+    VisualizationInfoBitmaps,
+    VisualizationInfoClippingPlanes,
+    VisualizationInfoLines,
+)
+
+__all__ = [
+    "Document",
+    "DocumentInfo",
+    "DocumentInfoDocuments",
+    "Extensions",
+    "ExtensionsPriorities",
+    "ExtensionsSnippetTypes",
+    "ExtensionsStages",
+    "ExtensionsTopicLabels",
+    "ExtensionsTopicStatuses",
+    "ExtensionsTopicTypes",
+    "ExtensionsUsers",
+    "BimSnippet",
+    "Comment",
+    "CommentViewpoint",
+    "DocumentReference",
+    "File",
+    "Header",
+    "HeaderFiles",
+    "Markup",
+    "Topic",
+    "TopicComments",
+    "TopicDocumentReferences",
+    "TopicLabels",
+    "TopicReferenceLinks",
+    "TopicRelatedTopics",
+    "TopicRelatedTopicsRelatedTopic",
+    "TopicViewpoints",
+    "ViewPoint",
+    "Project",
+    "ProjectInfo",
+    "Version",
+    "Bitmap",
+    "BitmapFormat",
+    "ClippingPlane",
+    "Component",
+    "ComponentColoring",
+    "ComponentColoringColor",
+    "ComponentColoringColorComponents",
+    "ComponentSelection",
+    "ComponentVisibility",
+    "ComponentVisibilityExceptions",
+    "Components",
+    "Direction",
+    "Line",
+    "OrthogonalCamera",
+    "PerspectiveCamera",
+    "Point",
+    "ViewSetupHints",
+    "VisualizationInfo",
+    "VisualizationInfoBitmaps",
+    "VisualizationInfoClippingPlanes",
+    "VisualizationInfoLines",
+]
@@ -0,0 +1,61 @@
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+
+@dataclass(slots=True, kw_only=True)
+class Document:
+    filename: str = field(
+        metadata={
+            "name": "Filename",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    description: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Description",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class DocumentInfoDocuments:
+    class Meta:
+        global_type = False
+
+    document: List[Document] = field(
+        default_factory=list,
+        metadata={
+            "name": "Document",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class DocumentInfo:
+    documents: Optional[DocumentInfoDocuments] = field(
+        default=None,
+        metadata={
+            "name": "Documents",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
@@ -0,0 +1,181 @@
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsPriorities:
+    class Meta:
+        global_type = False
+
+    priority: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "Priority",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsSnippetTypes:
+    class Meta:
+        global_type = False
+
+    snippet_type: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "SnippetType",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsStages:
+    class Meta:
+        global_type = False
+
+    stage: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "Stage",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsTopicLabels:
+    class Meta:
+        global_type = False
+
+    topic_label: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "TopicLabel",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsTopicStatuses:
+    class Meta:
+        global_type = False
+
+    topic_status: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "TopicStatus",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsTopicTypes:
+    class Meta:
+        global_type = False
+
+    topic_type: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "TopicType",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ExtensionsUsers:
+    class Meta:
+        global_type = False
+
+    user: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "User",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Extensions:
+    topic_types: Optional[ExtensionsTopicTypes] = field(
+        default=None,
+        metadata={
+            "name": "TopicTypes",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    topic_statuses: Optional[ExtensionsTopicStatuses] = field(
+        default=None,
+        metadata={
+            "name": "TopicStatuses",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    priorities: Optional[ExtensionsPriorities] = field(
+        default=None,
+        metadata={
+            "name": "Priorities",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    topic_labels: Optional[ExtensionsTopicLabels] = field(
+        default=None,
+        metadata={
+            "name": "TopicLabels",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    users: Optional[ExtensionsUsers] = field(
+        default=None,
+        metadata={
+            "name": "Users",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    snippet_types: Optional[ExtensionsSnippetTypes] = field(
+        default=None,
+        metadata={
+            "name": "SnippetTypes",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    stages: Optional[ExtensionsStages] = field(
+        default=None,
+        metadata={
+            "name": "Stages",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
@@ -0,0 +1,616 @@
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+from xsdata.models.datatype import XmlDateTime
+
+
+@dataclass(slots=True, kw_only=True)
+class BimSnippet:
+    reference: str = field(
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    reference_schema: str = field(
+        metadata={
+            "name": "ReferenceSchema",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    snippet_type: str = field(
+        metadata={
+            "name": "SnippetType",
+            "type": "Attribute",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    is_external: bool = field(
+        default=False,
+        metadata={
+            "name": "IsExternal",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class CommentViewpoint:
+    class Meta:
+        global_type = False
+
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class DocumentReference:
+    document_guid: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "DocumentGuid",
+            "type": "Element",
+            "namespace": "",
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+    url: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Url",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    description: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Description",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class File:
+    filename: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Filename",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "Date",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    reference: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    ifc_project: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcProject",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9A-Za-z_$]*",
+        }
+    )
+    ifc_spatial_structure_element: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcSpatialStructureElement",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9A-Za-z_$]*",
+        }
+    )
+    is_external: bool = field(
+        default=True,
+        metadata={
+            "name": "IsExternal",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicLabels:
+    class Meta:
+        global_type = False
+
+    label: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "Label",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicReferenceLinks:
+    class Meta:
+        global_type = False
+
+    reference_link: List[str] = field(
+        default_factory=list,
+        metadata={
+            "name": "ReferenceLink",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicRelatedTopicsRelatedTopic:
+    class Meta:
+        global_type = False
+
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ViewPoint:
+    viewpoint: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Viewpoint",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    snapshot: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Snapshot",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    index: Optional[int] = field(
+        default=None,
+        metadata={
+            "name": "Index",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Comment:
+    date: XmlDateTime = field(
+        metadata={
+            "name": "Date",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    author: str = field(
+        metadata={
+            "name": "Author",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    comment: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Comment",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    viewpoint: Optional[CommentViewpoint] = field(
+        default=None,
+        metadata={
+            "name": "Viewpoint",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_author: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedAuthor",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class HeaderFiles:
+    class Meta:
+        global_type = False
+
+    file: List[File] = field(
+        default_factory=list,
+        metadata={
+            "name": "File",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicDocumentReferences:
+    class Meta:
+        global_type = False
+
+    document_reference: List[DocumentReference] = field(
+        default_factory=list,
+        metadata={
+            "name": "DocumentReference",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicRelatedTopics:
+    class Meta:
+        global_type = False
+
+    related_topic: List[TopicRelatedTopicsRelatedTopic] = field(
+        default_factory=list,
+        metadata={
+            "name": "RelatedTopic",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicViewpoints:
+    class Meta:
+        global_type = False
+
+    view_point: List[ViewPoint] = field(
+        default_factory=list,
+        metadata={
+            "name": "ViewPoint",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Header:
+    files: Optional[HeaderFiles] = field(
+        default=None,
+        metadata={
+            "name": "Files",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class TopicComments:
+    class Meta:
+        global_type = False
+
+    comment: List[Comment] = field(
+        default_factory=list,
+        metadata={
+            "name": "Comment",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Topic:
+    reference_links: Optional[TopicReferenceLinks] = field(
+        default=None,
+        metadata={
+            "name": "ReferenceLinks",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    title: str = field(
+        metadata={
+            "name": "Title",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    priority: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Priority",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    index: Optional[int] = field(
+        default=None,
+        metadata={
+            "name": "Index",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    labels: Optional[TopicLabels] = field(
+        default=None,
+        metadata={
+            "name": "Labels",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    creation_date: XmlDateTime = field(
+        metadata={
+            "name": "CreationDate",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
+    creation_author: str = field(
+        metadata={
+            "name": "CreationAuthor",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    modified_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    modified_author: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ModifiedAuthor",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    due_date: Optional[XmlDateTime] = field(
+        default=None,
+        metadata={
+            "name": "DueDate",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    assigned_to: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "AssignedTo",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    stage: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Stage",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    description: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Description",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    bim_snippet: Optional[BimSnippet] = field(
+        default=None,
+        metadata={
+            "name": "BimSnippet",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    document_references: Optional[TopicDocumentReferences] = field(
+        default=None,
+        metadata={
+            "name": "DocumentReferences",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    related_topics: Optional[TopicRelatedTopics] = field(
+        default=None,
+        metadata={
+            "name": "RelatedTopics",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    comments: Optional[TopicComments] = field(
+        default=None,
+        metadata={
+            "name": "Comments",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    viewpoints: Optional[TopicViewpoints] = field(
+        default=None,
+        metadata={
+            "name": "Viewpoints",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
+    server_assigned_id: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "ServerAssignedId",
+            "type": "Attribute",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    topic_type: str = field(
+        metadata={
+            "name": "TopicType",
+            "type": "Attribute",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    topic_status: str = field(
+        metadata={
+            "name": "TopicStatus",
+            "type": "Attribute",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Markup:
+    header: Optional[Header] = field(
+        default=None,
+        metadata={
+            "name": "Header",
+            "type": "Element",
+            "namespace": "",
+        }
+    )
+    topic: Topic = field(
+        metadata={
+            "name": "Topic",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
@@ -0,0 +1,37 @@
+from dataclasses import dataclass, field
+from typing import Optional
+
+
+@dataclass(slots=True, kw_only=True)
+class Project:
+    name: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "Name",
+            "type": "Element",
+            "namespace": "",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    project_id: str = field(
+        metadata={
+            "name": "ProjectId",
+            "type": "Attribute",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ProjectInfo:
+    project: Project = field(
+        metadata={
+            "name": "Project",
+            "type": "Element",
+            "namespace": "",
+            "required": True,
+        }
+    )
@@ -0,0 +1,12 @@
+from dataclasses import dataclass, field
+
+
+@dataclass(slots=True, kw_only=True)
+class Version:
+    version_id: str = field(
+        metadata={
+            "name": "VersionId",
+            "type": "Attribute",
+            "required": True,
+        }
+    )
@@ -0,0 +1,524 @@
+from dataclasses import dataclass, field
+from enum import Enum
+from typing import List, Optional
+
+
+class BitmapFormat(Enum):
+    PNG = "png"
+    JPG = "jpg"
+
+
+@dataclass(slots=True, kw_only=True)
+class Component:
+    originating_system: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "OriginatingSystem",
+            "type": "Element",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    authoring_tool_id: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "AuthoringToolId",
+            "type": "Element",
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    ifc_guid: Optional[str] = field(
+        default=None,
+        metadata={
+            "name": "IfcGuid",
+            "type": "Attribute",
+            "length": 22,
+            "pattern": r"[0-9A-Za-z_$]*",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Direction:
+    x: float = field(
+        metadata={
+            "name": "X",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    y: float = field(
+        metadata={
+            "name": "Y",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    z: float = field(
+        metadata={
+            "name": "Z",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Point:
+    x: float = field(
+        metadata={
+            "name": "X",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    y: float = field(
+        metadata={
+            "name": "Y",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    z: float = field(
+        metadata={
+            "name": "Z",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ViewSetupHints:
+    spaces_visible: bool = field(
+        default=False,
+        metadata={
+            "name": "SpacesVisible",
+            "type": "Attribute",
+        }
+    )
+    space_boundaries_visible: bool = field(
+        default=False,
+        metadata={
+            "name": "SpaceBoundariesVisible",
+            "type": "Attribute",
+        }
+    )
+    openings_visible: bool = field(
+        default=False,
+        metadata={
+            "name": "OpeningsVisible",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Bitmap:
+    format: BitmapFormat = field(
+        metadata={
+            "name": "Format",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    reference: str = field(
+        metadata={
+            "name": "Reference",
+            "type": "Element",
+            "required": True,
+            "min_length": 1,
+            "white_space": "collapse",
+        }
+    )
+    location: Point = field(
+        metadata={
+            "name": "Location",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    normal: Direction = field(
+        metadata={
+            "name": "Normal",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    up: Direction = field(
+        metadata={
+            "name": "Up",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    height: float = field(
+        metadata={
+            "name": "Height",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ClippingPlane:
+    location: Point = field(
+        metadata={
+            "name": "Location",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    direction: Direction = field(
+        metadata={
+            "name": "Direction",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentColoringColorComponents:
+    class Meta:
+        global_type = False
+
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+            "min_occurs": 1,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentSelection:
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentVisibilityExceptions:
+    class Meta:
+        global_type = False
+
+    component: List[Component] = field(
+        default_factory=list,
+        metadata={
+            "name": "Component",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Line:
+    start_point: Point = field(
+        metadata={
+            "name": "StartPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    end_point: Point = field(
+        metadata={
+            "name": "EndPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class OrthogonalCamera:
+    """
+    Attributes
+        camera_view_point:
+        camera_direction:
+        camera_up_vector:
+        view_to_world_scale: view's visible vertical size in meters
+        aspect_ratio: Proportional relationship between the width and
+            the height of the view (w/h).
+    """
+    camera_view_point: Point = field(
+        metadata={
+            "name": "CameraViewPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_direction: Direction = field(
+        metadata={
+            "name": "CameraDirection",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_up_vector: Direction = field(
+        metadata={
+            "name": "CameraUpVector",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    view_to_world_scale: float = field(
+        metadata={
+            "name": "ViewToWorldScale",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    aspect_ratio: float = field(
+        metadata={
+            "name": "AspectRatio",
+            "type": "Element",
+            "required": True,
+            "min_exclusive": 0.0,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class PerspectiveCamera:
+    """
+    Attributes
+        camera_view_point:
+        camera_direction:
+        camera_up_vector:
+        field_of_view: Vertical field of view, in degrees. It is
+            currently limited to a value between 45 and 60 degrees. This
+            limitation will be dropped in the next release and viewers
+            should be expect values outside this range in current
+            implementations.
+        aspect_ratio: Proportional relationship between the width and
+            the height of the view (w/h).
+    """
+    camera_view_point: Point = field(
+        metadata={
+            "name": "CameraViewPoint",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_direction: Direction = field(
+        metadata={
+            "name": "CameraDirection",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    camera_up_vector: Direction = field(
+        metadata={
+            "name": "CameraUpVector",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    field_of_view: float = field(
+        metadata={
+            "name": "FieldOfView",
+            "type": "Element",
+            "required": True,
+            "min_exclusive": 0.0,
+            "max_exclusive": 180.0,
+        }
+    )
+    aspect_ratio: float = field(
+        metadata={
+            "name": "AspectRatio",
+            "type": "Element",
+            "required": True,
+            "min_exclusive": 0.0,
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentColoringColor:
+    class Meta:
+        global_type = False
+
+    components: ComponentColoringColorComponents = field(
+        metadata={
+            "name": "Components",
+            "type": "Element",
+            "required": True,
+        }
+    )
+    color: str = field(
+        metadata={
+            "name": "Color",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[0-9A-Fa-f]{6}([0-9A-Fa-f]{2})?",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentVisibility:
+    view_setup_hints: Optional[ViewSetupHints] = field(
+        default=None,
+        metadata={
+            "name": "ViewSetupHints",
+            "type": "Element",
+        }
+    )
+    exceptions: Optional[ComponentVisibilityExceptions] = field(
+        default=None,
+        metadata={
+            "name": "Exceptions",
+            "type": "Element",
+        }
+    )
+    default_visibility: bool = field(
+        default=False,
+        metadata={
+            "name": "DefaultVisibility",
+            "type": "Attribute",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoBitmaps:
+    class Meta:
+        global_type = False
+
+    bitmap: List[Bitmap] = field(
+        default_factory=list,
+        metadata={
+            "name": "Bitmap",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoClippingPlanes:
+    class Meta:
+        global_type = False
+
+    clipping_plane: List[ClippingPlane] = field(
+        default_factory=list,
+        metadata={
+            "name": "ClippingPlane",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfoLines:
+    class Meta:
+        global_type = False
+
+    line: List[Line] = field(
+        default_factory=list,
+        metadata={
+            "name": "Line",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class ComponentColoring:
+    color: List[ComponentColoringColor] = field(
+        default_factory=list,
+        metadata={
+            "name": "Color",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class Components:
+    selection: Optional[ComponentSelection] = field(
+        default=None,
+        metadata={
+            "name": "Selection",
+            "type": "Element",
+        }
+    )
+    visibility: Optional[ComponentVisibility] = field(
+        default=None,
+        metadata={
+            "name": "Visibility",
+            "type": "Element",
+        }
+    )
+    coloring: Optional[ComponentColoring] = field(
+        default=None,
+        metadata={
+            "name": "Coloring",
+            "type": "Element",
+        }
+    )
+
+
+@dataclass(slots=True, kw_only=True)
+class VisualizationInfo:
+    """
+    VisualizationInfo documentation.
+    """
+    components: Optional[Components] = field(
+        default=None,
+        metadata={
+            "name": "Components",
+            "type": "Element",
+        }
+    )
+    orthogonal_camera: Optional[OrthogonalCamera] = field(
+        default=None,
+        metadata={
+            "name": "OrthogonalCamera",
+            "type": "Element",
+        }
+    )
+    perspective_camera: Optional[PerspectiveCamera] = field(
+        default=None,
+        metadata={
+            "name": "PerspectiveCamera",
+            "type": "Element",
+        }
+    )
+    lines: Optional[VisualizationInfoLines] = field(
+        default=None,
+        metadata={
+            "name": "Lines",
+            "type": "Element",
+        }
+    )
+    clipping_planes: Optional[VisualizationInfoClippingPlanes] = field(
+        default=None,
+        metadata={
+            "name": "ClippingPlanes",
+            "type": "Element",
+        }
+    )
+    bitmaps: Optional[VisualizationInfoBitmaps] = field(
+        default=None,
+        metadata={
+            "name": "Bitmaps",
+            "type": "Element",
+        }
+    )
+    guid: str = field(
+        metadata={
+            "name": "Guid",
+            "type": "Attribute",
+            "required": True,
+            "pattern": r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}",
+        }
+    )
@@ -0,0 +1,206 @@
+"""BCF XML V3 Topic handler."""
+import datetime
+import uuid
+import zipfile
+from pathlib import Path
+from typing import Any, NoReturn, Optional
+
+import numpy as np
+from ifcopenshell import entity_instance
+from numpy.typing import NDArray
+from xsdata.models.datatype import XmlDateTime
+
+import bcf.v3.model as mdl
+from bcf.inmemory_zipfile import ZipFileInterface
+from bcf.v3.visinfo import VisualizationInfoHandler
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer
+
+
+class TopicHandler:
+    """BCF Topic and related objects handler."""
+
+    def __init__(
+        self,
+        topic_dir: Optional[zipfile.Path] = None,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> None:
+        self._markup: Optional[mdl.Markup] = None
+        self._viewpoints: dict[str, VisualizationInfoHandler] = {}
+        self._bim_snippet: Optional[bytes] = None
+        self._xml_handler = xml_handler or XmlParserSerializer()
+        self._topic_dir = topic_dir
+
+    @property
+    def markup(self) -> Optional[mdl.Markup]:
+        if not self._markup and self._topic_dir:
+            markup_path = self._topic_dir.joinpath("markup.bcf")
+            if markup_path.exists():
+                self._markup = self._xml_handler.parse(markup_path.read_bytes(), mdl.Markup)
+        return self._markup
+
+    @markup.setter
+    def markup(self, value: mdl.Markup) -> None:
+        self._markup = value
+
+    @property
+    def topic(self) -> mdl.Topic:
+        """Return the Topic object."""
+        return self.markup.topic
+
+    @property
+    def guid(self) -> Optional[str]:
+        """Return the GUID of the topic."""
+        if self._markup:
+            return self.topic.guid
+        return self._topic_dir.name if self._topic_dir else None
+
+    @property
+    def header(self) -> Optional[mdl.Header]:
+        """Return the header of the topic."""
+        return self.markup.header
+
+    @property
+    def comments(self) -> list[mdl.Comment]:
+        """Return the comments of the topic."""
+        return self.topic.comments.comment if self.topic.comments else []
+
+    @property
+    def bim_snippet(self) -> Optional[bytes]:
+        if not self._bim_snippet and self._topic_dir:
+            self._bim_snippet = self._load_bim_snippet()
+        return self._bim_snippet
+
+    @bim_snippet.setter
+    def bim_snippet(self, value: bytes) -> None:
+        self._bim_snippet = value
+
+    @property
+    def viewpoints(self) -> dict[str, "VisualizationInfoHandler"]:
+        if (
+            not self._viewpoints
+            and self._topic_dir
+            and self.topic.viewpoints
+            and (viewpoints := self.topic.viewpoints.view_point)
+        ):
+            self._viewpoints = VisualizationInfoHandler.from_topic_viewpoints(self._topic_dir, viewpoints)
+        return self._viewpoints
+
+    def _load_bim_snippet(self) -> Optional[bytes]:
+        bim_snippet_obj = self.topic.bim_snippet
+        if bim_snippet_obj and not bim_snippet_obj.is_external and self._topic_dir:
+            bim_snippet_path = self._topic_dir.joinpath(bim_snippet_obj.reference)
+            if bim_snippet_path.exists():
+                return bim_snippet_path.read_bytes()
+        return None
+
+    @classmethod
+    def create_new(
+        cls,
+        title: str,
+        description: str,
+        author: str,
+        topic_type: str = "",
+        topic_status: str = "",
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "TopicHandler":
+        """
+        Create a new BCF topic.
+
+        Args:
+            title: The title of the topic.
+            description: The description of the topic.
+            author: The author of the topic.
+            topic_type: The type of the topic.
+            topic_status: The status of the topic.
+            xml_handler: The XML parser/serializer to use.
+
+        Returns:
+            The BCF topic definition.
+        """
+        creation_date = XmlDateTime.from_datetime(datetime.datetime.now())
+        guid = str(uuid.uuid4())
+        topic = mdl.Topic(
+            title=title,
+            description=description,
+            creation_author=author,
+            creation_date=creation_date,
+            guid=guid,
+            topic_type=topic_type,
+            topic_status=topic_status,
+        )
+        markup = mdl.Markup(topic=topic)
+        obj = cls(topic_dir=Path(guid), xml_handler=xml_handler or XmlParserSerializer())
+        obj.markup = markup
+        return obj
+
+    def save(self, destination_zip: ZipFileInterface) -> None:
+        """
+        Save the topic to a BCF zip file.
+
+        Args:
+            bcf_zip: The BCF zip file to save to.
+        """
+        topic_dir = self.guid
+        self._save_xml(destination_zip, self._markup, "markup.bcf")
+        self._save_viewpoints(destination_zip, topic_dir)
+        self._save_bim_snippet(destination_zip)
+
+    def _save_viewpoints(self, destination_zip: ZipFileInterface, topic_dir: str) -> None:
+        if not self.topic.viewpoints or not (viewpoints := self.topic.viewpoints.view_point):
+            return
+        for vpt in viewpoints:
+            if vpt.viewpoint:
+                self.viewpoints[vpt.viewpoint].save(destination_zip, topic_dir, vpt)
+
+    def _save_xml(self, destination_zip: ZipFileInterface, item: Any, target: str) -> None:
+        to_write = self._xml_handler.serialize(item) if item else self._topic_dir.joinpath(target).read_bytes()
+        destination_zip.writestr(f"{self._topic_dir.name}/{target}", to_write)
+
+    def _save_bim_snippet(self, destination_zip: ZipFileInterface) -> None:
+        snippet = self.topic.bim_snippet
+        if not snippet or snippet.is_external:
+            return
+        ref_filename = Path(snippet.reference).name
+        if self.bim_snippet:
+            destination_zip.writestr(f"{self.topic.guid}/{ref_filename}", self.bim_snippet)
+
+    def add_viewpoint(self, element: entity_instance) -> None:
+        """
+        Add a viewpoint tergeting an IFC element to the topic.
+
+        Args:
+            element: The IFC element.
+        """
+        new_viewpoint = VisualizationInfoHandler.create_new(element, self._xml_handler)
+        self.add_visinfo_handler(new_viewpoint)
+
+    def add_viewpoint_from_point_and_guids(self, position: NDArray[np.float_], *guids: str) -> None:
+        """
+        Add a viewpoint tergeting an IFC element to the topic.
+
+        Args:
+            element: The IFC element.
+        """
+        vi_handler = VisualizationInfoHandler.create_from_point_and_guids(
+            position, *guids, xml_handler=self._xml_handler
+        )
+        self.add_visinfo_handler(vi_handler)
+
+    def add_visinfo_handler(self, new_viewpoint: VisualizationInfoHandler) -> None:
+        self.viewpoints[new_viewpoint.guid + ".bcfv"] = new_viewpoint
+        if self.topic.viewpoints is None:
+            self.topic.viewpoints = mdl.TopicViewpoints()
+        self.topic.viewpoints.view_point.append(
+            mdl.ViewPoint(viewpoint=new_viewpoint.guid + ".bcfv", guid=new_viewpoint.guid)
+        )
+
+    def __eq__(self, other: object) -> bool | NoReturn:
+        return (
+            (
+                self.markup == other.markup
+                and self.viewpoints == other.viewpoints
+                and self.bim_snippet == other.bim_snippet
+            )
+            if isinstance(other, TopicHandler)
+            else NotImplemented
+        )
@@ -0,0 +1,294 @@
+import uuid
+import zipfile
+from functools import lru_cache
+from typing import Any, Iterable, Optional
+
+import numpy as np
+from ifcopenshell import entity_instance
+from ifcopenshell.util import placement
+from numpy.typing import NDArray
+
+import bcf.v3.model as mdl
+from bcf.geometry import (
+    camera_vectors_from_element_placement,
+    camera_vectors_from_target_position,
+)
+from bcf.inmemory_zipfile import ZipFileInterface
+from bcf.xml_parser import AbstractXmlParserSerializer, XmlParserSerializer
+
+
+class VisualizationInfoHandler:
+    """Handle the VisualizationInfo and related objects."""
+
+    def __init__(
+        self,
+        visualization_info: mdl.VisualizationInfo,
+        snapshot: Optional[bytes] = None,
+        bitmaps: Optional[dict[str, bytes]] = None,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> None:
+        self.visualization_info = visualization_info
+        self.snapshot = snapshot
+        self.bitmaps = bitmaps or {}
+        self._xml_handler = xml_handler or XmlParserSerializer()
+
+    @property
+    def guid(self) -> str:
+        """Return the GUID of the visualization info."""
+        return self.visualization_info.guid
+
+    @classmethod
+    def from_topic_viewpoints(
+        cls,
+        topic_dir: zipfile.Path,
+        vps: Iterable[mdl.ViewPoint],
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> dict[str, "VisualizationInfoHandler"]:
+        """Create VisualizationInfoHandler objects of a Topic's ViewPoints."""
+        viewpoints = {}
+        for vpt in vps:
+            visinfo = cls.load(topic_dir, vpt, xml_handler)
+            if visinfo and vpt.viewpoint:
+                viewpoints[vpt.viewpoint] = visinfo
+        return viewpoints
+
+    @classmethod
+    def load(
+        cls,
+        topic_dir: zipfile.Path,
+        vpt: mdl.ViewPoint,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> Optional["VisualizationInfoHandler"]:
+        """
+        Load the VisualizationInfo and related objects from a BCF zip file.
+
+        Args:
+            topic_dir: The directory in the BCF zip file to load from.
+            vpt: The ViewPoint to load.
+            xml_handler: The XML handler to use to parse the VisualizationInfo.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        visinfo = cls._load_visinfo(topic_dir, vpt.viewpoint, xml_handler)
+        if not visinfo:
+            return None
+        snapshot = cls._load_snapshot(topic_dir, vpt.snapshot)
+        bitmaps = cls._load_bitmaps(topic_dir, visinfo)
+        return cls(visinfo, snapshot, bitmaps, xml_handler)
+
+    @staticmethod
+    def _load_visinfo(
+        topic_dir: zipfile.Path,
+        vp_name: Optional[str],
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> Optional[mdl.VisualizationInfo]:
+        if not vp_name:
+            return None
+        vp_path = topic_dir.joinpath(vp_name)
+        if vp_path.exists():
+            xml_handler = xml_handler or XmlParserSerializer()
+            return xml_handler.parse(vp_path.read_bytes(), mdl.VisualizationInfo)
+        return None
+
+    @staticmethod
+    def _load_snapshot(topic_dir: zipfile.Path, vp_snapshot: Optional[str]) -> Optional[bytes]:
+        if vp_snapshot:
+            snapshot_path = topic_dir.joinpath(vp_snapshot)
+            if snapshot_path.exists():
+                return snapshot_path.read_bytes()
+        return None
+
+    @staticmethod
+    def _load_bitmaps(topic_dir: zipfile.Path, visinfo: Optional[mdl.VisualizationInfo]) -> dict[str, bytes]:
+        if not visinfo or not (bitmaps := visinfo.bitmaps):
+            return {}
+        bitmaps_dict = {}
+        for bitmap in bitmaps.bitmap:
+            if not bitmap.reference:
+                continue
+            bitmap_path = topic_dir.joinpath(bitmap.reference)
+            if bitmap_path.exists():
+                bitmaps_dict[bitmap.reference] = bitmap_path.read_bytes()
+        return bitmaps_dict
+
+    def save(
+        self,
+        bcf_zip: ZipFileInterface,
+        topic_dir: str,
+        vpt: mdl.ViewPoint,
+    ) -> None:
+        """
+        Save the VisualizationInfo and related objects to a BCF zip file.
+
+        Args:
+            bcf_zip: The BCF zip file to save to.
+            topic_dir: The directory in the BCF zip file to save to.
+            vpt: The ViewPoint to save.
+        """
+        if not (vp_name := vpt.viewpoint):
+            return
+        self._save_visinfo(bcf_zip, topic_dir, vp_name)
+        self._save_snapshot(bcf_zip, topic_dir, vpt.snapshot)
+        self._save_bitmaps(bcf_zip, topic_dir)
+
+    def _save_snapshot(self, bcf_zip: ZipFileInterface, topic_dir: str, filename: Optional[str]) -> None:
+        if self.snapshot and filename:
+            bcf_zip.writestr(f"{topic_dir}/{filename}", self.snapshot)
+
+    def _save_visinfo(self, bcf_zip: ZipFileInterface, topic_dir: str, vp_name: str) -> None:
+        bcf_zip.writestr(
+            f"{topic_dir}/{vp_name}",
+            self._xml_handler.serialize(self.visualization_info),
+        )
+
+    def _save_bitmaps(self, bcf_zip: ZipFileInterface, topic_dir: str) -> None:
+        if not self.bitmaps:
+            return
+        if not (bitmaps_defs := self.visualization_info.bitmaps):
+            return
+        for bitmap_def in bitmaps_defs.bitmap:
+            if not (bitmap_name := bitmap_def.reference):
+                continue
+            if bitmap_name in self.bitmaps:
+                bcf_zip.writestr(f"{topic_dir}/{bitmap_name}", self.bitmaps[bitmap_name])
+
+    @classmethod
+    def create_new(
+        cls,
+        element: entity_instance,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "VisualizationInfoHandler":
+        """
+        Create a new VisualizationInfoHandler object from an IFC element.
+
+        Args:
+            element: The IFC element to point at.
+            xml_handler: The XML handler to use.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        xml_handler = xml_handler or XmlParserSerializer()
+        return cls(visualization_info=build_viewpoint(element), xml_handler=xml_handler)
+
+    @classmethod
+    def create_from_point_and_guids(
+        cls,
+        position: NDArray[np.float_],
+        *guids: str,
+        xml_handler: Optional[AbstractXmlParserSerializer] = None,
+    ) -> "VisualizationInfoHandler":
+        """
+        Create a new VisualizationInfoHandler object from an IFC element.
+
+        Args:
+            position: target point coordinates.
+            *guids: One or more IFC element GUID.
+            xml_handler: The XML handler to use.
+
+        Returns:
+            The VisualizationInfoHandler object.
+        """
+        xml_handler = xml_handler or XmlParserSerializer()
+        return cls(
+            visualization_info=build_viewpoint_from_position_and_guids(position, *guids), xml_handler=xml_handler
+        )
+
+
+@lru_cache(maxsize=None)
+def build_viewpoint(element: entity_instance) -> mdl.VisualizationInfo:
+    """
+    Return a BCF viewpoint of an IFC element.
+
+    This function is cached to speedudp the creation of multiple BCF topics regarding the same element.
+
+    Args:
+        element: The IFC element to point at.
+
+    Returns:
+        The BCF viewpoint definition.
+    """
+    elem_placement = placement.get_local_placement(element.ObjectPlacement)
+
+    return mdl.VisualizationInfo(
+        guid=str(uuid.uuid4()),
+        components=build_components(element.GlobalId),
+        perspective_camera=build_camera(elem_placement),
+    )
+
+
+def build_viewpoint_from_position_and_guids(position: NDArray[np.float_], *guids: str) -> mdl.VisualizationInfo:
+    """
+    Return a BCF viewpoint of an IFC element.
+
+    This function is cached to speedudp the creation of multiple BCF topics regarding the same element.
+
+    Args:
+        position: target point coordinates.
+        *guids: One or more IFC element GUID.
+
+    Returns:
+        The BCF viewpoint definition.
+    """
+    return mdl.VisualizationInfo(
+        guid=str(uuid.uuid4()),
+        components=build_components(*guids),
+        perspective_camera=build_camera_from_vectors(*camera_vectors_from_target_position(position)),
+    )
+
+
+def build_components(*guids: str) -> mdl.Components:
+    """
+    Return the BCF components from an IFC element GUID.
+
+    Args:
+        *guids: One or more IFC element GUID.
+
+    Returns:
+        The BCF components definition.
+    """
+    components = [mdl.Component(ifc_guid=guid) for guid in guids]
+    return mdl.Components(
+        selection=mdl.ComponentSelection(component=components),
+        visibility=mdl.ComponentVisibility(default_visibility=True),
+    )
+
+
+def build_camera(elem_placement: NDArray[np.float_]) -> mdl.PerspectiveCamera:
+    """
+    Return a BCF camera for an IFC element placement matrix.
+
+    Args:
+        elem_placement: The IFC element placement as a rototranslation matrix.
+
+    Returns:
+        The BCF camera definition.
+    """
+    return build_camera_from_vectors(*camera_vectors_from_element_placement(elem_placement))
+
+
+def build_camera_from_vectors(
+    camera_position: NDArray[np.float_], camera_dir: NDArray[np.float_], camera_up: NDArray[np.float_]
+) -> mdl.PerspectiveCamera:
+    """
+    Return a BCF camera for an IFC element placement matrix.
+
+    Args:
+        camera_position: camera position array
+        camera_dir: camera direction versor
+        camera_up_vector: camera up versor
+
+    Returns:
+        The BCF camera definition.
+    """
+    camera_viewpoint = mdl.Point(x=camera_position[0], y=camera_position[1], z=camera_position[2])
+    camera_direction = mdl.Direction(x=camera_dir[0], y=camera_dir[1], z=camera_dir[2])
+    camera_up_vector = mdl.Direction(x=camera_up[0], y=camera_up[1], z=camera_up[2])
+    return mdl.PerspectiveCamera(
+        camera_view_point=camera_viewpoint,
+        camera_direction=camera_direction,
+        camera_up_vector=camera_up_vector,
+        aspect_ratio=1.0,
+        field_of_view=60.0,
+    )
@@ -0,0 +1,83 @@
+"""XML Parser and Serializer factories."""
+from typing import Optional, Protocol, Type, TypeVar
+
+from xsdata.formats.dataclass.context import XmlContext
+from xsdata.formats.dataclass.parsers import XmlParser
+from xsdata.formats.dataclass.serializers import XmlSerializer
+from xsdata.formats.dataclass.serializers.config import SerializerConfig
+
+
+def build_xml_parser(context: Optional[XmlContext] = None) -> XmlParser:
+    """Return a parser for an XML file."""
+    parser = XmlParser(context=context or XmlContext())
+    parser.register_namespace("xs", "http://www.w3.org/2001/XMLSchema")
+    return parser
+
+
+def build_serializer(context: Optional[XmlContext] = None) -> XmlSerializer:
+    """Return a serializer for an XML file."""
+    return XmlSerializer(
+        config=SerializerConfig(pretty_print=True),
+        context=context or XmlContext(),
+    )
+
+
+T = TypeVar("T")
+
+
+class AbstractXmlParserSerializer(Protocol):
+    """XML Parser and serializer wrapper."""
+
+    def parse(self, xml: bytes, clazz: Type[T]) -> T:
+        """
+        Parse an XML file to an object.
+
+        Args:
+            xml: The XML file as bytes.
+            clazz: The class to parse to.
+        """
+
+    def serialize(self, obj: T, ns_map: Optional[dict[str, str]] = None) -> str:
+        """
+        Serialize an object to XML.
+
+        Args:
+            obj: The object to serialize.
+            ns_map: The namespace map to use.
+
+        Returns:
+            The XML as string.
+        """
+
+
+class XmlParserSerializer:
+    """XML Parser and serializer wrapper."""
+
+    def __init__(self) -> None:
+        self.context = XmlContext()
+        self.parser = build_xml_parser(self.context)
+        self.serializer = build_serializer(self.context)
+
+    def parse(self, xml: bytes, clazz: Type[T]) -> T:
+        """
+        Parse an XML file to an object.
+
+        Args:
+            xml: The XML file as bytes.
+            clazz: The class to parse to.
+        """
+        return self.parser.from_bytes(xml, clazz)
+
+    def serialize(self, obj: T, ns_map: Optional[dict[str, str]] = None) -> str:
+        """
+        Serialize an object to XML.
+
+        Args:
+            obj: The object to serialize.
+            ns_map: The namespace map to use.
+
+        Returns:
+            The XML as string.
+        """
+        ns_map = ns_map or {"xs": "http://www.w3.org/2001/XMLSchema"}
+        return self.serializer.render(obj, ns_map)
@@ -0,0 +1 @@
+"""BCF tests."""
@@ -0,0 +1,8 @@
+import pytest
+
+from bcf.xml_parser import XmlParserSerializer
+
+
+@pytest.fixture(scope="session")
+def xml_handler() -> XmlParserSerializer:
+    return XmlParserSerializer()
@@ -0,0 +1,126 @@
+"""BCF XML tests."""
+import uuid
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pytest
+
+import bcf.v2.model as mdl
+from bcf.v2.bcfxml import BcfXml
+from bcf.v2.topic import TopicHandler
+from bcf.v2.visinfo import (
+    VisualizationInfoHandler,
+    build_camera_from_vectors,
+    build_components,
+)
+from bcf.xml_parser import XmlParserSerializer
+
+
+@pytest.fixture()
+def build_sample(xml_handler: XmlParserSerializer) -> tuple[BcfXml, TopicHandler]:
+    bcf = BcfXml.create_new("Test project", xml_handler=xml_handler)
+    orig_th = bcf.add_topic("Test topic", "Test message", "Test author", "Test type")
+    return bcf, orig_th
+
+
+def test_bcf_roundtrip(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            assert parsed == bcf
+            parsed_th = parsed.topics[orig_th.guid]
+            assert parsed_th == orig_th
+
+
+def test_bcf_edit_saveas(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            for th in parsed.topics.values():
+                th.topic.title = "New Topic Title"
+            modified_path = Path(tmp_dir) / "edited.bcf"
+            parsed.save(modified_path)
+            with BcfXml.load(modified_path, xml_handler=xml_handler) as modified_parsed:
+                _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed)
+
+
+def _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed):
+    assert modified_parsed == bcf
+    parsed_th = modified_parsed.topics[orig_th.guid]
+    assert parsed_th.markup != orig_th.markup
+    assert parsed_th.markup == parsed.topics[orig_th.guid].markup
+    assert parsed_th.viewpoints == orig_th.viewpoints
+    assert parsed_th.bim_snippet == orig_th.bim_snippet
+
+
+def test_bcf_edit(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            for th in parsed.topics.values():
+                th.topic.title = "New Topic Title"
+            parsed.save()
+            with BcfXml.load(file_path, xml_handler=xml_handler) as modified_parsed:
+                _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed)
+                assert len(modified_parsed.topics) == 1
+
+
+def test_save_no_filename(build_sample) -> None:
+    bcf, _ = build_sample
+    with pytest.raises(ValueError):
+        bcf.save()
+
+
+def test_load_no_filename() -> None:
+    with pytest.raises(ValueError):
+        BcfXml.load("")
+
+
+def test_save_keep_open(build_sample) -> None:
+    bcf, _ = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path, keep_open=True)
+        assert bcf._zip_file is not None
+        bcf._zip_file.close()
+
+
+def test_massive_bcf(xml_handler) -> None:
+    bcf = BcfXml.create_new("Test project", xml_handler=xml_handler)
+    for i in range(100):
+        th = bcf.add_topic(f"Topic {i:04}", f"Message {i:04}", "Test author", "Test type")
+        vi = mdl.VisualizationInfo(
+            guid=str(uuid.uuid4()),
+            components=build_components(str(uuid.uuid4())),
+            perspective_camera=build_camera_from_vectors([i, 0, 0], [0, 1, 0], [0, 0, 1]),
+        )
+        vh = VisualizationInfoHandler(visualization_info=vi, xml_handler=xml_handler)
+        th.add_visinfo_handler(vh)
+    assert len(bcf.topics) == 100
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+
+
+def test_equality_with_wrong_object(build_sample) -> None:
+    assert build_sample[0] != "Wrong object"
+
+
+def test_topic_equality_with_wrong_object(build_sample) -> None:
+    assert build_sample[1] != "Wrong object"
+
+
+def test_bcf_get_set_version(build_sample) -> None:
+    bcf = build_sample[0]
+    assert bcf.version.version_id == "2.1"
+    bcf.version.version_id = "2.0"
+    assert bcf.version.version_id == "2.0"
@@ -0,0 +1,365 @@
+import json
+import os
+import zipfile
+from pathlib import Path
+
+from xsdata.models.datatype import XmlDateTime
+
+import bcf.v2.model as mdl
+from bcf.v2.bcfxml import BcfXml
+from bcf.v2.topic import TopicHandler
+
+
+def test_maximum_information() -> None:
+    """
+    All the info in a BCF is parsed correctly.
+
+    Uses sample file from https://github.com/buildingSMART/BCF-XML/
+    """
+    bcf_path = Path(__file__).parent / "MaximumInformation.bcf"
+    with BcfXml.load(bcf_path) as bcf:
+        assert_everything_in_place(bcf)
+
+
+def test_save_maximum_information() -> None:
+    base_dir = Path(__file__).parent
+    bcf_path = base_dir / "MaximumInformation.bcf"
+    target_path = base_dir / "MaximumInformationSaved.bcf"
+    with BcfXml.load(bcf_path) as bcf:
+        bcf.save(target_path)
+    assert target_path.exists()
+    with BcfXml.load(target_path) as bcf2:
+        assert_everything_in_place(bcf2)
+
+    expected_files = [
+        "bcf.version",
+        "project.bcfp",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/markup.bcf",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/bitmap.png",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/tux.png",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/JsonElement.json",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Viewpoint_4ab7514b-b216-4d56-98d2-45cf8500ff5a.bcfv",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Viewpoint_9a4a1878-ecbd-4916-83a8-dad82e560231.bcfv",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Viewpoint_fc4019d7-365e-47f3-b6d0-b39fc48f15fc.bcfv",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Snapshot_4ab7514b-b216-4d56-98d2-45cf8500ff5a.png",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Snapshot_9a4a1878-ecbd-4916-83a8-dad82e560231.png",
+        "7ddc3ef0-0ab7-43f1-918a-45e38b42369c/Snapshot_fc4019d7-365e-47f3-b6d0-b39fc48f15fc.png",
+        "d1068c81-af04-4546-b63c-348810f6c716/markup.bcf",
+        "extensions.xsd",
+        "IfcPile_01.ifc",
+        "markup.xsd",
+    ]
+    assert_files_present(target_path, expected_files)
+    os.unlink(target_path)
+
+
+def assert_everything_in_place(bcf: BcfXml):
+    assert bcf.version.version_id == "2.1"
+    assert bcf.project.name == "BCF API Implementation"
+    assert bcf.project_info.extension_schema == "extensions.xsd"
+
+    assert len(bcf.topics) == 2
+    assert_first_topic_handler(bcf.topics["7ddc3ef0-0ab7-43f1-918a-45e38b42369c"])
+    second_th = bcf.topics["d1068c81-af04-4546-b63c-348810f6c716"]
+    assert second_th.topic == mdl.Topic(
+        title="Referenced topic",
+        creation_date=XmlDateTime(2017, 5, 22, 7, 51, 0, 42987900),
+        creation_author="dangl@iabi.eu",
+        description="This is just an empty topic that acts as a referenced topic.",
+        guid="d1068c81-af04-4546-b63c-348810f6c716",
+    )
+
+
+def assert_first_topic_handler(topic_handler: TopicHandler):
+    assert topic_handler.guid == "7ddc3ef0-0ab7-43f1-918a-45e38b42369c"
+
+    expected_bs1 = mdl.BimSnippet(
+        reference="JsonElement.json", reference_schema="http://json-schema.org", snippet_type="JSON"
+    )
+    expected_t1 = mdl.Topic(
+        reference_link=["https://bim--it.net"],
+        title="Maximum Content",
+        priority="High",
+        index=0,
+        labels=["Structural", "IT Development"],
+        creation_date=XmlDateTime(2015, 6, 21, 12, 0, 0),
+        creation_author="dangl@iabi.eu",
+        modified_date=XmlDateTime(2015, 6, 21, 14, 22, 47),
+        modified_author="dangl@iabi.eu",
+        due_date=XmlDateTime(2016, 10, 2, 14, 22, 47),
+        assigned_to="linhard@iabi.eu",
+        stage="Construction Start",
+        description="This is a topic with all informations present.",
+        bim_snippet=expected_bs1,
+        document_reference=[
+            mdl.TopicDocumentReference(
+                referenced_document="https://github.com/BuildingSMART/BCF-XML",
+                description="GitHub BCF Specification",
+                is_external=True,
+            ),
+            mdl.TopicDocumentReference(
+                referenced_document="../markup.xsd",
+                description="Markup.xsd Schema",
+                is_external=False,
+            ),
+        ],
+        related_topic=[mdl.TopicRelatedTopic(guid="d1068c81-af04-4546-b63c-348810f6c716")],
+        guid="7ddc3ef0-0ab7-43f1-918a-45e38b42369c",
+        topic_type="Structural",
+        topic_status="Open",
+    )
+    assert topic_handler.topic == expected_t1
+    expected_h1 = mdl.Header(
+        file=[
+            mdl.HeaderFile(
+                filename="IfcPile_01.ifc",
+                date=XmlDateTime(2014, 10, 27, 16, 27, 27),
+                reference="../IfcPile_01.ifc",
+                ifc_project="0M6o7Znnv7hxsbWgeu7oQq",
+                ifc_spatial_structure_element="23B$bNeGHFQuMYJzvUX0FD",
+                is_external=False,
+            )
+        ]
+    )
+    assert topic_handler.header == expected_h1
+
+    expected_th1_comments = [
+        mdl.Comment(
+            date=XmlDateTime(2015, 8, 31, 12, 40, 17),
+            author="dangl@iabi.eu",
+            comment="This is an unmodified topic at the uppermost hierarchical level.\nAll times in the XML are marked as UTC times.",
+            guid="07ccdba0-1736-47e1-807d-67dc6f3addaa",
+        ),
+        mdl.Comment(
+            date=XmlDateTime(2015, 8, 31, 14, 0, 1),
+            author="dangl@iabi.eu",
+            comment="This comment was a reply to the first comment in BCF v2.0. This is a no longer supported functionality and therefore is to be treated as a regular comment in v2.1.",
+            guid="a12766c2-61bc-40b4-ab19-e9f45fd0b0bf",
+        ),
+        mdl.Comment(
+            date=XmlDateTime(2015, 8, 31, 13, 7, 11),
+            author="dangl@iabi.eu",
+            comment="This comment again is in the highest hierarchy level.\nIt references a viewpoint.",
+            viewpoint=mdl.CommentViewpoint(guid="4ab7514b-b216-4d56-98d2-45cf8500ff5a"),
+            guid="c2bb5bb0-773d-45dd-bdaa-19a216439ed3",
+        ),
+        mdl.Comment(
+            date=XmlDateTime(2015, 8, 31, 15, 42, 58),
+            author="dangl@iabi.eu",
+            comment="This comment contained some spllng errs.\nHopefully, the modifier did catch them all.",
+            modified_date=XmlDateTime(2015, 8, 31, 16, 7, 11),
+            modified_author="dangl@iabi.eu",
+            guid="0b843a5c-c3bf-41ef-be98-52a9f7bd9790",
+        ),
+    ]
+    assert topic_handler.comments == expected_th1_comments
+
+    expected_th1_viewpoints = [
+        mdl.ViewPoint(
+            viewpoint="Viewpoint_4ab7514b-b216-4d56-98d2-45cf8500ff5a.bcfv",
+            snapshot="Snapshot_4ab7514b-b216-4d56-98d2-45cf8500ff5a.png",
+            index=2,
+            guid="4ab7514b-b216-4d56-98d2-45cf8500ff5a",
+        ),
+        mdl.ViewPoint(
+            viewpoint="Viewpoint_fc4019d7-365e-47f3-b6d0-b39fc48f15fc.bcfv",
+            snapshot="Snapshot_fc4019d7-365e-47f3-b6d0-b39fc48f15fc.png",
+            index=0,
+            guid="fc4019d7-365e-47f3-b6d0-b39fc48f15fc",
+        ),
+        mdl.ViewPoint(
+            viewpoint="Viewpoint_9a4a1878-ecbd-4916-83a8-dad82e560231.bcfv",
+            snapshot="Snapshot_9a4a1878-ecbd-4916-83a8-dad82e560231.png",
+            index=1,
+            guid="9a4a1878-ecbd-4916-83a8-dad82e560231",
+        ),
+    ]
+
+    expected_m1 = mdl.Markup(
+        header=expected_h1,
+        topic=expected_t1,
+        comment=expected_th1_comments,
+        viewpoints=expected_th1_viewpoints,
+    )
+    assert topic_handler.markup == expected_m1
+
+    assert json.loads(topic_handler.bim_snippet) == {"Material": "Concrete", "Temperatures": ["Cold", "Hot", "Hotter"]}
+
+    assert topic_handler.reference_files["../IfcPile_01.ifc"] is not None
+
+    assert_viewpoints(topic_handler.viewpoints)
+
+
+def assert_viewpoints(viewpoints):
+    assert len(viewpoints) == 3
+
+    expected_selection = mdl.ComponentSelection(
+        component=[
+            mdl.Component(ifc_guid="0cSRUx$EX1NRjqiKcYQ$a0"),
+            mdl.Component(ifc_guid="1jQQiGIAnFzxOUzrdmJYDS"),
+            mdl.Component(ifc_guid="0fdpeZZEX3FwJ7x0ox5kzF"),
+            mdl.Component(ifc_guid="23Zwlpd71EyvHlH6OZ77nK"),
+            mdl.Component(ifc_guid="1OpjQ1Nlv4sQuTxfUC_8zS"),
+        ]
+    )
+
+    expected_exception = mdl.ComponentVisibilityExceptions(
+        component=[
+            mdl.Component(ifc_guid="0Gl71cVurFn8bxAOox6M4X"),
+            mdl.Component(ifc_guid="23Zwlpd71EyvHlH6OZ77nK"),
+            mdl.Component(ifc_guid="3DvyPxGIn8qR0KDwbL_9r1"),
+            mdl.Component(ifc_guid="0fdpeZZEX3FwJ7x0ox5kzF"),
+            mdl.Component(ifc_guid="1OpjQ1Nlv4sQuTxfUC_8zS"),
+        ]
+    )
+
+    expected_coloring = mdl.ComponentColoring(
+        color=[
+            mdl.ComponentColoringColor(
+                component=[
+                    mdl.Component(ifc_guid="0fdpeZZEX3FwJ7x0ox5kzF"),
+                    mdl.Component(ifc_guid="23Zwlpd71EyvHlH6OZ77nK"),
+                    mdl.Component(ifc_guid="1OpjQ1Nlv4sQuTxfUC_8zS"),
+                    mdl.Component(ifc_guid="0cSRUx$EX1NRjqiKcYQ$a0"),
+                ],
+                color="3498DB",
+            )
+        ]
+    )
+
+    assert_first_viewpoint(
+        viewpoints["Viewpoint_4ab7514b-b216-4d56-98d2-45cf8500ff5a.bcfv"],
+        expected_selection,
+        expected_exception,
+        expected_coloring,
+    )
+    assert_second_viewpoint(
+        viewpoints["Viewpoint_fc4019d7-365e-47f3-b6d0-b39fc48f15fc.bcfv"],
+        expected_selection,
+        expected_exception,
+        expected_coloring,
+    )
+    assert_third_viewpoint(
+        viewpoints["Viewpoint_9a4a1878-ecbd-4916-83a8-dad82e560231.bcfv"],
+        expected_selection,
+        expected_exception,
+        expected_coloring,
+    )
+
+
+def assert_first_viewpoint(viewpoint, expected_selection, expected_exception, expected_coloring) -> None:
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            view_setup_hints=mdl.ViewSetupHints(
+                spaces_visible=True,
+                space_boundaries_visible=True,
+                openings_visible=True,
+            ),
+            selection=expected_selection,
+            visibility=mdl.ComponentVisibility(
+                exceptions=expected_exception,
+                default_visibility=True,
+            ),
+            coloring=expected_coloring,
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=0.43079984188079834, y=69.52057647705078, z=10.666350364685059),
+            camera_direction=mdl.Direction(x=0.09159398823976517, y=-0.9375035166740417, z=-0.3357048034667969),
+            camera_up_vector=mdl.Direction(x=0.01938679628074169, y=-0.3353792130947113, z=0.9418837428092957),
+            field_of_view=60,
+        ),
+        lines=mdl.VisualizationInfoLines(
+            line=[
+                mdl.Line(start_point=mdl.Point(x=0, y=0, z=0), end_point=mdl.Point(x=0, y=0, z=1)),
+                mdl.Line(start_point=mdl.Point(x=0, y=0, z=1), end_point=mdl.Point(x=0, y=1, z=1)),
+                mdl.Line(start_point=mdl.Point(x=0, y=1, z=1), end_point=mdl.Point(x=1, y=1, z=1)),
+            ]
+        ),
+        clipping_planes=mdl.VisualizationInfoClippingPlanes(
+            clipping_plane=[
+                mdl.ClippingPlane(location=mdl.Point(x=0, y=0, z=0), direction=mdl.Direction(x=0, y=0, z=1)),
+                mdl.ClippingPlane(location=mdl.Point(x=0, y=0, z=0), direction=mdl.Direction(x=0, y=1, z=0)),
+            ]
+        ),
+        bitmap=[
+            mdl.VisualizationInfoBitmap(
+                bitmap=mdl.BitmapFormat.PNG,
+                reference="bitmap.png",
+                location=mdl.Point(x=10, y=-10, z=7),
+                normal=mdl.Direction(x=0, y=1, z=0),
+                up=mdl.Direction(x=0, y=0, z=1),
+                height=5.0,
+            ),
+            mdl.VisualizationInfoBitmap(
+                bitmap=mdl.BitmapFormat.PNG,
+                reference="tux.png",
+                location=mdl.Point(x=20, y=-10, z=7),
+                normal=mdl.Direction(x=0, y=1, z=0),
+                up=mdl.Direction(x=0, y=0, z=1),
+                height=5.0,
+            ),
+        ],
+        guid="8dc86298-9737-40b4-a448-98a9e953293a",
+    )
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_second_viewpoint(viewpoint, expected_selection, expected_exception, expected_coloring) -> None:
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            view_setup_hints=mdl.ViewSetupHints(
+                spaces_visible=False,
+                space_boundaries_visible=False,
+                openings_visible=False,
+            ),
+            selection=expected_selection,
+            visibility=mdl.ComponentVisibility(
+                exceptions=expected_exception,
+                default_visibility=False,
+            ),
+            coloring=expected_coloring,
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=-47.18794250488281, y=43.829200744628906, z=10.666350364685059),
+            camera_direction=mdl.Direction(x=0.6745243072509766, y=-0.6599355936050415, z=-0.33091068267822266),
+            camera_up_vector=mdl.Direction(x=0.2271970510482788, y=-0.24091780185699463, z=0.9435783624649048),
+            field_of_view=60,
+        ),
+        guid="21dd4807-e9af-439e-a980-04d913a6b1ce",
+    )
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_third_viewpoint(viewpoint, expected_selection, expected_exception, expected_coloring) -> None:
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            view_setup_hints=mdl.ViewSetupHints(
+                spaces_visible=False,
+                space_boundaries_visible=False,
+                openings_visible=True,
+            ),
+            selection=expected_selection,
+            visibility=mdl.ComponentVisibility(
+                exceptions=expected_exception,
+                default_visibility=True,
+            ),
+            coloring=expected_coloring,
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=-48.974571228027344, y=-64.20051574707031, z=10.666350364685059),
+            camera_direction=mdl.Direction(x=0.7232745289802551, y=0.5967116951942444, z=-0.3475759029388428),
+            camera_up_vector=mdl.Direction(x=0.27662187814712524, y=0.21082592010498047, z=0.937567412853241),
+            field_of_view=60,
+        ),
+        guid="81daa431-bf01-4a49-80a2-1ab07c177717",
+    )
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_files_present(saved_bcf_path, expected_files):
+    with zipfile.ZipFile(saved_bcf_path) as bcf_zip:
+        for file_path in expected_files:
+            assert zipfile.Path(bcf_zip, file_path).exists()
@@ -0,0 +1,36 @@
+import numpy as np
+import pytest
+
+from bcf.v2.bcfxml import BcfXml
+
+
+def test_create_clash_set_bcf() -> None:
+    bcfxml = BcfXml.create_new("Clash Test")
+    topic = bcfxml.add_topic("Test", "Test topic", "IfcClash")
+    topic.add_viewpoint_from_point_and_guids(
+        np.array([10, 10, 10]),
+        "firstId",
+        "secondId",
+    )
+    assert len(topic.viewpoints) == 1
+    guid, vi_handler = next((k, v) for k, v in topic.viewpoints.items())
+    v_info = vi_handler.visualization_info
+    assert f"{v_info.guid}.bcfv" == guid
+    components = v_info.components.selection.component
+    assert {c.ifc_guid for c in components} == {"firstId", "secondId"}
+    camera = v_info.perspective_camera
+    viewpoint = camera.camera_view_point
+    assert viewpoint.x == 15
+    assert viewpoint.y == 15
+    assert viewpoint.z == 15
+    # default direction is the unit vector of -1, -1, -1
+    direction = camera.camera_direction
+    assert direction.x == pytest.approx(-1 / 3**0.5)
+    assert direction.y == pytest.approx(-1 / 3**0.5)
+    assert direction.z == pytest.approx(-1 / 3**0.5)
+    # default
+    up_vector = camera.camera_up_vector
+    assert up_vector.x == pytest.approx(-1 / 6**0.5)
+    assert up_vector.y == pytest.approx(-1 / 6**0.5)
+    assert up_vector.z == pytest.approx(1 / 1.5**0.5)
+    assert camera.field_of_view == 60
@@ -0,0 +1,121 @@
+"""BCF XML tests."""
+import uuid
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pytest
+
+import bcf.v3.model as mdl
+from bcf.v3.bcfxml import BcfXml
+from bcf.v3.topic import TopicHandler
+from bcf.v3.visinfo import (
+    VisualizationInfoHandler,
+    build_camera_from_vectors,
+    build_components,
+)
+from bcf.xml_parser import XmlParserSerializer
+
+
+@pytest.fixture()
+def build_sample(xml_handler: XmlParserSerializer) -> tuple[BcfXml, TopicHandler]:
+    ext = mdl.Extensions(topic_types=mdl.ExtensionsTopicTypes(topic_type=["Test type"]))
+    bcf = BcfXml.create_new("Test project", extensions=ext, xml_handler=xml_handler)
+    orig_th = bcf.add_topic("Test topic", "Test message", "Test author", "Test type")
+    return bcf, orig_th
+
+
+def test_bcf_roundtrip(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            assert parsed == bcf
+            parsed_th = parsed.topics[orig_th.guid]
+            assert parsed_th == orig_th
+
+
+def test_bcf_edit_saveas(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            for th in parsed.topics.values():
+                th.topic.title = "New Topic Title"
+            modified_path = Path(tmp_dir) / "edited.bcf"
+            parsed.save(modified_path)
+            with BcfXml.load(modified_path, xml_handler=xml_handler) as modified_parsed:
+                _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed)
+
+
+def _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed):
+    assert modified_parsed == bcf
+    parsed_th = modified_parsed.topics[orig_th.guid]
+    assert parsed_th.markup != orig_th.markup
+    assert parsed_th.markup == parsed.topics[orig_th.guid].markup
+    assert parsed_th.viewpoints == orig_th.viewpoints
+    assert parsed_th.bim_snippet == orig_th.bim_snippet
+
+
+def test_bcf_edit(xml_handler, build_sample) -> None:
+    """Saving and loading a bcf xml project returns the same objects."""
+    bcf, orig_th = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+        with BcfXml.load(file_path, xml_handler=xml_handler) as parsed:
+            for th in parsed.topics.values():
+                th.topic.title = "New Topic Title"
+            parsed.save()
+            with BcfXml.load(file_path, xml_handler=xml_handler) as modified_parsed:
+                _assert_modified_parsed(modified_parsed, bcf, orig_th, parsed)
+                assert len(modified_parsed.topics) == 1
+
+
+def test_save_no_filename(build_sample) -> None:
+    bcf, _ = build_sample
+    with pytest.raises(ValueError):
+        bcf.save()
+
+
+def test_load_no_filename() -> None:
+    with pytest.raises(ValueError):
+        BcfXml.load("")
+
+
+def test_save_keep_open(build_sample) -> None:
+    bcf, _ = build_sample
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path, keep_open=True)
+        assert bcf._zip_file is not None
+        bcf._zip_file.close()
+
+
+def test_massive_bcf(xml_handler) -> None:
+    ext = mdl.Extensions(topic_types=mdl.ExtensionsTopicTypes(topic_type=["Test type"]))
+    bcf = BcfXml.create_new("Test project", extensions=ext, xml_handler=xml_handler)
+    for i in range(100):
+        th = bcf.add_topic(f"Topic {i:04}", f"Message {i:04}", "Test author", "Test type")
+        vi = mdl.VisualizationInfo(
+            guid=str(uuid.uuid4()),
+            components=build_components(str(uuid.uuid4())),
+            perspective_camera=build_camera_from_vectors([i, 0, 0], [0, 1, 0], [0, 0, 1]),
+        )
+        vh = VisualizationInfoHandler(visualization_info=vi, xml_handler=xml_handler)
+        th.add_visinfo_handler(vh)
+    assert len(bcf.topics) == 100
+    with TemporaryDirectory() as tmp_dir:
+        file_path = Path(tmp_dir) / "test.bcf"
+        bcf.save(file_path)
+
+
+def test_equality_with_wrong_object(build_sample) -> None:
+    assert build_sample[0] != "Wrong object"
+
+
+def test_topic_equality_with_wrong_object(build_sample) -> None:
+    assert build_sample[1] != "Wrong object"
@@ -0,0 +1,230 @@
+import json
+import os
+import zipfile
+from pathlib import Path
+
+from xsdata.models.datatype import XmlDateTime
+
+import bcf.v3.model as mdl
+from bcf.v3.bcfxml import BcfXml
+from bcf.v3.topic import TopicHandler
+
+
+def test_doc_ref_internal() -> None:
+    """
+    All the info in a BCF is parsed correctly.
+
+    Uses sample file from https://github.com/buildingSMART/BCF-XML/
+    """
+    bcf_path = Path(__file__).parent / "Document reference internal.bcf"
+    with BcfXml.load(bcf_path) as bcf:
+        assert_everything_in_place(bcf)
+
+
+def test_doc_ref_internal_save() -> None:
+    base_dir = Path(__file__).parent
+    bcf_path = base_dir / "Document reference internal.bcf"
+    target_path = base_dir / "Document reference internal Saved.bcf"
+    with BcfXml.load(bcf_path) as bcf:
+        bcf.save(target_path)
+    assert target_path.exists()
+    with BcfXml.load(target_path) as bcf2:
+        assert_everything_in_place(bcf2)
+    assert_files_present(target_path)
+    os.unlink(target_path)
+
+
+def assert_everything_in_place(bcf: BcfXml):
+    assert bcf.version.version_id == "3.0"
+    assert bcf.project.name == "BCF 3.0 test cases"
+    assert bcf.project.project_id == "de894a86-3a08-4ea0-b2d1-6c222b5602d1"
+
+    assert len(bcf.topics) == 1
+    topic_handler = bcf.topics["8ac9822a-761a-4deb-9f39-f61286acbf6a"]
+
+    expected_h1 = mdl.Header(
+        files=mdl.HeaderFiles(
+            file=[
+                mdl.File(
+                    filename="BCF-ARK",
+                    date=XmlDateTime(2021, 1, 4, 9, 37, 45),
+                    reference="https://bimsync.com/project/f5fbb3c695274d1890036bf64f77eb71/revisions/007afab57f264d2296aae0a452486ae1",
+                    is_external=True,
+                ),
+                mdl.File(
+                    filename="BCF-MEP",
+                    date=XmlDateTime(2017, 8, 7, 9, 51, 34),
+                    reference="https://bimsync.com/project/f5fbb3c695274d1890036bf64f77eb71/revisions/a21ed391f9e046a2bb2bc879c48f1d48",
+                    is_external=True,
+                ),
+            ]
+        )
+    )
+    assert topic_handler.header == expected_h1
+
+    expected_comments = [
+        mdl.Comment(
+            date=XmlDateTime(2021, 2, 17, 9, 16, 4, 160_000_000),
+            author="Architect@example.com",
+            comment="A comment",
+            viewpoint=mdl.CommentViewpoint(guid="20ad2ff7-ceac-4d4b-b288-ad92a0f65182"),
+            guid="c045ef04-324d-4c36-9ac8-831f2a15c6d6",
+        ),
+    ]
+    assert topic_handler.comments == expected_comments
+
+    expected_viewpoints = [
+        mdl.ViewPoint(
+            viewpoint="Viewpoint_20ad2ff7-ceac-4d4b-b288-ad92a0f65182.bcfv",
+            snapshot="Snapshot_20ad2ff7-ceac-4d4b-b288-ad92a0f65182.png",
+            guid="20ad2ff7-ceac-4d4b-b288-ad92a0f65182",
+        ),
+    ]
+
+    expected_topic = mdl.Topic(
+        reference_links=mdl.TopicReferenceLinks(),
+        title="Document Reference Internal",
+        labels=mdl.TopicLabels(),
+        creation_date=XmlDateTime(2021, 2, 17, 9, 16, 4, 160_000_000),
+        creation_author="Architect@example.com",
+        modified_date=XmlDateTime(2021, 2, 17, 9, 16, 4, 160_000_000),
+        assigned_to="OtherUser@doe.com",
+        document_references=mdl.TopicDocumentReferences(
+            document_reference=[
+                mdl.DocumentReference(
+                    document_guid="b1d1b7f0-60b9-457d-ad12-16e0fb997bc5",
+                    description="ThisIsADocument.txt",
+                    guid="048e898f-555f-47c3-a273-6c664fb2ef69",
+                ),
+            ],
+        ),
+        related_topics=mdl.TopicRelatedTopics(),
+        comments=mdl.TopicComments(comment=expected_comments),
+        viewpoints=mdl.TopicViewpoints(view_point=expected_viewpoints),
+        guid="8ac9822a-761a-4deb-9f39-f61286acbf6a",
+        server_assigned_id="6",
+        topic_type="ERROR",
+        topic_status="OPEN",
+    )
+    assert topic_handler.topic == expected_topic
+
+    expected_m1 = mdl.Markup(
+        header=expected_h1,
+        topic=expected_topic,
+    )
+    assert topic_handler.markup == expected_m1
+
+    assert topic_handler.bim_snippet is None
+
+    assert_viewpoints(topic_handler.viewpoints)
+
+
+def assert_viewpoints(viewpoints):
+    assert len(viewpoints) == 1
+
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            selection=mdl.ComponentSelection(),
+            visibility=mdl.ComponentVisibility(
+                view_setup_hints=mdl.ViewSetupHints(
+                    spaces_visible=False,
+                    space_boundaries_visible=False,
+                    openings_visible=False,
+                ),
+                exceptions=mdl.ComponentVisibilityExceptions(
+                    component=[
+                        mdl.Component(ifc_guid="1m5wAJelDFdhn6qBdOGjos", originating_system="https://bimsync.com"),
+                        mdl.Component(ifc_guid="1bbI761TbBCOoIa5Kt6PXt", originating_system="https://bimsync.com"),
+                    ]
+                ),
+                default_visibility=True,
+            ),
+            coloring=mdl.ComponentColoring(),
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=23.112083480037754, y=-25.45574897560043, z=18.52519828443092),
+            camera_direction=mdl.Direction(x=-0.6289237666876837, y=0.5933487270610425, z=-0.5023864884632315),
+            camera_up_vector=mdl.Direction(x=-0.36542566067664123, y=0.3447553774917179, z=0.8646431727652648),
+            field_of_view=60,
+            aspect_ratio=1,
+        ),
+        lines=mdl.VisualizationInfoLines(),
+        clipping_planes=mdl.VisualizationInfoClippingPlanes(),
+        bitmaps=mdl.VisualizationInfoBitmaps(),
+        guid="20ad2ff7-ceac-4d4b-b288-ad92a0f65182",
+    )
+
+    viewpoint = viewpoints["Viewpoint_20ad2ff7-ceac-4d4b-b288-ad92a0f65182.bcfv"]
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_second_viewpoint(viewpoint, expected_selection, expected_exception, expected_coloring) -> None:
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            view_setup_hints=mdl.ViewSetupHints(
+                spaces_visible=False,
+                space_boundaries_visible=False,
+                openings_visible=False,
+            ),
+            selection=expected_selection,
+            visibility=mdl.ComponentVisibility(
+                exceptions=expected_exception,
+                default_visibility=False,
+            ),
+            coloring=expected_coloring,
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=-47.18794250488281, y=43.829200744628906, z=10.666350364685059),
+            camera_direction=mdl.Direction(x=0.6745243072509766, y=-0.6599355936050415, z=-0.33091068267822266),
+            camera_up_vector=mdl.Direction(x=0.2271970510482788, y=-0.24091780185699463, z=0.9435783624649048),
+            field_of_view=60,
+        ),
+        guid="21dd4807-e9af-439e-a980-04d913a6b1ce",
+    )
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_third_viewpoint(viewpoint, expected_selection, expected_exception, expected_coloring) -> None:
+    expected_vp = mdl.VisualizationInfo(
+        components=mdl.Components(
+            view_setup_hints=mdl.ViewSetupHints(
+                spaces_visible=False,
+                space_boundaries_visible=False,
+                openings_visible=True,
+            ),
+            selection=expected_selection,
+            visibility=mdl.ComponentVisibility(
+                exceptions=expected_exception,
+                default_visibility=True,
+            ),
+            coloring=expected_coloring,
+        ),
+        perspective_camera=mdl.PerspectiveCamera(
+            camera_view_point=mdl.Point(x=-48.974571228027344, y=-64.20051574707031, z=10.666350364685059),
+            camera_direction=mdl.Direction(x=0.7232745289802551, y=0.5967116951942444, z=-0.3475759029388428),
+            camera_up_vector=mdl.Direction(x=0.27662187814712524, y=0.21082592010498047, z=0.937567412853241),
+            field_of_view=60,
+        ),
+        guid="81daa431-bf01-4a49-80a2-1ab07c177717",
+    )
+    assert viewpoint.visualization_info == expected_vp
+    assert viewpoint.snapshot is not None
+
+
+def assert_files_present(saved_bcf_path):
+    expected_files = [
+        "bcf.version",
+        "project.bcfp",
+        "documents.xml",
+        "extensions.xml",
+        "documents/b1d1b7f0-60b9-457d-ad12-16e0fb997bc5",
+        "8ac9822a-761a-4deb-9f39-f61286acbf6a/markup.bcf",
+        "8ac9822a-761a-4deb-9f39-f61286acbf6a/Viewpoint_20ad2ff7-ceac-4d4b-b288-ad92a0f65182.bcfv",
+        "8ac9822a-761a-4deb-9f39-f61286acbf6a/Snapshot_20ad2ff7-ceac-4d4b-b288-ad92a0f65182.png",
+    ]
+
+    with zipfile.ZipFile(saved_bcf_path) as bcf_zip:
+        for file_path in expected_files:
+            assert zipfile.Path(bcf_zip, file_path).exists()
@@ -0,0 +1,36 @@
+import numpy as np
+import pytest
+
+from bcf.v3.bcfxml import BcfXml
+
+
+def test_create_clash_set_bcf() -> None:
+    bcfxml = BcfXml.create_new("Clash Test")
+    topic = bcfxml.add_topic("Test", "Test topic", "IfcClash")
+    topic.add_viewpoint_from_point_and_guids(
+        np.array([10, 10, 10]),
+        "firstId",
+        "secondId",
+    )
+    assert len(topic.viewpoints) == 1
+    guid, vi_handler = next((k, v) for k, v in topic.viewpoints.items())
+    v_info = vi_handler.visualization_info
+    assert f"{v_info.guid}.bcfv" == guid
+    components = v_info.components.selection.component
+    assert {c.ifc_guid for c in components} == {"firstId", "secondId"}
+    camera = v_info.perspective_camera
+    viewpoint = camera.camera_view_point
+    assert viewpoint.x == 15
+    assert viewpoint.y == 15
+    assert viewpoint.z == 15
+    # default direction is the unit vector of -1, -1, -1
+    direction = camera.camera_direction
+    assert direction.x == pytest.approx(-1 / 3**0.5)
+    assert direction.y == pytest.approx(-1 / 3**0.5)
+    assert direction.z == pytest.approx(-1 / 3**0.5)
+    # default
+    up_vector = camera.camera_up_vector
+    assert up_vector.x == pytest.approx(-1 / 6**0.5)
+    assert up_vector.y == pytest.approx(-1 / 6**0.5)
+    assert up_vector.z == pytest.approx(1 / 1.5**0.5)
+    assert camera.field_of_view == 60
@@ -47,7 +47,7 @@ PYNUMBER:=39
 endif
 ifeq ($(PYVERSION), py310)
 PYLIBDIR:=python3.10
-PYNUMBER:=31
+PYNUMBER:=310
 endif

 ifeq ($(PLATFORM), linux)
@@ -56,7 +56,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/linux-64/hpp
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.5/download/linux-64/eigenpy-2.6.5-py37h95e2c48_0.tar.bz2
 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/linux-64/boost-1.74.0-py37h0379df6_3.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/a2/73/07f507b539527579c026ed5f411c35e287685ce794c4dfb7edf6675cdc24/Shapely-1.8.4-cp37-cp37m-manylinux_2_12_x86_64.manylinux2010_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/1d/a4/931d0780f31f3ea8c4f9ef6464a2825137c5241e6707a5fb03bef760a7eb/shapely-2.0.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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 endif
 ifeq ($(PYVERSION), py39)
@@ -64,7 +64,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/linux-64/hpp
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.5/download/linux-64/eigenpy-2.6.5-py39h5aed9d1_0.tar.bz2
 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/linux-64/boost-1.74.0-py39h5472131_3.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/08/12/5af915b2bc0470f4a652ef9978557a0fa8b705b122ccaec6626029e1674c/Shapely-1.8.4-cp39-cp39-manylinux_2_12_x86_64.manylinux2010_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/2d/f2/8ec281d357e8bb7d08dc8d727f0e4c8ef3dae7d3fa75c69c8e452bb82d50/shapely-2.0.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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 endif
 ifeq ($(PYVERSION), py310)
@@ -72,7 +72,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.8.0/download/linux-64/hpp
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.11/download/linux-64/eigenpy-2.6.11-py310hf3e5c9c_0.tar.bz2
 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/linux-64/boost-1.74.0-py310h7c3ba0c_5.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/60/20/c6321e3da92a4ad9495727c9aa8c423e47295572ccd35ece82d1ac013e28/Shapely-1.8.4-cp310-cp310-manylinux_2_12_x86_64.manylinux2010_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/a8/a5/403728b5614b28083f6424dfdefec5fcf58068495fb03bb08532671c642f/shapely-2.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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 endif
 ASSIMP_URL:=https://anaconda.org/conda-forge/assimp/5.0.1/download/linux-64/assimp-5.0.1-hedfc422_6.tar.bz2
@@ -86,7 +86,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/osx-64/hpp-f
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.5/download/osx-64/eigenpy-2.6.5-py37h0695097_0.tar.bz2
 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/osx-64/boost-1.74.0-py37hd79e0ac_3.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/47/a9/7c644e71638bff2bbaa87f05ee62fdf6b4552a55e74bbf731d6210b6d436/Shapely-1.8.4-cp37-cp37m-macosx_10_9_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/e6/7d/4923f27c340339e1c896c77cafc8ed672c8d381a025bbab6c6ddcba27e8f/shapely-2.0.1-cp37-cp37m-macosx_10_9_x86_64.whl
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 endif
 ifeq ($(PYVERSION), py39)
@@ -94,7 +94,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/osx-64/hpp-f
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.5/download/osx-64/eigenpy-2.6.5-py39h5405915_0.tar.bz2
 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/osx-64/boost-1.74.0-py39ha641261_3.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/f5/f9/bf6cc34b02b3c7d3777c5e47fa57d2f69387613bbd8decdf3577a9d83a83/Shapely-1.8.4-cp39-cp39-macosx_10_9_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/36/a4/7e542a209f862f967d7cb8e939eff155f4294a27d17e16441fb8bdd51a2c/shapely-2.0.1-cp39-cp39-macosx_10_9_x86_64.whl
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 endif
 ifeq ($(PYVERSION), py310)
@@ -102,7 +102,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.8.0/download/osx-64/hpp-f
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.11/download/osx-64/eigenpy-2.6.11-py310hc03097c_0.tar.bz2
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-SHAPELY_URL:=https://files.pythonhosted.org/packages/f5/a8/02347c450b5507b9a7a2c15ad6a029613149468fc55ac2100ab215666159/Shapely-1.8.4-cp310-cp310-macosx_10_9_x86_64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/1f/2a/dc3353c2431cf53e8d04bb8fba27e584410ca3435c9c85f76d71bf0c0e80/shapely-2.0.1-cp310-cp310-macosx_10_9_x86_64.whl
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 endif
 ASSIMP_URL:=https://anaconda.org/conda-forge/assimp/5.0.1/download/osx-64/assimp-5.0.1-h1224e73_6.tar.bz2
@@ -117,7 +117,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/osx-64/hpp-f
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 BOOST_URL:=https://anaconda.org/conda-forge/boost/1.74.0/download/osx-64/boost-1.74.0-py37hd79e0ac_3.tar.bz2
 LXML_URL:=https://anaconda.org/conda-forge/lxml/4.9.1/download/osx-64/lxml-4.9.1-py37h994c40b_0.tar.bz2
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+SHAPELY_URL:=https://files.pythonhosted.org/packages/e6/7d/4923f27c340339e1c896c77cafc8ed672c8d381a025bbab6c6ddcba27e8f/shapely-2.0.1-cp37-cp37m-macosx_10_9_x86_64.whl
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 endif
 ifeq ($(PYVERSION), py39)
@@ -125,7 +125,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/osx-arm64/hp
 EIGENPY_URL:=https://anaconda.org/conda-forge/eigenpy/2.6.7/download/osx-arm64/eigenpy-2.6.7-py39ha69f3c1_0.tar.bz2
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+SHAPELY_URL:=https://files.pythonhosted.org/packages/ea/aa/45fbd031edf3149cb767d8b9f9db45d5faf0324d743c6b8fb0298cc022d0/shapely-2.0.1-cp39-cp39-macosx_11_0_arm64.whl
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@@ -133,7 +133,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.8.0/download/osx-arm64/hp
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+SHAPELY_URL:=https://files.pythonhosted.org/packages/e2/87/b8b8d8d57b429b01aa56b7d723075c09f33c988b8091bb6f790c83436909/shapely-2.0.1-cp37-cp37m-win_amd64.whl
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@@ -155,7 +155,7 @@ HPPFCL_URL:=https://anaconda.org/conda-forge/hpp-fcl/1.7.5/download/win-64/hpp-f
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+SHAPELY_URL:=https://files.pythonhosted.org/packages/a7/ae/eab645c4075093584b7a65ab71cb8ff4563a015bd935c9b55dba14b2c1eb/shapely-2.0.1-cp39-cp39-win_amd64.whl
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 LXML_URL:=https://files.pythonhosted.org/packages/f6/71/65c80a4caa1617a4c6e8fe1500cebb179db96232e2f623bfe6a1f4294e39/lxml-4.8.0-cp310-cp310-win_amd64.whl
-SHAPELY_URL:=https://files.pythonhosted.org/packages/24/b5/46d13799804b5fe9ede2eca8b19023410e29b78baca0bff727671a1df8c1/Shapely-1.8.4-cp310-cp310-win_amd64.whl
+SHAPELY_URL:=https://files.pythonhosted.org/packages/81/8a/7ac076a86b2632f1872284c5e60ed5f2fc26094875a85b35d9fa17b52504/shapely-2.0.1-cp310-cp310-win_amd64.whl
 PILLOW_URL:=https://files.pythonhosted.org/packages/02/55/67a3c17b9e7d972ed8c246f104da99ca4f3ea42fba566697e479011b84b6/Pillow-9.2.0-cp310-cp310-win_amd64.whl
 endif
 ASSIMP_URL:=https://anaconda.org/conda-forge/assimp/5.0.1/download/win-64/assimp-5.0.1-hc2aa0de_6.tar.bz2
@@ -171,6 +171,13 @@ OCTOMAP_URL:=https://anaconda.org/conda-forge/octomap/1.9.7/download/win-64/octo
 ZLIB_URL:=https://anaconda.org/conda-forge/zlib/1.2.11/download/win-64/zlib-1.2.11-h62dcd97_1010.tar.bz2
 endif

+.PHONY: bump
+bump:
+	cd . && $(SED) "s/$(OLD)/$(NEW)/" Makefile
+	cd ../ifcopenshell-python/ && $(SED) "s/$(OLD)/$(NEW)/" Makefile
+	cd ../ifcopenshell-python/docs/ifcconvert/ && $(SED) "s/$(OLD)/$(NEW)/" installation.rst
+	cd ../ifcopenshell-python/docs/ifcopenshell-python/ && $(SED) "s/$(OLD)/$(NEW)/" installation.rst
+
 .PHONY: dist
 dist:
 ifndef PLATFORM
@@ -182,7 +189,7 @@ endif
 	cp -r blenderbim/* dist/blenderbim/

 	# Provides IfcOpenShell Python functionality
-	cd dist/working && wget https://s3.amazonaws.com/ifcopenshell-builds/ifcopenshell-python-$(PYNUMBER)-v0.7.0-fa6bbf2-$(PLATFORM)64.zip
+	cd dist/working && wget https://s3.amazonaws.com/ifcopenshell-builds/ifcopenshell-python-$(PYNUMBER)-v0.7.0-476ab50-$(PLATFORM)64.zip
 	cd dist/working && unzip ifcopenshell-python*
 	cp -r dist/working/ifcopenshell dist/blenderbim/libs/site/packages/

@@ -200,6 +207,7 @@ endif
 	cp -r dist/working/IfcOpenShell-0.7.0/src/ifcopenshell-python/ifcopenshell/api/* dist/blenderbim/libs/site/packages/ifcopenshell/api/
 	cp dist/working/IfcOpenShell-0.7.0/src/ifcopenshell-python/ifcopenshell/entity_instance.py dist/blenderbim/libs/site/packages/ifcopenshell/
 	cp dist/working/IfcOpenShell-0.7.0/src/ifcopenshell-python/ifcopenshell/file.py dist/blenderbim/libs/site/packages/ifcopenshell/
+	cp dist/working/IfcOpenShell-0.7.0/src/ifcopenshell-python/ifcopenshell/validate.py dist/blenderbim/libs/site/packages/ifcopenshell/
 	# Provides bcf functionality
 	cp -r dist/working/IfcOpenShell-0.7.0/src/bcf/src/bcf dist/blenderbim/libs/site/packages/
 	# Provides IFCClash functionality
@@ -229,6 +237,7 @@ endif
 	rm -rf dist/working

 	# Provides Mustache templating in construction documentation
+	# TODO: remove this dependency, it seems overkill and we seem to get by with str replaces
 	mkdir dist/working
 	cd dist/working && wget https://files.pythonhosted.org/packages/3f/e7/8750ba6c6101d6aa5ceeb20c013adf2c6f3554a12c71d75654b468404bfa/pystache-0.6.0.tar.gz
 	cd dist/working && tar -xzvf pystache*
@@ -270,6 +279,13 @@ endif
 	cp -r dist/working/decorator-5.0.9/src/decorator.py dist/blenderbim/libs/site/packages/
 	rm -rf dist/working

+	# Provides audio playback for costing
+	mkdir -p dist/working
+	git clone https://github.com/Andrej730/aud.git --branch master-reduced-size --depth 1 dist/working/aud
+	cd dist/working/aud && git checkout 529af208fbcb707c387bfb681d2605c0b6112de7
+	cp -r dist/working/aud/aud dist/blenderbim/libs/site/packages/
+	rm -rf dist/working
+
 	# Provides jsgantt-improved supports for web-based construction sequencing gantt charts
 	mkdir dist/working
 	cd dist/working && wget https://raw.githubusercontent.com/jsGanttImproved/jsgantt-improved/master/dist/jsgantt.js
@@ -312,6 +328,13 @@ endif
 	cp -r dist/working/xmlschema-2.0.2/xmlschema dist/blenderbim/libs/site/packages/
 	rm -rf dist/working

+	# Required by bcf
+	mkdir dist/working
+	cd dist/working && wget https://files.pythonhosted.org/packages/ad/c7/17c9d16320d8e2cfdb27d2fd298b5e8f7a3f211025b0c1bc7a39a85bd690/xsdata-22.11.tar.gz
+	cd dist/working && tar -xzvf xsdata*
+	cp -r dist/working/xsdata-22.11/xsdata dist/blenderbim/libs/site/packages/
+	rm -rf dist/working
+
 	# Required by bcf
 	mkdir dist/working
 	cd dist/working && wget https://files.pythonhosted.org/packages/11/bc/5afb61dd5d863e5cf77cd952445c50c17e65953405986f19e97e4389692a/elementpath-3.0.2.tar.gz
@@ -346,10 +369,10 @@ endif
 	cd dist/working && cp *.whl shapely.zip && unzip shapely.zip
 	cp -r dist/working/shapely dist/blenderbim/libs/site/packages/
 ifeq ($(PLATFORM), win)
-	cp -r dist/working/Shapely.libs dist/blenderbim/libs/site/packages/
+	cp -r dist/working/shapely.libs dist/blenderbim/libs/site/packages/
 endif
 ifeq ($(PLATFORM), linux)
-	cp -r dist/working/Shapely.libs dist/blenderbim/libs/site/packages/
+	cp -r dist/working/shapely.libs dist/blenderbim/libs/site/packages/
 endif
 	rm -rf dist/working

@@ -371,11 +394,13 @@ endif
 	cp -r dist/working/tqdm-4.50.0/tqdm dist/blenderbim/libs/site/packages/
 	rm -rf dist/working

-	# Required by IFCCityJSON
 	mkdir dist/working
 	cd dist/working && $(PYTHON) -m venv env
 	cd dist/working && mkdir site-packages
+	# Required by IFCCityJSON
 	cd dist/working && . env/bin/activate && pip install cjio --target=./site-packages
+	# Provides express rule validation for ifcopenshell.validate
+	cd dist/working && . env/bin/activate && pip install pytest --target=./site-packages
 	cd dist/working/site-packages/ && rm -r *dist-info*
 	cp -r dist/working/site-packages/* dist/blenderbim/libs/site/packages/
 	rm -rf dist/working
@@ -521,6 +546,7 @@ endif
 	rm -rf dist/working

 	# Required by IFCCOBie for XLSX support
+	# TODO: see if we can replace this with openpyxl which does both read/write
 	mkdir dist/working
 	cd dist/working && wget https://files.pythonhosted.org/packages/0c/bc/82d6783f83f65f56d8b77d052773c4a2f952fa86385f0cd54e1e006658d7/XlsxWriter-1.2.9.tar.gz
 	cd dist/working && tar -xzvf XlsxWriter*
@@ -624,6 +650,13 @@ endif
 	cd dist/working/ && cp -r pkg_resources ../blenderbim/libs/site/packages/
 	rm -rf dist/working

+	# Required for hipped roof generation
+	mkdir dist/working
+	cd dist/working && wget https://github.com/prochitecture/bpypolyskel/archive/refs/heads/master.zip
+	cd dist/working && unzip master.zip
+	cp -r dist/working/bpypolyskel-master/bpypolyskel dist/blenderbim/libs/site/packages/
+	rm -rf dist/working
+
 	cd dist/blenderbim && $(SED) "s/999999/$(VERSION)/" __init__.py
 	cd dist && zip -r blenderbim-$(VERSION)-$(PYVERSION)-$(PLATFORM).zip ./*
 	rm -rf dist/blenderbim
@@ -91,10 +91,12 @@ classes = [
    operator.RemoveIfcFile,
    operator.SelectDataDir,
    operator.SelectIfcFile,
+    operator.ReloadSelectedIfcFile,
    operator.SelectSchemaDir,
    operator.SelectURIAttribute,
    operator.EditBlenderCollection,
    operator.BIM_OT_open_webbrowser,
+    operator.BIM_OT_show_description,
    prop.StrProperty,
    operator.BIM_OT_enum_property_search,  # /!\ Register AFTER prop.StrProperty
    prop.ObjProperty,
@@ -115,6 +117,7 @@ classes = [
    ui.BIM_PT_project_info,
    ui.BIM_PT_project_setup,
    ui.BIM_PT_collaboration,
+    ui.BIM_PT_selection,
    ui.BIM_PT_geometry,
    ui.BIM_PT_services,
    ui.BIM_PT_structural,
@@ -159,6 +162,8 @@ def register():
    bpy.types.Camera.BIMMeshProperties = bpy.props.PointerProperty(type=prop.BIMMeshProperties)
    bpy.types.PointLight.BIMMeshProperties = bpy.props.PointerProperty(type=prop.BIMMeshProperties)
    bpy.types.SCENE_PT_unit.append(ui.ifc_units)
+    if hasattr(bpy.types, "UI_MT_button_context_menu"):
+        bpy.types.UI_MT_button_context_menu.append(ui.draw_custom_context_menu)

    for mod in modules.values():
        mod.register()
@@ -179,6 +184,8 @@ def unregister():
    del bpy.types.Camera.BIMMeshProperties
    del bpy.types.PointLight.BIMMeshProperties
    bpy.types.SCENE_PT_unit.remove(ui.ifc_units)
+    if hasattr(bpy.types, "UI_MT_button_context_menu"):
+        bpy.types.UI_MT_button_context_menu.remove(ui.draw_custom_context_menu)

    for mod in reversed(list(modules.values())):
        mod.unregister()
@@ -1,13 +1,13 @@
 ISO-10303-21;
 HEADER;
 FILE_DESCRIPTION(('ViewDefinition[DesignTransferView]'),'2;1');
-FILE_NAME('/dev/null','2022-10-14T18:00:26+11:00',(),(),'IfcOpenShell v0.7.0-dc67287d','IfcOpenShell v0.7.0-dc67287d','Nobody');
+FILE_NAME('/dev/null','2023-02-04T13:08:05+11:00',(),(),'IfcOpenShell v0.7.0-07ee62eb9','IfcOpenShell v0.7.0-07ee62eb9','Nobody');
 FILE_SCHEMA(('IFC4'));
 ENDSEC;
 DATA;
-#1=IFCPROJECT('0yOx2IKFL4HAbf$IjzE0Kp',$,'BlenderBIM Demo',$,$,$,$,(#12,#16),#7);
-#2=IFCPROJECTLIBRARY('2jUXWJsnH2pxWl9Bl3Ljhd',$,'BlenderBIM Demo Library',$,$,$,$,$,$);
-#3=IFCRELDECLARES('0Rn4fWoen7xB9hskGGEfEy',$,$,$,#1,(#2));
+#1=IFCPROJECT('3ubSuEuavEPfXTf4v0gmbA',$,'BlenderBIM Demo',$,$,$,$,(#12,#16),#7);
+#2=IFCPROJECTLIBRARY('1Qq43hq0v3B9Ko7EGW0hJ5',$,'BlenderBIM Demo Library',$,$,$,$,$,$);
+#3=IFCRELDECLARES('0hU2lTJfX70AKkhyURrbam',$,$,$,#1,(#2));
 #4=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
 #5=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
 #6=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);
@@ -17,89 +17,89 @@ DATA;
 #10=IFCDIRECTION((1.,0.,0.));
 #11=IFCAXIS2PLACEMENT3D(#8,#9,#10);
 #12=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#11,$);
-#13=IFCCARTESIANPOINT((0.,0.,0.));
-#14=IFCDIRECTION((1.,0.,0.));
+#13=IFCCARTESIANPOINT((0.,0.));
+#14=IFCDIRECTION((1.,0.));
 #15=IFCAXIS2PLACEMENT2D(#13,#14);
 #16=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Plan',2,1.E-05,#15,$);
 #17=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#12,$,.MODEL_VIEW.,$);
-#18=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Annotation','Plan',*,*,*,*,#16,$,.PLAN_VIEW.,$);
+#18=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Plan',*,*,*,*,#16,$,.PLAN_VIEW.,$);
 #19=IFCMATERIAL('Unknown',$,$);
-#20=IFCWALLTYPE('0D2QFqmA18fvA6TUteIRXc',$,'WAL50',$,$,$,$,$,$,.NOTDEFINED.);
+#20=IFCWALLTYPE('3yGmcLQT96CPWJXcV3vNPJ',$,'WAL50',$,$,$,$,$,$,.NOTDEFINED.);
 #21=IFCMATERIALLAYERSET((#23),$,$);
-#22=IFCRELASSOCIATESMATERIAL('0WbN7alqv8ix3w4MOdyl8F',$,$,$,(#20),#21);
+#22=IFCRELASSOCIATESMATERIAL('0JMzROKjj7i8EKtMLZ2nXy',$,$,$,(#20),#21);
 #23=IFCMATERIALLAYER(#19,0.05,$,$,$,$,$);
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-#25=IFCWALLTYPE('0qRxb2OqjDEfFI9i7b6qAw',$,'WAL100',$,$,$,$,$,$,.NOTDEFINED.);
+#24=IFCRELDECLARES('1TTgyh7ynBQ8XpgpGSU6ao',$,$,$,#2,(#41,#76,#47,#58,#91,#25,#159,#225,#71,#29,#62,#95,#20,#53,#86,#33,#66,#81,#37));
+#25=IFCWALLTYPE('20jY5HfLH4LBwMrDEoTdML',$,'WAL100',$,$,$,$,$,$,.NOTDEFINED.);
 #26=IFCMATERIALLAYERSET((#28),$,$);
-#27=IFCRELASSOCIATESMATERIAL('3BDm6HH553QhwCW7FPmjrR',$,$,$,(#25),#26);
+#27=IFCRELASSOCIATESMATERIAL('2sICOUhur5WgrNUOi1pvhV',$,$,$,(#25),#26);
 #28=IFCMATERIALLAYER(#19,0.1,$,$,$,$,$);
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+#29=IFCWALLTYPE('0xhGqQenH5Ov9L_CiLywqN',$,'WAL200',$,$,$,$,$,$,.NOTDEFINED.);
 #30=IFCMATERIALLAYERSET((#32),$,$);
-#31=IFCRELASSOCIATESMATERIAL('1$36L06DrDYx1sZ9tBQ_WE',$,$,$,(#29),#30);
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 #34=IFCMATERIALLAYERSET((#36),$,$);
-#35=IFCRELASSOCIATESMATERIAL('1WSONmheTD9xhiluqtfktr',$,$,$,(#33),#34);
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 #36=IFCMATERIALLAYER(#19,0.3,$,$,$,$,$);
-#37=IFCCOVERINGTYPE('1pAuiYopL5hxCATiIPV8QG',$,'COV10',$,$,$,$,$,$,.NOTDEFINED.);
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 #38=IFCMATERIALLAYERSET((#40),$,$);
-#39=IFCRELASSOCIATESMATERIAL('0ysRf97LT8fw28mDwt2vop',$,$,$,(#37),#38);
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 #40=IFCMATERIALLAYER(#19,0.01,$,$,$,$,$);
-#41=IFCCOVERINGTYPE('00LbT8PQf3XwImYkj_i_$4',$,'COV20',$,$,(#45),$,$,$,.NOTDEFINED.);
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 #42=IFCMATERIALLAYERSET((#44),$,$);
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+#45=IFCPROPERTYSET('0fSGHPSBH9U8H_ph5xpH65',$,'EPset_Parametric',$,(#46));
 #46=IFCPROPERTYSINGLEVALUE('LayerSetDirection',$,IFCLABEL('AXIS2'),$);
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 #48=IFCMATERIALLAYERSET((#50),$,$);
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 #50=IFCMATERIALLAYER(#19,0.03,$,$,$,$,$);
-#51=IFCPROPERTYSET('2M2_M1eSXFYR8vFE96Ecy1',$,'EPset_Parametric',$,(#52));
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 #54=IFCMATERIALLAYERSET((#56),$,$);
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 #59=IFCMATERIALPROFILESET($,$,(#61),$);
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+#80=IFCRECTANGLEHOLLOWPROFILEDEF(.AREA.,'150x75x2.0 RHS',$,0.075,0.15,0.002,0.005,0.005);
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 #85=IFCISHAPEPROFILEDEF(.AREA.,'DEMO-I',$,0.1,0.2,0.005,0.01,0.005,$,$);
-#86=IFCBEAMTYPE('1xjrF860f2H9zb04Ui98Rt',$,'B1',$,$,$,$,$,$,.NOTDEFINED.);
+#86=IFCBEAMTYPE('06Td_2IhD5OgyKW34Ikv$Z',$,'B1',$,$,$,$,$,$,.NOTDEFINED.);
 #87=IFCMATERIALPROFILESET($,$,(#89),$);
-#88=IFCRELASSOCIATESMATERIAL('03i9c81690fx2ZTBBXcqkL',$,$,$,(#86),#87);
+#88=IFCRELASSOCIATESMATERIAL('2cT5kDtU11jv2sFtIKVfJa',$,$,$,(#86),#87);
 #89=IFCMATERIALPROFILE($,$,#19,#85,$,$);
 #90=IFCCSHAPEPROFILEDEF(.AREA.,'DEMO-C',$,0.2,0.1,0.0015,0.03,0.005);
-#91=IFCBEAMTYPE('3mAc_7AGP06w4CzYOlYVL2',$,'B2',$,$,$,$,$,$,.NOTDEFINED.);
+#91=IFCBEAMTYPE('1JyktsoBP8DgMbJiECPZ6d',$,'B2',$,$,$,$,$,$,.NOTDEFINED.);
 #92=IFCMATERIALPROFILESET($,$,(#94),$);
-#93=IFCRELASSOCIATESMATERIAL('2xvXgaSvL7KPR25fXz0fSE',$,$,$,(#91),#92);
+#93=IFCRELASSOCIATESMATERIAL('2$_YKuP914sBZmflM_8l1s',$,$,$,(#91),#92);
 #94=IFCMATERIALPROFILE($,$,#19,#90,$,$);
-#95=IFCWINDOWTYPE('1kxjrhA4P2dwwueZ0_nSuu',$,'WT01',$,$,$,(#136,#158),$,$,.NOTDEFINED.,.NOTDEFINED.,$,$);
+#95=IFCWINDOWTYPE('0g10V5zVP8c96j3mPV0Xvn',$,'WT01',$,$,$,(#136,#158),$,$,.NOTDEFINED.,.NOTDEFINED.,$,$);
 #96=IFCINDEXEDPOLYGONALFACE((13,17,18,14));
 #97=IFCINDEXEDPOLYGONALFACE((5,6,3,4));
 #98=IFCINDEXEDPOLYGONALFACE((7,8,2,1));
@@ -157,13 +157,13 @@ DATA;
 #150=IFCINDEXEDPOLYCURVE(#137,(IFCLINEINDEX((5,11))),$);
 #151=IFCINDEXEDPOLYCURVE(#137,(IFCLINEINDEX((6,12))),$);
 #152=IFCGEOMETRICCURVESET((#138,#139,#140,#141,#142,#143,#144,#145,#146,#147,#148,#149,#150,#151));
-#153=IFCSHAPEREPRESENTATION(#18,'Annotation','Annotation2D',(#152));
+#153=IFCSHAPEREPRESENTATION(#18,'Body','Annotation2D',(#152));
 #154=IFCCARTESIANPOINT((0.,0.,0.));
 #155=IFCDIRECTION((1.,0.,0.));
 #156=IFCDIRECTION((0.,0.,1.));
 #157=IFCAXIS2PLACEMENT3D(#154,#156,#155);
 #158=IFCREPRESENTATIONMAP(#157,#153);
-#159=IFCDOORTYPE('0s370BWH51r8Xg03pJ5OBE',$,'DT01',$,$,$,(#204,#224),$,$,.NOTDEFINED.,.NOTDEFINED.,$,$);
+#159=IFCDOORTYPE('0nu4v3oPPFmQIz2RA1Vp_t',$,'DT01',$,$,$,(#204,#224),$,$,.NOTDEFINED.,.NOTDEFINED.,$,$);
 #160=IFCINDEXEDPOLYGONALFACE((17,16,15,14));
 #161=IFCINDEXEDPOLYGONALFACE((2,3,29,28));
 #162=IFCINDEXEDPOLYGONALFACE((27,28,29,30,32,31));
@@ -223,13 +223,13 @@ DATA;
 #216=IFCINDEXEDPOLYCURVE(#205,(IFCLINEINDEX((11,15))),$);
 #217=IFCINDEXEDPOLYCURVE(#205,(IFCLINEINDEX((17,18)),IFCLINEINDEX((18,19)),IFCLINEINDEX((19,20)),IFCLINEINDEX((20,21)),IFCLINEINDEX((21,22)),IFCLINEINDEX((22,23)),IFCLINEINDEX((23,24)),IFCLINEINDEX((24,25)),IFCLINEINDEX((25,26)),IFCLINEINDEX((26,27)),IFCLINEINDEX((27,28)),IFCLINEINDEX((28,29))),$);
 #218=IFCGEOMETRICCURVESET((#206,#207,#208,#209,#210,#211,#212,#213,#214,#215,#216,#217));
-#219=IFCSHAPEREPRESENTATION(#18,'Annotation','Annotation2D',(#218));
+#219=IFCSHAPEREPRESENTATION(#18,'Body','Annotation2D',(#218));
 #220=IFCCARTESIANPOINT((0.,0.,0.));
 #221=IFCDIRECTION((1.,0.,0.));
 #222=IFCDIRECTION((0.,0.,1.));
 #223=IFCAXIS2PLACEMENT3D(#220,#222,#221);
 #224=IFCREPRESENTATIONMAP(#223,#219);
-#225=IFCFURNITURETYPE('227RrM$yD30RGzlTgbBH3c',$,'BUN01',$,$,$,(#946,#988),$,$,.NOTDEFINED.,.NOTDEFINED.);
+#225=IFCFURNITURETYPE('2YuVxsKJL9URJtwIhHY2GN',$,'BUN01',$,$,$,(#946,#988),$,$,.NOTDEFINED.,.NOTDEFINED.);
 #226=IFCINDEXEDPOLYGONALFACE((187,278,44));
 #227=IFCINDEXEDPOLYGONALFACE((21,52,60));
 #228=IFCINDEXEDPOLYGONALFACE((91,100,31));
@@ -987,7 +987,7 @@ DATA;
 #980=IFCINDEXEDPOLYCURVE(#947,(IFCLINEINDEX((60,61)),IFCLINEINDEX((61,62)),IFCLINEINDEX((62,63))),$);
 #981=IFCINDEXEDPOLYCURVE(#947,(IFCLINEINDEX((64,31))),$);
 #982=IFCGEOMETRICCURVESET((#948,#949,#950,#951,#952,#953,#954,#955,#956,#957,#958,#959,#960,#961,#962,#963,#964,#965,#966,#967,#968,#969,#970,#971,#972,#973,#974,#975,#976,#977,#978,#979,#980,#981));
-#983=IFCSHAPEREPRESENTATION(#18,'Annotation','Annotation2D',(#982));
+#983=IFCSHAPEREPRESENTATION(#18,'Body','Annotation2D',(#982));
 #984=IFCCARTESIANPOINT((0.,0.,0.));
 #985=IFCDIRECTION((1.,0.,0.));
 #986=IFCDIRECTION((0.,0.,1.));
@@ -1,13 +0,0 @@
-ISO-10303-21;
-HEADER;
-FILE_DESCRIPTION((),'2;1');
-FILE_NAME('EPset_Annotation.ifc','2020-01-01T00:00:00',(),(),'EPset_Annotation','EPset_Annotation',$);
-FILE_SCHEMA(('IFC4'));
-ENDSEC;
-DATA;
-#1=IFCPROPERTYSETTEMPLATE('3VuPUwdCD2Qx3XDDRs0R1N',$,'EPset_Annotation','',.PSET_OCCURRENCEDRIVEN.,'IfcAnnotation',(#2,#3));
-#2=IFCSIMPLEPROPERTYTEMPLATE('2P7JN79n96Q9pElZ83LKe4',$,'ZIndex','',.P_SINGLEVALUE.,'IfcInteger',$,$,$,$,$,.READWRITE.);
-#3=IFCSIMPLEPROPERTYTEMPLATE('1Wpx_r2xj1_9w5JpI0QRJy',$,'Symbol','',.P_ENUMERATEDVALUE.,'IfcLabel',$,#4,$,$,$,.READWRITE.);
-#4=IFCPROPERTYENUMERATION('Symbol',(IFCLABEL('rectangle-tag'), IFCLABEL('door-tag')),$);
-ENDSEC;
-END-ISO-10303-21;
@@ -0,0 +1,16 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION((),'2;1');
+FILE_NAME('EPset_Annotation.ifc','2020-01-01T00:00:00',(),(),'EPset_Annotation','EPset_Annotation',$);
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCPROPERTYSETTEMPLATE('3VuPUwdCD2Qx3XDDRs0R1N',$,'EPset_Annotation','',.PSET_OCCURRENCEDRIVEN.,'IfcAnnotation',(#2,#3,#4));
+#2=IFCSIMPLEPROPERTYTEMPLATE('2P7JN79n96Q9pElZ83LKe4',$,'ZIndex','',.P_SINGLEVALUE.,'IfcInteger',$,$,$,$,$,.READWRITE.);
+#3=IFCSIMPLEPROPERTYTEMPLATE('1Wpx_r2xj1_9w5JpI0QRJy',$,'Symbol','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
+#4=IFCSIMPLEPROPERTYTEMPLATE('3q0oxMUKP47vZ4jnyG$dDb',$,'Classes','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
+#5=IFCPROPERTYSETTEMPLATE('0iKwujnQL9IevVQato8f7Z',$,'BBIM_Batting','',.PSET_OCCURRENCEDRIVEN.,'IfcAnnotation',(#6,#7));
+#6=IFCSIMPLEPROPERTYTEMPLATE('0t2LEesGT1QRQtrIZUAR8L',$,'Thickness','Batting thickness',.P_SINGLEVALUE.,'IfcPositiveLengthMeasure',$,$,$,$,$,.READWRITE.);
+#7=IFCSIMPLEPROPERTYTEMPLATE('082PndS6v2kBOiJoSboMnh',$,'Reverse pattern direction','Reverse batting pattern (swap starting and ending points)',.P_SINGLEVALUE.,'IfcBoolean',$,$,$,$,$,.READWRITE.);
+ENDSEC;
+END-ISO-10303-21;
@@ -19,11 +19,12 @@
 */

 * { stroke-linecap: round; stroke-linejoin: round; }
-text { fill: black; stroke: none; }
+text { /* 2.5mm */ fill: black; stroke: none; font-family: 'OpenGost Type B TT', 'DejaVu Sans Condensed', 'Liberation Sans', 'Arial Narrow', 'Arial'; font-size: 4.13px; }
 .cut { fill: black; stroke: black; stroke-linecap: 'round'; stroke-width: 0.35; fill-rule: evenodd; }
 .projection { fill: white; stroke: black; stroke-linecap: 'round'; stroke-width: 0.25; }
 .annotation { fill: none; stroke: black; stroke-linecap: 'round'; stroke-width: 0.25; }
 .IfcAnnotation { fill: none; stroke: black; stroke-linecap: 'round'; stroke-width: 0.25; }
+.IfcGeographicElement { fill: none; stroke: black; stroke-linecap: 'round'; stroke-width: 1; }
 .PredefinedType-LINEWORK { stroke: black; stroke-width: 0.25; }
 .PredefinedType-BACKGROUND { stroke: black; stroke-width: 0.18; }
 .PredefinedType-GRID { marker-start: url(#grid-marker); marker-end: url(#grid-marker); }
@@ -37,13 +38,18 @@ text { fill: black; stroke: none; }
 .PredefinedType-HIDDENLINE { stroke-dasharray: 3, 2; }
 .PredefinedType-STAIRARROW { marker-start: url(#stair-marker-start); marker-end: url(#stair-marker-end); }
 .PredefinedType-BOUNDARY { fill: none; stroke: red; stroke-width: 1; stroke-dasharray: 12, 4, 3, 4, 3, 4; }
-.PredefinedType-BATTING { marker-start: url(#batting); stroke: none; }
 .PredefinedType-SEALANT { fill: url(#crosshatch1); stroke-width: 0.25; }
-.PredefinedType-FILLAREA { fill: white; stroke: none; }
+.PredefinedType-FILLAREA { fill: white; stroke: black; }
 .PredefinedType-BREAKLINE { fill: none; stroke: black; stroke-width: 0.25; marker-mid: url(#breakline-marker); }
 .PredefinedType-TEXT { fill: black; stroke: none; }
 path.PredefinedType-TEXTLEADER { marker-end: url(#leader-marker); }
 text.PredefinedType-TEXTLEADER { fill: black; stroke: none; }
+text.title { /* 7mm */ font-size: 11.55px; }
+text.header { /* 5mm */ font-size: 8.25px; }
+text.large { /* 3.5mm */ font-size: 5.78px; }
+text.regular { /* 2.5mm */ font-size: 4.13px; }
+text.small { /* 1.8mm */ font-size: 2.97px; }
+text.GRID { /* 5mm */ font-size: 8.25px; }
 .material-blank { fill: white; }
 .material-diagonal1 { fill: url(#diagonal1); }
 .material-diagonal2 { fill: url(#diagonal2); }
@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <svg baseProfile="full" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:xlink="http://www.w3.org/1999/xlink">
-    <marker id="batting" markerHeight="10" markerWidth="4" orient="auto" refX="0" refY="5" markerUnits="userSpaceOnUse">
        <!-- Tip: https://svg-path-visualizer.netlify.app/ -->
-        <path style="fill: none; stroke:black; stroke-width:0.18" d="M 0 2 A 2 2 0 0 1 4 2 L 2 8 M 0 2 L 2 8 A 2 2 0 0 0 4 10 M 2 8 A 2 2 0 0 1 0 10" />
-    </marker>
+        <!-- Tip: https://www.svgviewer.dev/ -->
    <marker id="eng-dimension-marker-start" markerHeight="14" markerWidth="11" orient="auto" refX="1" refY="7">
        <g>
            <path d="M 11 3.5 L 11 10.5 L 1 7" class="annotation" style="fill:black;" />
@@ -26,8 +26,7 @@ from blenderbim.bim.module.drawing.prop import RasterStyleProperty
 from bpy.app.handlers import persistent
 from blenderbim.bim.ifc import IfcStore
 from blenderbim.bim.module.owner.prop import get_user_person, get_user_organisation
-from ifcopenshell.api.material.data import Data as MaterialData
-from ifcopenshell.api.type.data import Data as TypeData
+from blenderbim.bim.module.model.data import AuthoringData


 global_subscription_owner = object()
@@ -66,7 +65,6 @@ def name_callback(obj, data):
    if isinstance(obj, bpy.types.Material):
        if obj.BIMObjectProperties.ifc_definition_id:
            IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id).Name = obj.name
-            MaterialData.load_materials()
        if obj.BIMMaterialProperties.ifc_style_id:
            IfcStore.get_file().by_id(obj.BIMMaterialProperties.ifc_style_id).Name = obj.name
        refresh_ui_data()
@@ -90,8 +88,6 @@ def name_callback(obj, data):
                break
        if grid_collection:
            grid_collection.name = obj.name
-    if element.is_a("IfcTypeProduct"):
-        TypeData.purge()
    element.Name = "/".join(obj.name.split("/")[1:])
    refresh_ui_data()

@@ -301,3 +297,4 @@ def setDefaultProperties(scene):
        drawing_style.name = "Blender Default"
        drawing_style.render_type = "DEFAULT"
        bpy.ops.bim.save_drawing_style(index="2")
+        AuthoringData.type_thumbnails = {}
@@ -23,11 +23,12 @@ import math
 import zipfile
 import ifcopenshell
 import ifcopenshell.util.attribute
-from blenderbim.bim.prop import get_ifc_entity_doc_url
+import ifcopenshell.util.element
+from ifcopenshell.util.doc import get_attribute_doc, get_predefined_type_doc, get_property_doc
 from mathutils import geometry
 from mathutils import Vector
-from blenderbim.bim.ifc import IfcStore
 import blenderbim.tool as tool
+from blenderbim.bim.ifc import IfcStore


 def draw_attributes(props, layout, copy_operator=None):
@@ -43,16 +44,25 @@ def draw_attribute(attribute, layout, copy_operator=None):
        return
    if value_name == "enum_value":
        prop_with_search(layout, attribute, "enum_value", text=attribute.name)
+    elif attribute.name in ["ScheduleDuration", "ActualDuration", "FreeFloat", "TotalFloat"]:
+        propis = bpy.context.scene.BIMWorkScheduleProperties
+        for item in propis.durations_attributes:
+            if item.name == attribute.name:
+                duration_props = item
+                layout.label(text=attribute.name)
+                layout.prop(duration_props, "years", text="Y")
+                layout.prop(duration_props, "months", text="M")
+                layout.prop(duration_props, "days", text="D")
+                layout.prop(duration_props, "hours", text="H")
+                layout.prop(duration_props, "minutes", text="Min")
+                layout.prop(duration_props, "seconds", text="S")
+                break
    else:
        layout.prop(
            attribute,
            value_name,
            text=attribute.name,
        )
-    if "ScheduleDuration" in attribute.name:
-        layout.prop(bpy.context.scene.BIMDuration, "duration_days", text="D")
-        layout.prop(bpy.context.scene.BIMDuration, "duration_hours", text="H")
-        layout.prop(bpy.context.scene.BIMDuration, "duration_minutes", text="M")

    if attribute.is_optional:
        layout.prop(attribute, "is_null", icon="RADIOBUT_OFF" if attribute.is_null else "RADIOBUT_ON", text="")
@@ -85,6 +95,7 @@ def import_attribute(attribute, props, data, callback=None):
    new.is_null = data[attribute.name()] is None
    new.is_optional = attribute.optional()
    new.data_type = data_type if isinstance(data_type, str) else ""
+    new.ifc_class = data["type"]
    is_handled_by_callback = callback(attribute.name(), new, data) if callback else None

    if is_handled_by_callback:
@@ -92,19 +103,66 @@ def import_attribute(attribute, props, data, callback=None):
    elif is_handled_by_callback is False:
        props.remove(len(props) - 1)
    elif data_type == "string":
-        new.string_value = "" if new.is_null else data[attribute.name()]
+        new.string_value = "" if new.is_null else str(data[attribute.name()])
        if attribute.type_of_attribute().declared_type().name() == "IfcURIReference":
            new.is_uri = True
    elif data_type == "boolean":
-        new.bool_value = False if new.is_null else data[attribute.name()]
+        new.bool_value = False if new.is_null else bool(data[attribute.name()])
    elif data_type == "integer":
-        new.int_value = 0 if new.is_null else data[attribute.name()]
+        new.int_value = 0 if new.is_null else int(data[attribute.name()])
    elif data_type == "float":
-        new.float_value = 0.0 if new.is_null else data[attribute.name()]
+        new.float_value = 0.0 if new.is_null else float(data[attribute.name()])
    elif data_type == "enum":
-        new.enum_items = json.dumps(ifcopenshell.util.attribute.get_enum_items(attribute))
-        if data[attribute.name()]:
-            new.enum_value = data[attribute.name()]
+        enum_items = ifcopenshell.util.attribute.get_enum_items(attribute)
+        new.enum_items = json.dumps(enum_items)
+        add_attribute_enum_items_descriptions(new, enum_items)
+        if data[new.name]:
+            new.enum_value = data[new.name]
+    add_attribute_description(new, data)
+    add_attribute_min_max(new)
+
+
+ATTRIBUTE_MIN_MAX_CONSTRAINTS = {"IfcMaterialLayer": {"Priority": {"value_min": 0, "value_max": 100}}}
+
+
+def add_attribute_min_max(attribute_blender):
+    if attribute_blender.ifc_class in ATTRIBUTE_MIN_MAX_CONSTRAINTS:
+        constraints = ATTRIBUTE_MIN_MAX_CONSTRAINTS[attribute_blender.ifc_class].get(attribute_blender.name, {})
+        for constraint, value in constraints.items():
+            setattr(attribute_blender, constraint, value)
+            setattr(attribute_blender, constraint + "_constraint", True)
+
+
+def add_attribute_enum_items_descriptions(attribute_blender, enum_items):
+    attribute_blender.enum_descriptions.clear()
+    if isinstance(enum_items, dict):
+        enum_items = enum_items.keys()
+    version = tool.Ifc.get_schema()
+    for enum_item in enum_items:
+        new_enum_description = attribute_blender.enum_descriptions.add()
+        try:
+            description = get_predefined_type_doc(version, attribute_blender.ifc_class, enum_item) or ""
+        except KeyError:  # TODO this only supports predefined type enums. Add support for other types of enums ?
+            description = ""
+        new_enum_description.name = description
+
+
+def add_attribute_description(attribute_blender, attribute_ifc=None):
+    if not attribute_blender.name:
+        return
+    version = tool.Ifc.get_schema()
+    description = ""
+    try:
+        description = get_attribute_doc(version, attribute_blender.ifc_class, attribute_blender.name)
+    except RuntimeError:  # It's not an Entity Attribute. Let's try a Property Set attribute.
+        doc = get_property_doc(version, attribute_blender.ifc_class, attribute_blender.name)
+        if doc:
+            description = doc.get("description", "")
+        else:  # It's a custom property set. Check if this attribute has a description
+            if attribute_ifc is not None:
+                description = getattr(attribute_ifc, "Description", "")
+    if description:
+        attribute_blender.description = description


 def export_attributes(props, callback=None):
@@ -120,29 +178,18 @@ def export_attributes(props, callback=None):
 def prop_with_search(layout, data, prop_name, **kwargs):
    # kwargs are layout.prop arguments (text, icon, etc.)
    row = layout.row(align=True)
-    # Magick courtesy of https://blender.stackexchange.com/a/203443/86891
-    row.context_pointer_set(name="data", data=data)
    row.prop(data, prop_name, **kwargs)
-    op = row.operator("bim.enum_property_search", text="", icon="VIEWZOOM")
-    op.prop_name = prop_name
-
-    add_entity_url_button(row, getattr(data, prop_name))
+    try:
+        if len(get_enum_items(data, prop_name)) > 10:
+            # Magick courtesy of https://blender.stackexchange.com/a/203443/86891
+            row.context_pointer_set(name="data", data=data)
+            op = row.operator("bim.enum_property_search", text="", icon="VIEWZOOM")
+            op.prop_name = prop_name
+    except TypeError:  # Prop is not iterable
+        pass


-def add_entity_url_button(layout, entity):
-    if entity:
-        try:
-            url = get_ifc_entity_doc_url(entity)
-        except KeyError:
-            # TODO : support attributes, pset, etc.
-            pass
-        else:
-            if url:
-                url_op = layout.operator("bim.open_webbrowser", icon="INFO", text="")
-                url_op.url = url
-
-
-def get_enum_items(data, prop_name, context):
+def get_enum_items(data, prop_name, context=None):
    # Retrieve items from a dynamic EnumProperty, which is otherwise not supported
    # Or throws an error in the console when the items callback returns an empty list
    # See https://blender.stackexchange.com/q/215781/86891
@@ -152,7 +199,7 @@ def get_enum_items(data, prop_name, context):
        return
    if not isinstance(items, (list, tuple)):
        # items are retrieved through a callback, not a static list :
-        items = items(data, context)
+        items = items(data, context or bpy.context)
    return items


@@ -161,6 +208,12 @@ def get_obj_ifc_definition_id(context, obj, obj_type):
        return bpy.data.objects.get(obj).BIMObjectProperties.ifc_definition_id
    elif obj_type == "Material":
        return bpy.data.materials.get(obj).BIMObjectProperties.ifc_definition_id
+    elif obj_type == "MaterialSet":
+        return ifcopenshell.util.element.get_material(
+            tool.Ifc.get_entity(bpy.data.objects.get(obj)), should_skip_usage=True
+        ).id()
+    elif obj_type == "MaterialSetItem":
+        return bpy.data.objects.get(obj).BIMObjectMaterialProperties.active_material_set_item_id
    elif obj_type == "Task":
        return context.scene.BIMTaskTreeProperties.tasks[
            context.scene.BIMWorkScheduleProperties.active_task_index
@@ -190,6 +243,30 @@ def close_operator_panel(event):
    bpy.app.timers.register(move_back, first_interval=0.01)


+def convert_property_group_from_si(property_group, skip_props=()):
+    """Method converts property group values from si to current ifc project units
+
+    based on default values of the properties.
+
+    List of properties to skip can be supplied in `skip_props`."""
+    conversion_k = 1.0 / ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+    skip_props = ("rna_type", "name") + skip_props
+    for prop_name in property_group.bl_rna.properties.keys():
+        if prop_name in skip_props:
+            continue
+        prop_bl_rna = property_group.bl_rna.properties[prop_name]
+        if prop_bl_rna.array_length > 0:
+            prop_value = prop_bl_rna.default_array
+        else:
+            prop_value = prop_bl_rna.default
+
+        if type(prop_value) is float:
+            prop_value = prop_value * conversion_k
+        elif type(prop_value) is bpy.types.bpy_prop_array:
+            prop_value = [el * conversion_k for el in prop_value]
+        setattr(property_group, prop_name, prop_value)
+
+
 class IfcHeaderExtractor:
    def __init__(self, filepath: str):
        self.filepath = filepath
@@ -51,6 +51,7 @@ class IfcStore:
    history = []
    future = []
    schema_identifiers = ["IFC4", "IFC2X3", "IFC4X3"]
+    session_files = {}

    @staticmethod
    def purge():
@@ -71,6 +72,7 @@ class IfcStore:
        IfcStore.history = []
        IfcStore.future = []
        IfcStore.schema_identifiers = ["IFC4", "IFC2X3", "IFC4X3"]
+        IfcStore.session_files = {}

    @staticmethod
    def get_file():
@@ -96,7 +98,14 @@ class IfcStore:
            try:
                IfcStore.cache = ifcopenshell.geom.serializers.hdf5(IfcStore.cache_path, cache_settings)
            except:
-                return
+                if os.path.exists(IfcStore.cache_path):
+                    os.remove(IfcStore.cache_path)
+                    try:
+                        IfcStore.cache = ifcopenshell.geom.serializers.hdf5(IfcStore.cache_path, cache_settings)
+                    except:
+                        return
+                else:
+                    return
        return IfcStore.cache

    @staticmethod
@@ -112,7 +112,7 @@ class MaterialCreator:

    def parse_representation(self, representation):
        has_parsed = False
-        representation_items = self.resolve_all_representation_items(representation)
+        representation_items = self.resolve_all_stylable_representation_items(representation)
        for item in representation_items:
            if self.parse_representation_item(item):
                has_parsed = True
@@ -153,11 +153,19 @@ class MaterialCreator:
            ]
            self.mesh.polygons.foreach_set("material_index", material_index)

-    def resolve_all_representation_items(self, representation):
+    def resolve_all_stylable_representation_items(self, representation):
        items = []
        for item in representation.Items:
            if item.is_a("IfcMappedItem"):
                items.extend(item.MappingSource.MappedRepresentation.Items)
+            if item.is_a("IfcBooleanResult"):
+                operand = item.FirstOperand
+                while True:
+                    items.append(operand)
+                    if operand.is_a("IfcBooleanResult"):
+                        operand = operand.FirstOperand
+                    else:
+                        break
            items.append(item)
        return items

@@ -228,8 +236,6 @@ class IfcImporter:
        self.profile_code("Create materials")
        self.create_styles()
        self.profile_code("Create styles")
-        self.create_annotations()
-        self.profile_code("Create annotation")
        self.parse_native_elements()
        self.profile_code("Parsing native elements")
        self.create_native_elements()
@@ -329,11 +335,23 @@ class IfcImporter:
        if self.ifc_import_settings.has_filter or offset or offset_limit < len(self.elements):
            self.element_types = set([ifcopenshell.util.element.get_type(e) for e in self.elements])
        else:
-            self.element_types = set(
-                self.file.by_type("IfcElementType")
-                + self.file.by_type("IfcDoorStyle")
-                + self.file.by_type("IfcWindowStyle")
-            )
+            if self.file.schema == "IFC2X3":
+                self.element_types = set(
+                    self.file.by_type("IfcElementType")
+                    + self.file.by_type("IfcDoorStyle")
+                    + self.file.by_type("IfcWindowStyle")
+                )
+            elif self.file.schema == "IFC4":
+                self.element_types = set(
+                    self.file.by_type("IfcElementType")
+                    + self.file.by_type("IfcDoorStyle")
+                    + self.file.by_type("IfcWindowStyle")
+                    + self.file.by_type("IfcSpatialElementType")
+                )
+            else:
+                self.element_types = set(
+                    self.file.by_type("IfcElementType") + self.file.by_type("IfcSpatialElementType")
+                )

        if self.ifc_import_settings.has_filter and self.ifc_import_settings.should_filter_spatial_elements:
            self.spatial_elements = self.get_spatial_elements_filtered_by_elements(self.elements)
@@ -403,7 +421,7 @@ class IfcImporter:
            items = representation["raw"].Items or []  # Be forgiving of invalid IFCs because Revit :(
            if len(items) == 1 and items[0].is_a("IfcSweptDiskSolid"):
                return True
-            elif len(items) and ( # See #2508 why we accommodate for invalid IFCs here
+            elif len(items) and (  # See #2508 why we accommodate for invalid IFCs here
                items[0].is_a("IfcSweptDiskSolid")
                and len({i.is_a() for i in items}) == 1
                and len({i.Radius for i in items}) == 1
@@ -517,14 +535,21 @@ class IfcImporter:

    def does_element_likely_have_geometry_far_away(self, element):
        for representation in element.Representation.Representations:
-            for subelement in self.file.traverse(representation):
-                if subelement.is_a("IfcCartesianPointList3D"):
-                    for point in subelement.CoordList:
-                        if len(point) == 3 and self.is_point_far_away(point, is_meters=False):
+            items = []
+            for item in representation.Items:
+                if item.is_a("IfcMappedItem"):
+                    items.extend(item.MappingSource.MappedRepresentation.Items)
+                else:
+                    items.append(item)
+            for item in items:
+                for subelement in self.file.traverse(item):
+                    if subelement.is_a("IfcCartesianPointList3D"):
+                        for point in subelement.CoordList:
+                            if len(point) == 3 and self.is_point_far_away(point, is_meters=False):
+                                return True
+                    if subelement.is_a("IfcCartesianPoint"):
+                        if len(subelement.Coordinates) == 3 and self.is_point_far_away(subelement, is_meters=False):
                            return True
-                if subelement.is_a("IfcCartesianPoint"):
-                    if len(subelement.Coordinates) == 3 and self.is_point_far_away(subelement, is_meters=False):
-                        return True

    def apply_blender_offset_to_matrix_world(self, obj, matrix):
        props = bpy.context.scene.BIMGeoreferenceProperties
@@ -568,7 +593,7 @@ class IfcImporter:
            if bpy.context.preferences.addons["blenderbim"].preferences.lock_grids_on_import:
                grid_obj.lock_location = (True, True, True)
                grid_obj.lock_rotation = (True, True, True)
-            collection = bpy.data.collections.new(self.get_name(grid))
+            collection = bpy.data.collections.new(tool.Loader.get_name(grid))
            u_axes = bpy.data.collections.new("UAxes")
            collection.children.link(u_axes)
            v_axes = bpy.data.collections.new("VAxes")
@@ -610,11 +635,11 @@ class IfcImporter:
                try:
                    shape = ifcopenshell.geom.create_shape(self.settings, representation_map.MappedRepresentation)
                    mesh = self.create_mesh(element, shape)
-                    self.link_mesh(shape, mesh)
+                    tool.Loader.link_mesh(shape, mesh)
                    self.meshes[mesh_name] = mesh
                except:
                    self.ifc_import_settings.logger.error("Failed to generate shape for %s", element)
-        obj = bpy.data.objects.new(self.get_name(element), mesh)
+        obj = bpy.data.objects.new(tool.Loader.get_name(element), mesh)
        self.link_element(element, obj)
        self.material_creator.create(element, obj, mesh)
        self.type_products[element.GlobalId] = obj
@@ -669,9 +694,6 @@ class IfcImporter:
    def create_spatial_elements(self):
        self.create_generic_elements(self.spatial_elements)

-    def create_annotations(self):
-        self.create_generic_elements(self.annotations)
-
    def create_elements(self):
        self.create_generic_elements(self.elements)

@@ -905,21 +927,21 @@ class IfcImporter:
            pass
        elif element.is_a("IfcAnnotation") and element.ObjectType == "DRAWING":
            mesh = self.create_camera(element, shape)
-            self.link_mesh(shape, mesh)
+            tool.Loader.link_mesh(shape, mesh)
        elif element.is_a("IfcAnnotation") and self.is_curve_annotation(element) and shape:
            mesh = self.create_curve(element, shape)
-            self.link_mesh(shape, mesh)
+            tool.Loader.link_mesh(shape, mesh)
        elif shape:
-            mesh_name = self.get_mesh_name(shape.geometry)
+            mesh_name = tool.Loader.get_mesh_name(shape.geometry)
            mesh = self.meshes.get(mesh_name)
            if mesh is None:
                mesh = self.create_mesh(element, shape)
-                self.link_mesh(shape, mesh)
+                tool.Loader.link_mesh(shape, mesh)
                self.meshes[mesh_name] = mesh
        else:
            mesh = None

-        obj = bpy.data.objects.new(self.get_name(element), mesh)
+        obj = bpy.data.objects.new(tool.Loader.get_name(element), mesh)
        self.link_element(element, obj)

        if shape:
@@ -972,9 +994,37 @@ class IfcImporter:
            self.convert_representation(representation)

        mesh = bpy.data.meshes.new("Native")
+
+        props = bpy.context.scene.BIMGeoreferenceProperties
+        mat = ifcopenshell.util.placement.get_local_placement(element.ObjectPlacement)
+        if props.has_blender_offset and self.is_point_far_away(self.mesh_data["co"][0:3], is_meters=False):
+            offset_point = np.linalg.inv(mat) @ np.array(
+                (
+                    float(props.blender_eastings),
+                    float(props.blender_northings),
+                    float(props.blender_orthogonal_height),
+                    0.0,
+                )
+            )
+            verts = [None] * len(self.mesh_data["co"])
+            for i in range(0, len(self.mesh_data["co"]), 3):
+                verts[i], verts[i + 1], verts[i + 2] = ifcopenshell.util.geolocation.enh2xyz(
+                    self.mesh_data["co"][i] * self.unit_scale,
+                    self.mesh_data["co"][i + 1] * self.unit_scale,
+                    self.mesh_data["co"][i + 2] * self.unit_scale,
+                    offset_point[0] * self.unit_scale,
+                    offset_point[1] * self.unit_scale,
+                    offset_point[2] * self.unit_scale,
+                    float(props.blender_x_axis_abscissa),
+                    float(props.blender_x_axis_ordinate),
+                )
+            mesh["has_cartesian_point_offset"] = True
+        else:
+            verts = [c * self.unit_scale for c in self.mesh_data["co"]]
+            mesh["has_cartesian_point_offset"] = False
+
        mesh.vertices.add(self.mesh_data["total_verts"])
-        mesh.vertices.foreach_set("co", [c * self.unit_scale for c in self.mesh_data["co"]])
-        # mesh.vertices.foreach_set("co", self.mesh_data["co"])
+        mesh.vertices.foreach_set("co", verts)
        mesh.loops.add(len(self.mesh_data["vertex_index"]))
        mesh.loops.foreach_set("vertex_index", self.mesh_data["vertex_index"])
        mesh.polygons.add(self.mesh_data["total_polygons"])
@@ -1339,6 +1389,13 @@ class IfcImporter:
    def create_spatial_decomposition_collections(self):
        for rel_aggregate in self.project["ifc"].IsDecomposedBy or []:
            self.create_spatial_decomposition_collection(self.project["blender"], rel_aggregate.RelatedObjects)
+
+        # Invalid IFCs may have orphaned spatial structure elements.
+        orphaned_spaces = [e for e in self.spatial_elements if e.GlobalId not in self.collections]
+        while orphaned_spaces:
+            self.create_spatial_decomposition_collection(self.project["blender"], orphaned_spaces)
+            orphaned_spaces = [e for e in self.spatial_elements if e.GlobalId not in self.collections]
+
        self.create_views_collection()
        self.create_type_collection()

@@ -1360,12 +1417,6 @@ class IfcImporter:
        if not view_collection:
            view_collection = bpy.data.collections.new("Views")
            self.project["blender"].children.link(view_collection)
-        for element in self.file.by_type("IfcAnnotation"):
-            if element.ObjectType == "DRAWING":
-                group = [r for r in element.HasAssignments if r.is_a("IfcRelAssignsToGroup")][0].RelatingGroup
-                collection = bpy.data.collections.new("IfcGroup/" + group.Name)
-                self.collections[group.GlobalId] = collection
-                view_collection.children.link(collection)

    def create_spatial_decomposition_collection(self, parent, related_objects):
        for element in related_objects:
@@ -1379,7 +1430,7 @@ class IfcImporter:
                    collection = obj.users_collection[0]
                    self.collections[element.GlobalId] = collection
            if not is_existing:
-                collection = bpy.data.collections.new(self.get_name(element))
+                collection = bpy.data.collections.new(tool.Loader.get_name(element))
                self.collections[element.GlobalId] = collection
                parent.children.link(collection)
            if element.IsDecomposedBy:
@@ -1392,7 +1443,11 @@ class IfcImporter:
            rel_aggregates += [e.Decomposes[0] for e in self.elements if e.Decomposes]
            rel_aggregates = set(rel_aggregates)
        else:
-            rel_aggregates = [a for a in self.file.by_type("IfcRelAggregates") if a.RelatingObject.is_a("IfcElement")]
+            rel_aggregates = [
+                a
+                for a in self.file.by_type("IfcRelAggregates")
+                if a.RelatingObject.is_a("IfcElement") or a.RelatingObject.is_a("IfcElementType")
+            ]

        if len(rel_aggregates) > 10000:
            # More than 10,000 collections makes Blender unhappy
@@ -1403,7 +1458,7 @@ class IfcImporter:
        aggregates = {}
        for rel_aggregate in rel_aggregates:
            element = rel_aggregate.RelatingObject
-            collection = bpy.data.collections.new(self.get_name(element))
+            collection = bpy.data.collections.new(tool.Loader.get_name(element))
            aggregates[element.GlobalId] = {"element": element, "collection": collection}
            self.collections[element.GlobalId] = collection

@@ -1415,6 +1470,10 @@ class IfcImporter:
            parent = ifcopenshell.util.element.get_container(aggregate["element"])
            if parent:
                self.collections[parent.GlobalId].children.link(aggregate["collection"])
+                continue
+            if aggregate["element"].is_a("IfcElementType"):
+                self.type_collection.children.link(aggregate["collection"])
+                continue

    def create_materials(self):
        for material in self.file.by_type("IfcMaterial"):
@@ -1630,9 +1689,6 @@ class IfcImporter:
                else:
                    blender_material.node_tree.links.new(coord.outputs["UV"], node.inputs["Vector"])

-    def get_name(self, element):
-        return "{}/{}".format(element.is_a(), element.Name)
-
    def place_objects_in_collections(self):
        for ifc_definition_id, obj in self.added_data.items():
            if isinstance(obj, bpy.types.Object):
@@ -1703,7 +1759,7 @@ class IfcImporter:

    def get_drawing_group(self, element):
        for rel in element.HasAssignments or []:
-            if rel.is_a("IfcRelAssignsToGroup"):
+            if rel.is_a("IfcRelAssignsToGroup") and rel.RelatingGroup.ObjectType == "DRAWING":
                return rel.RelatingGroup

    def get_element_matrix(self, element):
@@ -1780,16 +1836,6 @@ class IfcImporter:
            ):
                return representation.Items[0].MappingTarget

-    def get_mesh_name(self, geometry):
-        representation_id = geometry.id
-        if "-" in representation_id:
-            representation_id = int(re.sub(r"\D", "", representation_id.split("-")[0]))
-        else:
-            representation_id = int(re.sub(r"\D", "", representation_id))
-        representation = self.file.by_id(representation_id)
-        context_id = representation.ContextOfItems.id() if hasattr(representation, "ContextOfItems") else 0
-        return "{}/{}".format(context_id, representation_id)
-
    def create_camera(self, element, shape):
        if hasattr(shape, "geometry"):
            geometry = shape.geometry
@@ -1804,7 +1850,7 @@ class IfcImporter:
        height = max(y) - min(y)
        depth = max(z) - min(z)

-        camera = bpy.data.cameras.new(self.get_mesh_name(geometry))
+        camera = bpy.data.cameras.new(tool.Loader.get_mesh_name(geometry))
        camera.type = "ORTHO"
        camera.ortho_scale = width if width > height else height
        camera.clip_end = depth
@@ -1844,7 +1890,7 @@ class IfcImporter:
        else:
            geometry = shape

-        curve = bpy.data.curves.new(self.get_mesh_name(geometry), type="CURVE")
+        curve = bpy.data.curves.new(tool.Loader.get_mesh_name(geometry), type="CURVE")
        curve.dimensions = "3D"
        curve.resolution_u = 2

@@ -1870,7 +1916,7 @@ class IfcImporter:
            else:
                geometry = shape

-            mesh = bpy.data.meshes.new(self.get_mesh_name(geometry))
+            mesh = bpy.data.meshes.new(tool.Loader.get_mesh_name(geometry))

            props = bpy.context.scene.BIMGeoreferenceProperties
            if (
@@ -1985,17 +2031,6 @@ class IfcImporter:
        self.added_data[element.id()] = obj
        IfcStore.link_element(element, obj)

-    def link_mesh(self, shape, mesh):
-        if hasattr(shape, "geometry"):
-            geometry = shape.geometry
-        else:
-            geometry = shape
-        if "-" in geometry.id:
-            mesh.BIMMeshProperties.ifc_definition_id = int(geometry.id.split("-")[0])
-        else:
-            # TODO: See #2002
-            mesh.BIMMeshProperties.ifc_definition_id = int(geometry.id.replace(",", ""))
-
    def set_matrix_world(self, obj, matrix_world):
        obj.matrix_world = matrix_world
        tool.Geometry.record_object_position(obj)
@@ -25,7 +25,6 @@ import blenderbim.bim.handler
 import blenderbim.tool as tool
 import blenderbim.core.attribute as core
 from blenderbim.bim.ifc import IfcStore
-from ifcopenshell.api.attribute.data import Data


 class Operator:
@@ -51,8 +50,6 @@ class EnableEditingAttributes(bpy.types.Operator):
        oprops = obj.BIMObjectProperties
        props = obj.BIMAttributeProperties
        props.attributes.clear()
-        if oprops.ifc_definition_id not in Data.products:
-            Data.load(IfcStore.get_file(), oprops.ifc_definition_id)
        blenderbim.bim.helper.import_attributes2(tool.Ifc.get().by_id(oprops.ifc_definition_id), props.attributes)
        props.is_editing_attributes = True
        return {"FINISHED"}
@@ -88,33 +85,10 @@ class EditAttributes(bpy.types.Operator, Operator):
            obj = bpy.data.objects.get(self.obj)
        elif self.obj_type == "Material":
            obj = bpy.data.materials.get(self.obj)
-        oprops = obj.BIMObjectProperties
        props = obj.BIMAttributeProperties
-        attributes = {}
-        for attribute in Data.products[oprops.ifc_definition_id]:
-            blender_attribute = props.attributes.get(attribute["name"])
-            if not blender_attribute:
-                continue
-            if attribute["is_optional"] and blender_attribute.is_null:
-                attributes[attribute["name"]] = None
-            elif attribute["type"] == "string":
-                attributes[attribute["name"]] = blender_attribute.string_value
-            elif attribute["type"] == "list":
-                values = blender_attribute.string_value[1:-1].split(", ")
-                if attribute["list_type"] == "float":
-                    values = [float(v) for v in values]
-                elif attribute["list_type"] == "integer":
-                    values = [int(v) for v in values]
-                attributes[attribute["name"]] = values
-            elif attribute["type"] == "integer":
-                attributes[attribute["name"]] = blender_attribute.int_value
-            elif attribute["type"] == "float":
-                attributes[attribute["name"]] = blender_attribute.float_value
-            elif attribute["type"] == "enum":
-                attributes[attribute["name"]] = blender_attribute.enum_value
-        product = self.file.by_id(oprops.ifc_definition_id)
-        ifcopenshell.api.run("attribute.edit_attributes", self.file, **{"product": product, "attributes": attributes})
-        Data.load(IfcStore.get_file(), oprops.ifc_definition_id)
+        product = tool.Ifc.get_entity(obj)
+        attributes = blenderbim.bim.helper.export_attributes(props.attributes)
+        ifcopenshell.api.run("attribute.edit_attributes", self.file, product=product, attributes=attributes)
        bpy.ops.bim.disable_editing_attributes(obj=obj.name, obj_type=self.obj_type)
        return {"FINISHED"}

@@ -143,5 +117,5 @@ class CopyAttributeToSelection(bpy.types.Operator, Operator):

    def _execute(self, context):
        value = context.active_object.BIMAttributeProperties.attributes.get(self.name).get_value()
-        for obj in context.selected_objects:
+        for obj in tool.Blender.get_selected_objects():
            core.copy_attribute_to_selection(tool.Ifc, name=self.name, value=value, obj=obj)
@@ -20,43 +20,44 @@ import bpy
 from . import ui, prop, operator

 classes = (
-    operator.NewBcfProject,
-    operator.LoadBcfProject,
-    operator.LoadBcfTopics,
-    operator.LoadBcfTopic,
-    operator.LoadBcfComments,
-    operator.EditBcfProjectName,
-    operator.EditBcfAuthor,
-    operator.EditBcfTopicName,
-    operator.EditBcfTopic,
-    operator.SaveBcfProject,
-    operator.AddBcfTopic,
-    operator.AddBcfHeaderFile,
-    operator.AddBcfBimSnippet,
-    operator.AddBcfReferenceLink,
-    operator.AddBcfDocumentReference,
-    operator.AddBcfLabel,
-    operator.AddBcfRelatedTopic,
-    operator.ViewBcfTopic,
-    operator.RemoveBcfTopic,
-    operator.RemoveBcfComment,
-    operator.RemoveBcfBimSnippet,
-    operator.RemoveBcfReferenceLink,
-    operator.RemoveBcfDocumentReference,
-    operator.RemoveBcfRelatedTopic,
-    operator.EditBcfReferenceLinks,
-    operator.EditBcfLabels,
-    operator.RemoveBcfLabel,
-    operator.EditBcfComment,
-    operator.AddBcfComment,
    operator.ActivateBcfViewpoint,
+    operator.AddBcfBimSnippet,
+    operator.AddBcfComment,
+    operator.AddBcfDocumentReference,
+    operator.AddBcfHeaderFile,
+    operator.AddBcfLabel,
+    operator.AddBcfReferenceLink,
+    operator.AddBcfRelatedTopic,
+    operator.AddBcfTopic,
    operator.AddBcfViewpoint,
-    operator.RemoveBcfViewpoint,
-    operator.RemoveBcfFile,
+    operator.EditBcfAuthor,
+    operator.EditBcfComment,
+    operator.EditBcfLabels,
+    operator.EditBcfProjectName,
+    operator.EditBcfReferenceLinks,
+    operator.EditBcfTopic,
+    operator.EditBcfTopicName,
+    operator.ExtractBcfFile,
+    operator.LoadBcfComments,
+    operator.LoadBcfProject,
+    operator.LoadBcfTopic,
+    operator.LoadBcfTopics,
+    operator.NewBcfProject,
    operator.OpenBcfReferenceLink,
-    operator.SelectBcfHeaderFile,
+    operator.RemoveBcfBimSnippet,
+    operator.RemoveBcfComment,
+    operator.RemoveBcfDocumentReference,
+    operator.RemoveBcfFile,
+    operator.RemoveBcfLabel,
+    operator.RemoveBcfReferenceLink,
+    operator.RemoveBcfRelatedTopic,
+    operator.RemoveBcfTopic,
+    operator.RemoveBcfViewpoint,
+    operator.SaveBcfProject,
    operator.SelectBcfBimSnippetReference,
    operator.SelectBcfDocumentReference,
+    operator.SelectBcfHeaderFile,
+    operator.ViewBcfTopic,
    prop.BcfReferenceLink,
    prop.BcfLabel,
    prop.BcfBimSnippet,
@@ -28,3 +28,7 @@ class BcfStore:
        if not BcfStore.bcfxml:
            BcfStore.bcfxml = bcf.v2.bcfxml.BcfXml()
        return BcfStore.bcfxml
+
+    @classmethod
+    def set(cls, bcfxml):
+        cls.bcfxml = bcfxml
@@ -20,15 +20,20 @@ import os
 import bpy
 import bcf
 import bcf.bcfxml
-import bcf.v2.data
+import bcf.v2.model
+import uuid
 import numpy as np
+import tempfile
+import webbrowser
 import ifcopenshell
 import ifcopenshell.util.unit
-from . import bcfstore
 import blenderbim.bim.module.bcf.prop as bcf_prop
+from . import bcfstore
+from pathlib import Path
 from blenderbim.bim.ifc import IfcStore
 from math import radians, degrees, atan, tan, cos, sin
 from mathutils import Vector, Matrix, Euler, geometry
+from xsdata.models.datatype import XmlDateTime


 class NewBcfProject(bpy.types.Operator):
@@ -38,8 +43,8 @@ class NewBcfProject(bpy.types.Operator):

    def execute(self, context):
        context.scene.BCFProperties.is_loaded = False
-        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.new_project()
+        bcfxml = bcf.v2.bcfxml.BcfXml.create_new("New Project")
+        bcfstore.BcfStore.set(bcfxml)
        bpy.ops.bim.load_bcf_project()
        context.scene.BCFProperties.is_loaded = True
        return {"FINISHED"}
@@ -57,7 +62,6 @@ class LoadBcfProject(bpy.types.Operator):
        if self.filepath:
            bcfstore.BcfStore.bcfxml = bcf.bcfxml.load(self.filepath)
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.get_project()
        context.scene.BCFProperties.name = bcfxml.project.name
        bpy.ops.bim.load_bcf_topics()
        context.scene.BCFProperties.is_loaded = True
@@ -75,7 +79,6 @@ class LoadBcfTopics(bpy.types.Operator):

    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.get_topics()
        context.scene.BCFProperties.topics.clear()
        for index, topic_guid in enumerate(bcfxml.topics.keys()):
            new = context.scene.BCFProperties.topics.add()
@@ -92,51 +95,51 @@ class LoadBcfTopic(bpy.types.Operator):

    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        topic = bcfxml.get_topic(self.topic_guid)
+        topic = bcfxml.topics[self.topic_guid]
        bcfxml.get_header(self.topic_guid)
        new = context.scene.BCFProperties.topics[self.topic_index]
        data_map = {
            "name": topic.guid,
-            "title": topic.title,
-            "type": topic.topic_type,
-            "status": topic.topic_status,
-            "priority": topic.priority,
-            "stage": topic.stage,
-            "creation_date": topic.creation_date,
-            "creation_author": topic.creation_author,
-            "modified_date": topic.modified_date,
-            "modified_author": topic.modified_author,
-            "assigned_to": topic.assigned_to,
-            "due_date": topic.due_date,
-            "description": topic.description,
+            "title": topic.topic.title,
+            "type": topic.topic.topic_type,
+            "status": topic.topic.topic_status,
+            "priority": topic.topic.priority,
+            "stage": topic.topic.stage,
+            "creation_date": topic.topic.creation_date,
+            "creation_author": topic.topic.creation_author,
+            "modified_date": topic.topic.modified_date,
+            "modified_author": topic.topic.modified_author,
+            "assigned_to": topic.topic.assigned_to,
+            "due_date": topic.topic.due_date,
+            "description": topic.topic.description,
        }
        for key, value in data_map.items():
            if value is not None:
                setattr(new, key, str(value))

        new.reference_links.clear()
-        for reference_link in topic.reference_links:
+        for reference_link in topic.topic.reference_link:
            new_reference_link = new.reference_links.add()
            new_reference_link.name = reference_link

        new.labels.clear()
-        for label in topic.labels:
+        for label in topic.topic.labels:
            new_label = new.labels.add()
            new_label.name = label

-        if topic.bim_snippet:
+        if topic.topic.bim_snippet:
            data_map = {
-                "type": topic.bim_snippet.snippet_type,
-                "is_external": topic.bim_snippet.is_external,
-                "reference": topic.bim_snippet.reference,
-                "schema": topic.bim_snippet.reference_schema,
+                "type": topic.topic.bim_snippet.snippet_type,
+                "is_external": topic.topic.bim_snippet.is_external,
+                "reference": topic.topic.bim_snippet.reference,
+                "schema": topic.topic.bim_snippet.reference_schema,
            }
            for key, value in data_map.items():
                if value is not None:
                    setattr(new.bim_snippet, key, value)

        new.document_references.clear()
-        for doc in topic.document_references:
+        for doc in topic.topic.document_reference:
            new_document_references = new.document_references.add()
            data_map = {
                "reference": doc.referenced_document,
@@ -149,7 +152,7 @@ class LoadBcfTopic(bpy.types.Operator):
                    setattr(new_document_references, key, value)

        new.related_topics.clear()
-        for related_topic in topic.related_topics:
+        for related_topic in topic.topic.related_topic:
            new_related_topic = new.related_topics.add()
            new_related_topic.name = related_topic.guid

@@ -165,10 +168,9 @@ class LoadBcfComments(bpy.types.Operator):

    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.get_comments(self.topic_guid)
        blender_topic = context.scene.BCFProperties.topics.get(self.topic_guid)
        blender_topic.comments.clear()
-        for comment in bcfxml.topics[self.topic_guid].comments.values():
+        for comment in bcfxml.topics[self.topic_guid].comments:
            new = blender_topic.comments.add()
            data_map = {
                "name": comment.guid,
@@ -193,7 +195,6 @@ class EditBcfProjectName(bpy.types.Operator):
    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        bcfxml.project.name = context.scene.BCFProperties.name
-        bcfxml.edit_project()
        return {"FINISHED"}


@@ -219,7 +220,6 @@ class EditBcfTopicName(bpy.types.Operator):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        topic = bcfxml.topics[blender_topic.name]
        topic.title = blender_topic.title
-        bcfxml.edit_topic(topic)
        return {"FINISHED"}


@@ -243,7 +243,6 @@ class EditBcfTopic(bpy.types.Operator):
        topic.topic_status = blender_topic.status or None
        topic.topic_type = blender_topic.type or None

-        bcfxml.edit_topic(topic)
        props.refresh_topic(context)
        return {"FINISHED"}

@@ -257,7 +256,7 @@ class SaveBcfProject(bpy.types.Operator):

    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.save_project(self.filepath)
+        bcfxml.save(self.filepath)
        return {"FINISHED"}

    def invoke(self, context, event):
@@ -276,7 +275,7 @@ class AddBcfTopic(bpy.types.Operator):

    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
-        bcfxml.add_topic()
+        bcfxml.add_topic("New Topic", "", context.scene.BCFProperties.author)
        bpy.ops.bim.load_bcf_topics()
        return {"FINISHED"}

@@ -300,15 +299,17 @@ class AddBcfBimSnippet(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        bim_snippet = bcf.v2.data.BimSnippet()
-        bim_snippet.reference = props.bim_snippet_reference
-        bim_snippet.reference_schema = props.bim_snippet_schema
-        bim_snippet.snippet_type = props.bim_snippet_type
-        bcfxml.add_bim_snippet(topic, bim_snippet)
+        is_external = "://" in props.bim_snippet_reference
+        bim_snippet = bcf.v2.model.BimSnippet(
+            reference=props.bim_snippet_reference if is_external else Path(props.bim_snippet_reference).name,
+            reference_schema=props.bim_snippet_schema,
+            snippet_type=props.bim_snippet_type,
+            is_external=is_external,
+        )
+        topic.topic.bim_snippet = bim_snippet
+        with open(props.bim_snippet_reference, "r") as f:
+            topic.bim_snippet = f.read()
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
-        bim_snippet.reference = ""
-        bim_snippet.reference_schema = ""
-        bim_snippet.snippet_type = ""
        return {"FINISHED"}


@@ -327,15 +328,14 @@ class AddBcfRelatedTopic(bpy.types.Operator):
        if props.related_topic == blender_topic.title:
            # Prevent adding self as related topic
            return False
-        related_topic = None
+        related_topic_guid = None
        for topic in bcfxml.topics.values():
-            if topic.title == props.related_topic:
-                related_topic = bcf.v2.data.RelatedTopic()
-                related_topic.guid = topic.guid
+            if topic.topic.title == props.related_topic:
+                related_topic_guid = topic.guid
                break
-        if not related_topic:
+        if not related_topic_guid:
            return False
-        if str(related_topic.guid) in [t.name for t in blender_topic.related_topics]:
+        if str(related_topic_guid) in [t.name for t in blender_topic.related_topics]:
            # Prevent adding the same related topic more than once
            return False
        return True
@@ -344,11 +344,12 @@ class AddBcfRelatedTopic(bpy.types.Operator):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
-        related_topic = bcf.v2.data.RelatedTopic()
-        related_topic.guid = next((t for t in bcfxml.topics.values() if t.title == props.related_topic)).guid
        topic = bcfxml.topics[blender_topic.name]
-        topic.related_topics.append(related_topic)
-        bcfxml.edit_topic(topic)
+        topic.topic.related_topic.append(
+            bcf.v2.model.TopicRelatedTopic(
+                guid=next((t for t in bcfxml.topics.values() if t.topic.title == props.related_topic)).guid
+            )
+        )
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
        props.related_topic = ""
        return {"FINISHED"}
@@ -368,15 +369,24 @@ class AddBcfHeaderFile(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        header_file = bcf.v2.data.HeaderFile()
-        header_file.reference = props.file_reference
-        if not os.path.exists(header_file.reference):
-            header_file.filename = header_file.reference
-        if len(props.file_ifc_project) == 22:
-            header_file.ifc_project = props.file_ifc_project
-        if len(props.file_ifc_spatial_structure_element) == 22:
-            header_file.ifc_spatial_structure_element = props.file_ifc_spatial_structure_element
-        bcfxml.add_file(topic, header_file)
+
+        is_external = "://" in props.file_reference
+        filename = Path(props.file_reference).name if os.path.exists(props.file_reference) else None
+
+        if filename:
+            with open(props.file_reference, "r") as f:
+                topic.reference_files[filename] = f.read()
+
+        header_file = bcf.v2.model.HeaderFile(
+            filename=filename,
+            date=XmlDateTime.now(),
+            reference=props.file_reference if is_external else Path(props.file_reference).name,
+            ifc_project=props.file_ifc_project,
+            ifc_spatial_structure_element=props.file_ifc_spatial_structure_element,
+            is_external=is_external,
+        )
+        topic.header.file.append(header_file)
+
        props.refresh_topic(context)
        return {"FINISHED"}

@@ -410,27 +420,34 @@ class AddBcfViewpoint(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        viewpoint = bcf.v2.data.Viewpoint()

-        if blender_camera.data.type == "ORTHO":
-            camera = bcf.v2.data.OrthogonalCamera()
-            camera.view_to_world_scale = blender_camera.data.ortho_scale
-            viewpoint.orthogonal_camera = camera
-        elif blender_camera.data.type == "PERSP":
-            camera = bcf.v2.data.PerspectiveCamera()
-            camera.field_of_view = degrees(blender_camera.data.angle)
-            viewpoint.perspective_camera = camera
-        camera.camera_view_point.x = blender_camera.location.x
-        camera.camera_view_point.y = blender_camera.location.y
-        camera.camera_view_point.z = blender_camera.location.z
        direction = blender_camera.matrix_world.to_quaternion() @ Vector((0.0, 0.0, -1.0))
-        camera.camera_direction.x = direction.x
-        camera.camera_direction.y = direction.y
-        camera.camera_direction.z = direction.z
        up = blender_camera.matrix_world.to_quaternion() @ Vector((0.0, 1.0, 0.0))
-        camera.camera_up_vector.x = up.x
-        camera.camera_up_vector.y = up.y
-        camera.camera_up_vector.z = up.z
+
+        camera_view_point = bcf.v2.model.Point(
+            x=blender_camera.location.x, y=blender_camera.location.y, z=blender_camera.location.z
+        )
+        camera_direction = bcf.v2.model.Direction(x=direction.x, y=direction.y, z=direction.z)
+        camera_up_vector = bcf.v2.model.Direction(x=up.x, y=up.y, z=up.z)
+        if blender_camera.data.type == "ORTHO":
+            camera = bcf.v2.model.OrthogonalCamera(
+                view_to_world_scale=blender_camera.data.ortho_scale,
+                camera_view_point=camera_view_point,
+                camera_direction=camera_direction,
+                camera_up_vector=camera_up_vector,
+            )
+            visualization_info = bcf.v2.model.VisualizationInfo(orthogonal_camera=camera)
+        elif blender_camera.data.type == "PERSP":
+            camera = bcf.v2.model.PerspectiveCamera(
+                field_of_view=degrees(blender_camera.data.angle),
+                camera_view_point=camera_view_point,
+                camera_direction=camera_direction,
+                camera_up_vector=camera_up_vector,
+            )
+            visualization_info = bcf.v2.model.VisualizationInfo(guid=str(uuid.uuid4()), perspective_camera=camera)
+
+        # TODO allow the user to enable or disable snapshotting
+        snapshot = None

        blender_render = context.scene.render
        old_file_format = blender_render.image_settings.file_format
@@ -438,9 +455,17 @@ class AddBcfViewpoint(bpy.types.Operator):
        old_filepath = blender_render.filepath
        blender_render.filepath = os.path.join(context.scene.BIMProperties.data_dir, "snapshot.png")
        bpy.ops.render.opengl(write_still=True)
-        viewpoint.snapshot = blender_render.filepath
+        with open(blender_render.filepath, "rb") as f:
+            snapshot = f.read()
+        # viewpoint.snapshot = blender_render.filepath
+
+        # TODO we should handle selection and visibility state
+        vizinfo = bcf.v2.visinfo.VisualizationInfoHandler(visualization_info=visualization_info, snapshot=snapshot)
+        topic.viewpoints[vizinfo.guid + ".bcfv"] = vizinfo
+        topic.markup.viewpoints.append(
+            bcf.v2.model.ViewPoint(viewpoint=vizinfo.guid + ".bcfv", guid=vizinfo.guid, snapshot=vizinfo.guid + ".png")
+        )

-        bcfxml.add_viewpoint(topic, viewpoint)
        blender_render.filepath = old_filepath
        blender_render.image_settings.file_format = old_file_format
        props.refresh_topic(context)
@@ -460,9 +485,15 @@ class RemoveBcfViewpoint(bpy.types.Operator):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
-        viewpoint_guid = blender_topic.viewpoints
        topic = bcfxml.topics[blender_topic.name]
-        bcfxml.delete_viewpoint(viewpoint_guid, topic)
+        for key, viewpoint in topic.viewpoints.items():
+            if viewpoint.guid == blender_topic.viewpoints:
+                break
+        del topic.viewpoints[key]
+        for i, viewpoint in enumerate(topic.markup.viewpoints):
+            if viewpoint.guid == blender_topic.viewpoints:
+                break
+        del topic.markup.viewpoints[i]
        props.refresh_topic(context)
        return {"FINISHED"}

@@ -478,7 +509,7 @@ class RemoveBcfFile(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        bcfxml.delete_file(topic, self.index)
+        del topic.header.file[self.index]
        props.refresh_topic(context)
        return {"FINISHED"}

@@ -496,8 +527,7 @@ class RemoveBcfTopic(bpy.types.Operator):
    def execute(self, context):
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        props = context.scene.BCFProperties
-        topic_to_delete = props.active_topic
-        bcfxml.delete_topic(topic_to_delete.name)
+        del bcfxml.topics[props.active_topic.name]
        bpy.ops.bim.load_bcf_topics()
        return {"FINISHED"}

@@ -516,8 +546,7 @@ class AddBcfReferenceLink(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        topic.reference_links.append(props.reference_link)
-        bcfxml.edit_topic(topic)
+        topic.topic.reference_link.append(props.reference_link)
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
        props.reference_link = ""
        return {"FINISHED"}
@@ -537,10 +566,23 @@ class AddBcfDocumentReference(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        document_reference = bcf.v2.data.DocumentReference()
-        document_reference.referenced_document = props.document_reference
-        document_reference.description = props.document_reference_description or None
-        bcfxml.add_document_reference(topic, document_reference)
+
+        is_external = "://" in props.document_reference
+        filename = Path(props.document_reference).name if os.path.exists(props.document_reference) else None
+
+        if filename:
+            with open(props.document_reference, "rb") as f:
+                topic.document_references[filename] = f.read()
+
+        document_reference = bcf.v2.model.TopicDocumentReference(
+            referenced_document=props.document_reference if is_external else filename,
+            description=props.document_reference_description or None,
+            guid=str(uuid.uuid4()),
+            is_external=is_external,
+        )
+
+        topic.topic.document_reference.append(document_reference)
+
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
        props.document_reference = ""
        props.document_reference_description = ""
@@ -563,8 +605,7 @@ class AddBcfLabel(bpy.types.Operator):
        topic = bcfxml.topics[blender_topic.name]
        new = blender_topic.labels.add()
        new.name = props.label
-        topic.labels.append(props.label)
-        bcfxml.edit_topic(topic)
+        topic.topic.labels.append(props.label)
        props.label = ""
        return {"FINISHED"}

@@ -579,11 +620,10 @@ class EditBcfReferenceLinks(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        for index, reference_link in enumerate(topic.reference_links):
+        for index, reference_link in enumerate(topic.topic.reference_link):
            if reference_link == blender_topic.reference_links[index].name:
                continue
-            topic.reference_links[index] = blender_topic.reference_links[index].name
-        bcfxml.edit_topic(topic)
+            topic.topic.reference_link[index] = blender_topic.reference_links[index].name
        return {"FINISHED"}


@@ -598,12 +638,11 @@ class EditBcfLabels(bpy.types.Operator):
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
        for index, label in enumerate(blender_topic.labels):
-            if index >= len(topic.labels):
+            if index >= len(topic.topic.labels):
                break
-            if label.name == topic.labels[index]:
+            if label.name == topic.topic.labels[index]:
                continue
-            topic.labels[index] = blender_topic.labels[index].name
-        bcfxml.edit_topic(topic)
+            topic.topic.labels[index] = blender_topic.labels[index].name
        return {"FINISHED"}


@@ -618,8 +657,7 @@ class RemoveBcfReferenceLink(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        del topic.reference_links[self.index]
-        bcfxml.edit_topic(topic)
+        del topic.topic.reference_link[self.index]
        blender_topic.reference_links.remove(self.index)
        return {"FINISHED"}

@@ -635,8 +673,7 @@ class RemoveBcfLabel(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        del topic.labels[self.index]
-        bcfxml.edit_topic(topic)
+        del topic.topic.labels[self.index]
        blender_topic.labels.remove(self.index)
        return {"FINISHED"}

@@ -651,7 +688,7 @@ class RemoveBcfBimSnippet(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        bcfxml.delete_bim_snippet(topic)
+        topic.topic.bim_snippet = None
        blender_topic.bim_snippet.schema = ""
        blender_topic.bim_snippet.reference = ""
        blender_topic.bim_snippet.type = ""
@@ -669,7 +706,7 @@ class RemoveBcfDocumentReference(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        bcfxml.delete_document_reference(topic, self.index)
+        del topic.topic.document_reference[self.index]
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
        return {"FINISHED"}

@@ -685,8 +722,7 @@ class RemoveBcfRelatedTopic(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        del topic.related_topics[self.index]
-        bcfxml.edit_topic(topic)
+        del topic.topic.related_topic[self.index]
        bpy.ops.bim.load_bcf_topic(topic_guid=topic.guid, topic_index=props.active_topic_index)
        return {"FINISHED"}

@@ -702,7 +738,10 @@ class RemoveBcfComment(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        bcfxml.delete_comment(self.comment_guid, topic)
+        for i, comment in enumerate(topic.comments):
+            if comment.guid == self.comment_guid:
+                break
+        del topic.comments[i]
        bpy.ops.bim.load_bcf_comments(topic_guid=topic.guid)
        return {"FINISHED"}

@@ -719,9 +758,11 @@ class EditBcfComment(bpy.types.Operator):
        blender_topic = props.active_topic
        blender_comment = blender_topic.comments.get(self.comment_guid)
        topic = bcfxml.topics[blender_topic.name]
-        comment = topic.comments[self.comment_guid]
-        comment.comment = blender_comment.comment
-        bcfxml.edit_comment(comment, topic)
+        for i, comment in enumerate(topic.comments):
+            if comment.guid == self.comment_guid:
+                comment.comment = blender_comment.comment
+                comment.modified_date = XmlDateTime.now()
+                comment.modified_author = context.scene.BCFProperties.author
        bpy.ops.bim.load_bcf_comments(topic_guid=topic.guid)
        return {"FINISHED"}

@@ -746,12 +787,15 @@ class AddBcfComment(bpy.types.Operator):
        props = context.scene.BCFProperties
        blender_topic = props.active_topic
        topic = bcfxml.topics[blender_topic.name]
-        comment = bcf.v2.data.Comment()
-        comment.comment = props.comment
+        comment = bcf.v2.model.Comment(
+            date=XmlDateTime.now(),
+            author=context.scene.BCFProperties.author,
+            comment=props.comment,
+            guid=str(uuid.uuid4()),
+        )
        if props.has_related_viewpoint:
-            comment.viewpoint = bcf.v2.data.Viewpoint()
-            comment.viewpoint.guid = blender_topic.viewpoints
-        bcfxml.add_comment(topic, comment)
+            comment.viewpoint = bcf.v2.model.CommentViewpoint(guid=blender_topic.viewpoints)
+        topic.comments.append(comment)
        bpy.ops.bim.load_bcf_comments(topic_guid=topic.guid)
        props.comment = ""
        props.has_related_viewpoint = False
@@ -792,11 +836,13 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        cam_height = context.scene.render.resolution_y
        cam_aspect = cam_width / cam_height

+        obj.data.background_images.clear()
        if viewpoint.snapshot:
            obj.data.show_background_images = True
-            obj.data.background_images.clear()
            background = obj.data.background_images.new()
-            background.image = bpy.data.images.load(os.path.join(bcfxml.filepath, topic.guid, viewpoint.snapshot))
+            with tempfile.NamedTemporaryFile(delete=False) as f:
+                f.write(viewpoint.snapshot)
+                background.image = bpy.data.images.load(f.name)
            src_width = background.image.size[0]
            src_height = background.image.size[1]
            src_aspect = src_width / src_height
@@ -806,6 +852,9 @@ class ActivateBcfViewpoint(bpy.types.Operator):
            else:
                background.frame_method = "CROP"
            background.display_depth = "FRONT"
+        else:
+            obj.data.show_background_images = False
+
        area = next(area for area in context.screen.areas if area.type == "VIEW_3D")
        area.spaces[0].region_3d.view_perspective = "CAMERA"

@@ -815,27 +864,27 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        gp = bpy.data.grease_pencils.get("BCF")
        if gp:
            bpy.data.grease_pencils.remove(gp)
-        if viewpoint.lines:
+        if viewpoint.visualization_info.lines:
            self.draw_lines(viewpoint, context)

        self.delete_clipping_planes(context)
-        if viewpoint.clipping_planes:
+        if viewpoint.visualization_info.clipping_planes:
            self.create_clipping_planes(viewpoint)

        self.delete_bitmaps(context)
-        if viewpoint.bitmaps:
+        if viewpoint.visualization_info.bitmap:
            self.create_bitmaps(bcfxml, viewpoint, topic)

        self.setup_camera(viewpoint, obj, cam_aspect, context)
        return {"FINISHED"}

    def setup_camera(self, viewpoint, obj, cam_aspect, context):
-        if viewpoint.orthogonal_camera:
-            camera = viewpoint.orthogonal_camera
+        if viewpoint.visualization_info.orthogonal_camera:
+            camera = viewpoint.visualization_info.orthogonal_camera
            obj.data.type = "ORTHO"
-            obj.data.ortho_scale = viewpoint.orthogonal_camera.view_to_world_scale
-        elif viewpoint.perspective_camera:
-            camera = viewpoint.perspective_camera
+            obj.data.ortho_scale = viewpoint.visualization_info.orthogonal_camera.view_to_world_scale
+        elif viewpoint.visualization_info.perspective_camera:
+            camera = viewpoint.visualization_info.perspective_camera
            obj.data.type = "PERSP"
            if cam_aspect >= 1:
                obj.data.angle = radians(camera.field_of_view)
@@ -876,15 +925,15 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        obj.matrix_world = Matrix(matrix.tolist())

    def set_viewpoint_components(self, viewpoint, context):
-        if not viewpoint.components:
+        if not viewpoint.visualization_info.components:
            return

        # Operators with context overrides are used because they are
        # significantly faster than looping through all objects

-        exception_global_ids = {v.ifc_guid for v in viewpoint.components.visibility.exceptions}
+        exception_global_ids = {v.ifc_guid for v in viewpoint.visualization_info.components.visibility.exceptions or []}

-        if viewpoint.components.visibility.default_visibility:
+        if viewpoint.visualization_info.components.visibility.default_visibility:
            old = context.area.type
            context.area.type = "VIEW_3D"
            bpy.ops.object.hide_view_clear()
@@ -908,11 +957,13 @@ class ActivateBcfViewpoint(bpy.types.Operator):
                bpy.ops.object.hide_view_set(context_override, unselected=True)
                context.area.type = old

-        if viewpoint.components.view_setup_hints:
-            if not viewpoint.components.view_setup_hints.spaces_visible:
+        if viewpoint.visualization_info.components.view_setup_hints:
+            if not viewpoint.visualization_info.components.view_setup_hints.spaces_visible:
                self.hide_spaces(context)
-            if viewpoint.components.view_setup_hints.openings_visible is not None:
-                self.set_openings_visibility(viewpoint.components.view_setup_hints.openings_visible, context)
+            if viewpoint.visualization_info.components.view_setup_hints.openings_visible is not None:
+                self.set_openings_visibility(
+                    viewpoint.visualization_info.components.view_setup_hints.openings_visible, context
+                )
        else:
            self.hide_spaces(context)
            self.set_openings_visibility(False, context)
@@ -928,11 +979,12 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        context.area.type = old

    def set_openings_visibility(self, is_visible, context):
-        for collection in self.get_opening_collections(context):
-            collection.hide_viewport = not is_visible
+        pass # We no longer have an openings collection

    def set_selection(self, viewpoint):
-        selected_global_ids = [s.ifc_guid for s in viewpoint.components.selection]
+        if not viewpoint.visualization_info.components or not viewpoint.visualization_info.components.selection:
+            return
+        selected_global_ids = [s.ifc_guid for s in viewpoint.visualization_info.components.selection.component or []]
        bpy.ops.object.select_all(action="DESELECT")
        for global_id in selected_global_ids:
            obj = IfcStore.get_element(global_id)
@@ -941,7 +993,7 @@ class ActivateBcfViewpoint(bpy.types.Operator):

    def set_colours(self, viewpoint):
        global_id_colours = {}
-        for coloring in viewpoint.components.coloring:
+        for coloring in viewpoint.visualization_info.components.coloring or []:
            for component in coloring.components:
                global_id_colours.setdefault(component.ifc_guid, coloring.color)
        for global_id, color in global_id_colours.items():
@@ -949,14 +1001,6 @@ class ActivateBcfViewpoint(bpy.types.Operator):
            if obj:
                obj.color = self.hex_to_rgb(color)

-    def get_opening_collections(self, context):
-        collections = []
-        for collection in context.view_layer.layer_collection.children:
-            opening_collection = collection.children.get("IfcOpeningElements")
-            if opening_collection:
-                collections.append(opening_collection)
-        return collections
-
    def draw_lines(self, viewpoint, context):
        gp = bpy.data.grease_pencils.new("BCF")
        scene = context.scene
@@ -968,9 +1012,9 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        frame = layer.frames.new(1)
        stroke = frame.strokes.new()
        stroke.display_mode = "3DSPACE"
-        stroke.points.add(len(viewpoint.lines) * 2)
+        stroke.points.add(len(viewpoint.visualization_info.lines.line) * 2)
        coords = []
-        for l in viewpoint.lines:
+        for l in viewpoint.visualization_info.lines.line:
            coords.extend(
                [l.start_point.x, l.start_point.y, l.start_point.z, l.end_point.x, l.end_point.y, l.end_point.z]
            )
@@ -978,7 +1022,7 @@ class ActivateBcfViewpoint(bpy.types.Operator):

    def create_clipping_planes(self, viewpoint):
        n = 0
-        for plane in viewpoint.clipping_planes:
+        for plane in viewpoint.visualization_info.clipping_planes.clipping_plane:
            bpy.ops.bim.add_section_plane()
            if n == 0:
                obj = bpy.data.objects["Section"]
@@ -1011,10 +1055,14 @@ class ActivateBcfViewpoint(bpy.types.Operator):
        collection = bpy.data.collections.get("Bitmaps")
        if not collection:
            collection = bpy.data.collections.new("Bitmaps")
-        for bitmap in viewpoint.bitmaps:
+        for bitmap in viewpoint.visualization_info.bitmap:
            obj = bpy.data.objects.new("Bitmap", None)
            obj.empty_display_type = "IMAGE"
-            image = bpy.data.images.load(os.path.join(bcfxml.filepath, topic.guid, bitmap.reference))
+            # image = bpy.data.images.load(os.path.join(bcfxml.filepath, topic.guid, bitmap.reference))
+            with tempfile.NamedTemporaryFile(delete=False) as f:
+                topic.extract_file(bitmap, f.name)
+                # f.write(bitmap.what)
+                image = bpy.data.images.load(f.name)
            src_width = image.size[0]
            src_height = image.size[1]
            if src_height > src_width:
@@ -1053,6 +1101,7 @@ class SelectBcfHeaderFile(bpy.types.Operator):
    bl_label = "Select BCF Header File"
    bl_options = {"REGISTER", "UNDO"}
    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    filter_glob: bpy.props.StringProperty(default="*.ifc;*.ifczip;*.ifcxml;*.ifcjson", options={"HIDDEN"})

    def execute(self, context):
        if self.filepath:
@@ -1094,3 +1143,25 @@ class SelectBcfDocumentReference(bpy.types.Operator):
    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {"RUNNING_MODAL"}
+
+
+class ExtractBcfFile(bpy.types.Operator):
+    bl_idname = "bim.extract_bcf_file"
+    bl_label = "Extract BCF Header File"
+    bl_options = {"REGISTER", "UNDO"}
+    entity_type: bpy.props.StringProperty()
+    index: bpy.props.IntProperty()
+
+    def execute(self, context):
+        bcfxml = bcfstore.BcfStore.get_bcfxml()
+        topic = bcfxml.topics[context.scene.BCFProperties.active_topic.name]
+
+        if self.entity_type == "HEADER_FILE":
+            entity = topic.header.file[self.index]
+        elif self.entity_type == "BIM_SNIPPET":
+            entity = topic.markup.topic.bim_snippet
+        elif self.entity_type == "DOCUMENT_REFERENCE":
+            entity = topic.markup.topic.document_reference[self.index]
+
+        webbrowser.open(str(topic.extract_file(entity).parent))
+        return {"FINISHED"}
@@ -95,8 +95,8 @@ def getBcfViewpoints(self, context, force_update=False):
        props = context.scene.BCFProperties
        bcfxml = bcfstore.BcfStore.get_bcfxml()
        topic = props.active_topic
-        viewpoints = bcfxml.get_viewpoints(topic.name) if topic else {}
-        bcfviewpoints_enum.extend([(v, f"Viewpoint {i+1}", "") for i, v in enumerate(viewpoints.keys())])
+        viewpoints = bcfxml.topics[topic.name].viewpoints.keys() if topic else []
+        bcfviewpoints_enum.extend([(v, f"Viewpoint {i+1}", "") for i, v in enumerate(viewpoints)])
    return bcfviewpoints_enum


@@ -127,20 +127,21 @@ class BIM_PT_bcf_metadata(Panel):
        layout.label(text="Header Files:")

        if bcf_topic.header:
-            for index, f in enumerate(bcf_topic.header.files):
+            for index, f in enumerate(bcf_topic.header.file):
                box = self.layout.box()
                row = box.row(align=True)
                row.label(text=f.filename, icon="FILE_BLANK")
                if f.is_external:
                    row.operator("bim.open_uri", icon="URL", text="").uri = f.reference
                else:
-                    op = row.operator("bim.open_uri", icon="FILE_FOLDER", text="")
-                    op.uri = os.path.join(bcfxml.filepath, topic.name, f.reference)
+                    op = row.operator("bim.extract_bcf_file", icon="FILE_FOLDER", text="")
+                    op.index = index
+                    op.entity_type = "HEADER_FILE"
                row.operator("bim.remove_bcf_file", icon="X", text="").index = index

                row = box.row()
                row.label(text="Date")
-                row.label(text=f.date)
+                row.label(text=str(f.date))

                if f.ifc_project:
                    row = box.row()
@@ -196,8 +197,8 @@ class BIM_PT_bcf_metadata(Panel):
            if topic.bim_snippet.is_external:
                row.operator("bim.open_uri", icon="URL", text="").uri = topic.bim_snippet.reference
            else:
-                op = row.operator("bim.open_uri", icon="FILE_FOLDER", text="")
-                op.uri = os.path.join(bcfxml.filepath, topic.name, topic.bim_snippet.reference)
+                op = row.operator("bim.extract_bcf_file", icon="FILE_FOLDER", text="")
+                op.entity_type = "BIM_SNIPPET"
            row.operator("bim.remove_bcf_bim_snippet", icon="X", text="")
        else:
            row = layout.row(align=True)
@@ -218,8 +219,10 @@ class BIM_PT_bcf_metadata(Panel):
            if doc.is_external:
                row.operator("bim.open_uri", icon="URL", text="").uri = doc.reference
            else:
-                op = row.operator("bim.open_uri", icon="FILE_FOLDER", text="")
-                op.uri = os.path.join(bcfxml.filepath, topic.name, doc.reference)
+                op = row.operator("bim.extract_bcf_file", icon="FILE_FOLDER", text="")
+                op.entity_type = "DOCUMENT_REFERENCE"
+                op.index = index
+
            row.operator("bim.remove_bcf_document_reference", icon="X", text="").index = index
            row = box.row(align=True)
            row.prop(doc, "description")
@@ -236,7 +239,7 @@ class BIM_PT_bcf_metadata(Panel):
            try:
                row = layout.row(align=True)
                op = row.operator(
-                    "bim.view_bcf_topic", text=f"Select {bcfxml.topics[related_topic.name.lower()].title}"
+                    "bim.view_bcf_topic", text=f"Select {bcfxml.topics[related_topic.name.lower()].topic.title}"
                )
                op.topic_guid = related_topic.name
                row.operator("bim.remove_bcf_related_topic", icon="X", text="").index = index
@@ -20,18 +20,21 @@ import bpy
 from . import ui, operator, prop

 classes = (
+    operator.ColourByRelatedBuildingElement,
+    operator.DisableEditingBoundary,
+    operator.EditBoundaryAttributes,
+    operator.EnableEditingBoundary,
    operator.LoadProjectSpaceBoundaries,
    operator.LoadSpaceBoundaries,
    operator.LoadBoundary,
+    operator.SelectRelatedElementBoundaries,
    operator.SelectProjectBoundaries,
-    operator.ColourByRelatedBuildingElement,
-    operator.EnableEditingBoundary,
-    operator.DisableEditingBoundary,
-    operator.EditBoundaryAttributes,
+    operator.SelectRelatedElementTypeBoundaries,
+    operator.SelectSpaceBoundaries,
    operator.UpdateBoundaryGeometry,
    ui.BIM_PT_Boundary,
-    ui.BIM_PT_SpaceBoundaries,
    ui.BIM_PT_SceneBoundaries,
+    ui.BIM_PT_SpaceBoundaries,
    prop.BIMBoundaryProperties,
 )

@@ -0,0 +1,43 @@
+# BlenderBIM Add-on - OpenBIM Blender Add-on
+# Copyright (C) 2023 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of BlenderBIM Add-on.
+#
+# BlenderBIM Add-on is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# BlenderBIM Add-on is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+import blenderbim.tool as tool
+
+
+def refresh():
+    SpaceBoundariesData.is_loaded = False
+
+
+class SpaceBoundariesData:
+    data = {}
+    is_loaded = False
+
+    @classmethod
+    def load(cls):
+        cls.data = {"boundaries": cls.boundaries()}
+        cls.is_loaded = True
+
+    @classmethod
+    def boundaries(cls):
+        results = []
+        element = tool.Ifc.get_entity(bpy.context.active_object)
+        for rel in element.BoundedBy or []:
+            description = f"{rel.id()} > {rel.RelatedBuildingElement.is_a()}/{rel.RelatedBuildingElement.Name}"
+            results.append({"id": rel.id(), "description": description})
+        return results
@@ -17,11 +17,14 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.

 import bpy
+import bmesh
+import mathutils
 import logging
 import ifcopenshell.api
+import ifcopenshell.util.placement
+import ifcopenshell.util.unit
 import blenderbim.tool as tool
 from blenderbim.bim.ifc import IfcStore
-from ifcopenshell.api.boundary.data import Data
 import blenderbim.bim.import_ifc as import_ifc


@@ -40,8 +43,8 @@ class Loader:
        self.ifc_file = None
        self.logger = None
        self.ifc_importer = None
-        self.settings = None
-        self.load_settings()
+        self.settings = self.load_settings()
+        self.fallback_settings = self.load_fallback_settings()
        self.load_importer()

    def create_mesh(self, boundary):
@@ -49,18 +52,50 @@ class Loader:
        if not boundary.ConnectionGeometry:
            return None
        surface = boundary.ConnectionGeometry.SurfaceOnRelatingElement
-        # workaround for invalid geometry provided by Revit. See https://github.com/IfcOpenShell/IfcOpenShell/issues/635#issuecomment-770366838
+        # Workaround for invalid geometry provided by Revit. See https://github.com/Autodesk/revit-ifc/issues/270
        if surface.is_a("IfcCurveBoundedPlane") and not getattr(surface, "InnerBoundaries", None):
            surface.InnerBoundaries = ()
-        shape = ifcopenshell.geom.create_shape(self.settings, surface)
-        mesh = self.ifc_importer.create_mesh(None, shape)
-        self.ifc_importer.link_mesh(shape, mesh)
+        try:
+            shape = ifcopenshell.geom.create_shape(self.settings, surface)
+            mesh = self.ifc_importer.create_mesh(None, shape)
+            tool.Loader.link_mesh(shape, mesh)
+        except RuntimeError:
+            # Fallback solution for invalid geometry provided by Revit. (InnerBoundaries cuting OuterBoundary)
+            print(f"Failed to create mesh from IfcRelSpaceBoundary with ID {boundary.id()}. Geometry might be invalid")
+            shape = ifcopenshell.geom.create_shape(self.fallback_settings, surface.OuterBoundary)
+            mesh = bpy.data.meshes.new(str(surface.id()))
+            bm = bmesh.new()
+            verts = [bm.verts.new(shape.verts[i : i + 3]) for i in range(0, len(shape.verts), 3)]
+            bm.faces.new(verts)
+            for inner_boundary in surface.InnerBoundaries:
+                shape = ifcopenshell.geom.create_shape(self.fallback_settings, inner_boundary)
+                verts = [bm.verts.new(shape.verts[i : i + 3]) for i in range(0, len(shape.verts), 3)]
+                for i in range(len(verts) - 1):
+                    bm.edges.new(verts[i : i + 2])
+                bm.edges.new((verts[-1], verts[0]))
+            bm.to_mesh(mesh)
+            bm.free()
+            mesh.BIMMeshProperties.ifc_definition_id = surface.id()
+            unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+            matrix = mathutils.Matrix(
+                ifcopenshell.util.placement.get_axis2placement(surface.BasisSurface.Position).tolist()
+            )
+            matrix[0][3] *= unit_scale
+            matrix[1][3] *= unit_scale
+            matrix[2][3] *= unit_scale
+            mesh.transform(matrix)
        return mesh

    def load_settings(self):
-        self.settings = ifcopenshell.geom.settings()
-        self.settings.set(self.settings.EXCLUDE_SOLIDS_AND_SURFACES, False)
-        self.settings.set(self.settings.USE_BREP_DATA, False)
+        settings = ifcopenshell.geom.settings()
+        settings.set(settings.EXCLUDE_SOLIDS_AND_SURFACES, False)
+        settings.set(settings.USE_BREP_DATA, False)
+        return settings
+
+    def load_fallback_settings(self):
+        settings = ifcopenshell.geom.settings()
+        settings.set(settings.INCLUDE_CURVES, True)
+        return settings

    def load_importer(self):
        self.ifc_file = tool.Ifc.get()
@@ -69,8 +104,7 @@ class Loader:
        self.ifc_importer = import_ifc.IfcImporter(ifc_import_settings)
        self.ifc_importer.file = self.ifc_file

-    def load_boundary(self, boundary_id, blender_space):
-        boundary = self.ifc_file.by_id(boundary_id)
+    def load_boundary(self, boundary, blender_space):
        obj = tool.Ifc.get_object(boundary)
        if obj:
            return obj
@@ -90,12 +124,8 @@ class LoadProjectSpaceBoundaries(bpy.types.Operator):

    def execute(self, context):
        loader = Loader()
-        if not Data.is_loaded:
-            Data.load(tool.Ifc.get())
-        for space_id, boundaries_id in Data.spaces.items():
-            blender_space = tool.Ifc.get_object(tool.Ifc.get().by_id(space_id))
-            for boundary_id in boundaries_id:
-                loader.load_boundary(boundary_id, blender_space)
+        for rel in tool.Ifc.get().by_type("IfcRelSpaceBoundary"):
+            loader.load_boundary(rel, tool.Ifc.get_object(rel.RelatingSpace))
        return {"FINISHED"}


@@ -107,10 +137,9 @@ class LoadBoundary(bpy.types.Operator):

    def execute(self, context):
        loader = Loader()
-        blender_space = context.active_object
        for obj in context.visible_objects:
            obj.select_set(False)
-        obj = loader.load_boundary(self.boundary_id, blender_space)
+        obj = loader.load_boundary(tool.Ifc.get().by_id(self.boundary_id), context.active_object)
        obj.select_set(True)
        bpy.context.view_layer.objects.active = obj
        return {"FINISHED"}
@@ -122,13 +151,74 @@ class LoadSpaceBoundaries(bpy.types.Operator):
    bl_options = {"REGISTER", "UNDO"}

    def execute(self, context):
-        blender_space = context.active_object
-        oprops = context.active_object.BIMObjectProperties
        loader = Loader()
-        if not Data.is_loaded:
-            Data.load(tool.Ifc.get())
-        for boundary_id in Data.spaces.get(oprops.ifc_definition_id, []):
-            loader.load_boundary(boundary_id, blender_space)
+        element = tool.Ifc.get_entity(context.active_object)
+        for rel in element.BoundedBy or []:
+            loader.load_boundary(rel, context.active_object)
+        return {"FINISHED"}
+
+
+def get_element_boundaries(element):
+    if not element:
+        return ()
+    if element.is_a("IfcSpace"):
+        return (b for b in element.BoundedBy or ())
+    return (b for b in element.ProvidesBoundaries)
+
+
+class SelectRelatedElementBoundaries(bpy.types.Operator):
+    bl_idname = "bim.select_related_element_boundaries"
+    bl_label = "Select related element space boundaries"
+    bl_options = {"REGISTER", "UNDO"}
+    related_element: bpy.props.IntProperty()
+
+    def execute(self, context):
+        for obj in context.visible_objects:
+            obj.select_set(False)
+        element = tool.Ifc.get().by_id(self.related_element)
+        for rel in get_element_boundaries(element):
+            obj = tool.Ifc.get_object(rel)
+            if obj:
+                obj.select_set(True)
+        return {"FINISHED"}
+
+
+class SelectRelatedElementTypeBoundaries(bpy.types.Operator):
+    bl_idname = "bim.select_related_element_type_boundaries"
+    bl_label = "Select related element type space boundaries"
+    bl_options = {"REGISTER", "UNDO"}
+    related_element: bpy.props.IntProperty()
+
+    def execute(self, context):
+        for obj in context.visible_objects:
+            obj.select_set(False)
+        element = tool.Ifc.get().by_id(self.related_element)
+        if not element:
+            return {"FINISHED"}
+        element_type = tool.Root.get_element_type(element)
+        if not element_type:
+            return {"FINISHED"}
+        for child in tool.Type.get_type_occurrences(element_type):
+            for rel in get_element_boundaries(child):
+                obj = tool.Ifc.get_object(rel)
+                if obj:
+                    obj.select_set(True)
+        return {"FINISHED"}
+
+
+class SelectSpaceBoundaries(bpy.types.Operator):
+    bl_idname = "bim.select_space_boundaries"
+    bl_label = "Select all space boundaries"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        for obj in context.visible_objects:
+            obj.select_set(False)
+        element = tool.Ifc.get_entity(context.active_object)
+        for rel in element.BoundedBy or []:
+            obj = tool.Ifc.get_object(rel)
+            if obj:
+                obj.select_set(True)
        return {"FINISHED"}


@@ -140,10 +230,8 @@ class SelectProjectBoundaries(bpy.types.Operator):
    def execute(self, context):
        for obj in context.visible_objects:
            obj.select_set(False)
-        ifc_file = tool.Ifc.get()
-        for boundary_id in Data.boundaries:
-            boundary = ifc_file.by_id(boundary_id)
-            obj = tool.Ifc.get_object(boundary)
+        for rel in tool.Ifc.get().by_type("IfcRelSpaceBoundary"):
+            obj = tool.Ifc.get_object(rel)
            if obj:
                obj.select_set(True)
        return {"FINISHED"}
@@ -184,11 +272,10 @@ class ColourByRelatedBuildingElement(bpy.types.Operator):
        return result

    def _execute(self, context):
-        self.file = tool.Ifc.get()
        for obj in context.visible_objects:
            if not obj.BIMObjectProperties.ifc_definition_id:
                continue
-            element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
+            element = tool.Ifc.get_entity(obj)
            if not element.is_a("IfcRelSpaceBoundary"):
                continue
            obj.color = get_colour(element)
@@ -285,6 +372,7 @@ class UpdateBoundaryGeometry(bpy.types.Operator):
        return IfcStore.execute_ifc_operator(self, context)

    def _execute(self, context):
+        tool.Boundary.move_origin_to_space_origin(context.active_object)
        settings = tool.Boundary.get_assign_connection_geometry_settings(context.active_object)
        ifcopenshell.api.run("boundary.assign_connection_geometry", tool.Ifc.get(), **settings)
        return {"FINISHED"}
@@ -21,7 +21,7 @@ import blenderbim.bim.helper
 from bpy.types import Panel, UIList
 from blenderbim.bim.ifc import IfcStore
 import blenderbim.tool as tool
-from ifcopenshell.api.boundary.data import Data
+from blenderbim.bim.module.boundary.data import SpaceBoundariesData


 class BIM_PT_SceneBoundaries(Panel):
@@ -67,7 +67,6 @@ class BIM_PT_Boundary(Panel):
    def draw(self, context):
        props = context.active_object.BIMObjectProperties
        ifc_file = tool.Ifc.get()
-        element = ifc_file.by_id(props.ifc_definition_id)
        boundary = ifc_file.by_id(props.ifc_definition_id)
        self.bprops = context.active_object.bim_boundary_properties
        if self.bprops.is_editing:
@@ -103,6 +102,11 @@ class BIM_PT_Boundary(Panel):
                row.label(text=f"{entity.is_a()}/{entity.Name}")
                op = row.operator("bim.select_global_id", text="", icon="OBJECT_DATA")
                op.global_id = entity.GlobalId
+                if ifc_attribute in ("RelatingSpace", "RelatedBuildingElement"):
+                    op = row.operator("bim.select_related_element_boundaries", text="", icon="RESTRICT_SELECT_OFF")
+                    op.related_element = entity.id()
+                    op = row.operator("bim.select_related_element_type_boundaries", text="", icon="ASSET_MANAGER")
+                    op.related_element = entity.id()
            else:
                row.label(text="")

@@ -130,28 +134,23 @@ class BIM_PT_SpaceBoundaries(Panel):
            return False
        if not IfcStore.get_element(props.ifc_definition_id):
            return False
-        valid_classes = ("IfcSpace", "IfcExternalSpatialElement")
-        entity = IfcStore.get_file().by_id(props.ifc_definition_id)
-        for ifc_class in valid_classes:
-            if entity.is_a(ifc_class):
+        element = tool.Ifc.get_entity(context.active_object)
+        for ifc_class in ("IfcSpace", "IfcExternalSpatialElement"):
+            if element.is_a(ifc_class):
                return True
        return False

    def draw(self, context):
+        if not SpaceBoundariesData.is_loaded:
+            SpaceBoundariesData.load()
+
        self.props = context.active_object.BIMObjectProperties
        self.ifc_file = tool.Ifc.get()
        row = self.layout.row()
        row.operator("bim.load_space_boundaries")
-        if not Data.is_loaded:
-            Data.load(self.ifc_file)
-        for boundary_id in Data.spaces.get(self.props.ifc_definition_id, []):
-            boundary_data = Data.boundaries[boundary_id]
-            building_element = self.ifc_file.by_id(boundary_data["RelatedBuildingElement"])
+        row.operator("bim.select_space_boundaries", text="", icon="RESTRICT_SELECT_OFF")
+        for boundary in SpaceBoundariesData.data["boundaries"]:
            row = self.layout.row()
-            if building_element:
-                bld_el_description = f"{building_element.is_a()}/{building_element.Name}"
-            else:
-                bld_el_description = None
-            row.label(text=f"{boundary_id} > {bld_el_description}", icon="GHOST_ENABLED")
+            row.label(text=boundary["description"], icon="GHOST_ENABLED")
            op = row.operator("bim.load_boundary", text="", icon="RESTRICT_SELECT_OFF")
-            op.boundary_id = boundary_id
+            op.boundary_id = boundary["id"]
@@ -51,7 +51,6 @@ class BIM_PT_brickschema(Panel):
        row = self.layout.row(align=True)
        prop_with_search(row, self.props, "namespace", text="")
        prop_with_search(row, self.props, "brick_equipment_class", text="")
-        row.prop(self.props, "brick_equipment_class", text="")
        row.operator("bim.add_brick", text="", icon="ADD")

        row = self.layout.row(align=True)
@@ -18,6 +18,7 @@

 import os
 import bpy
+import blenderbim.tool as tool
 import blenderbim.bim.module.type.prop as type_prop
 from bpy.types import WorkSpaceTool
 from blenderbim.bim.module.model.data import AuthoringData
@@ -51,9 +52,14 @@ class CadTool(WorkSpaceTool):
            row = layout.row(align=True)
            row.label(text="", icon="EVENT_SHIFT")
            row.label(text="", icon="EVENT_Q")
-            row.operator("bim.edit_extrusion_profile", text="Save Profile")
-            row.operator("bim.align_view_to_profile", text="", icon="AXIS_FRONT")
-            row.operator("bim.disable_editing_extrusion_profile", text="", icon="CANCEL")
+            if obj.BIMObjectProperties.ifc_definition_id:
+                row.operator("bim.edit_extrusion_profile", text="Save Profile")
+                row.operator("bim.align_view_to_profile", text="", icon="AXIS_FRONT")
+                row.operator("bim.disable_editing_extrusion_profile", text="", icon="CANCEL")
+            else:
+                row.operator("bim.edit_arbitrary_profile", text="Save Profile")
+                row.operator("bim.align_view_to_profile", text="", icon="AXIS_FRONT")
+                row.operator("bim.disable_editing_arbitrary_profile", text="", icon="CANCEL")

            row = layout.row(align=True)
            row.label(text="", icon="EVENT_SHIFT")
@@ -180,7 +186,10 @@ class CadHotkey(bpy.types.Operator):
        bpy.ops.bim.cad_offset(distance=self.props.distance)

    def hotkey_S_Q(self):
-        bpy.ops.bim.edit_extrusion_profile()
+        if tool.Ifc.get_entity(bpy.context.active_object):
+            bpy.ops.bim.edit_extrusion_profile()
+        else:
+            bpy.ops.bim.edit_arbitrary_profile()

    def hotkey_S_R(self):
        if self.is_profile():
@@ -22,6 +22,7 @@ import json
 import bmesh
 import logging
 import numpy as np
+import ifcopenshell
 from mathutils import Matrix
 from math import radians
 from blenderbim.bim.ifc import IfcStore
@@ -32,6 +33,7 @@ class ExportClashSets(bpy.types.Operator):
    bl_label = "Export Clash Sets"
    filename_ext = ".json"
    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    filter_glob: bpy.props.StringProperty(default="*.json", options={"HIDDEN"})

    def invoke(self, context, event):
        self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".json")
@@ -64,6 +66,7 @@ class ImportClashSets(bpy.types.Operator):
    bl_options = {"REGISTER", "UNDO"}
    filename_ext = ".json"
    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    filter_glob: bpy.props.StringProperty(default="*.json", options={"HIDDEN"})

    def invoke(self, context, event):
        self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".json")
@@ -194,11 +197,12 @@ class SelectSmartGroupedClashesPath(bpy.types.Operator):
 class ExecuteIfcClash(bpy.types.Operator):
    bl_idname = "bim.execute_ifc_clash"
    bl_label = "Execute IFC Clash"
-    filename_ext = ".bcf"
+    filter_glob: bpy.props.StringProperty(default="*.bcf;*.json", options={"HIDDEN"})
    filepath: bpy.props.StringProperty(subtype="FILE_PATH")

    def invoke(self, context, event):
-        if ".json" not in bpy.data.filepath:
+        _, extension = os.path.splitext(self.filepath)
+        if extension != ".json":
            self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".bcf")
        WindowManager = context.window_manager
        WindowManager.fileselect_add(self)
@@ -207,9 +211,10 @@ class ExecuteIfcClash(bpy.types.Operator):
    def execute(self, context):
        from ifcclash import ifcclash

-        settings = ifcclash.ClashSettings()
-        if ".json" not in self.filepath:
+        _, extension = os.path.splitext(self.filepath)
+        if extension != ".json":
            self.filepath = bpy.path.ensure_ext(self.filepath, ".bcf")
+        settings = ifcclash.ClashSettings()
        settings.output = self.filepath
        settings.logger = logging.getLogger("Clash")
        settings.logger.setLevel(logging.DEBUG)
@@ -271,6 +276,7 @@ class SelectIfcClashResults(bpy.types.Operator):
        return {"RUNNING_MODAL"}

    def execute(self, context):
+        self.file = IfcStore.get_file()
        self.filepath = bpy.path.ensure_ext(self.filepath, ".json")
        with open(self.filepath) as f:
            clash_sets = json.load(f)
@@ -284,10 +290,25 @@ class SelectIfcClashResults(bpy.types.Operator):
                return {"CANCELLED"}
            for clash in clash_set["clashes"].values():
                global_ids.extend([clash["a_global_id"], clash["b_global_id"]])
+
        for obj in context.visible_objects:
            if not obj.BIMObjectProperties.ifc_definition_id:
                continue
-            element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
+
+            ifc_file = ""
+            for scene in obj.users_scene:
+                if scene.BIMProperties.ifc_file:
+                    ifc_file = scene.BIMProperties.ifc_file
+                    break
+
+            if ifc_file:
+                if ifc_file not in IfcStore.session_files:
+                    IfcStore.session_files[ifc_file] = ifcopenshell.open(ifc_file)
+                element_file = IfcStore.session_files[ifc_file]
+            else:
+                element_file = self.file
+
+            element = element_file.by_id(obj.BIMObjectProperties.ifc_definition_id)
            if element.GlobalId in global_ids:
                obj.select_set(True)
        return {"FINISHED"}
@@ -304,14 +325,14 @@ class SmartClashGroup(bpy.types.Operator):
        return context.scene.BIMClashProperties.clash_results_path

    def execute(self, context):
-        import ifcclash
+        from ifcclash import ifcclash

-        settings = ifcclash.IfcClashSettings()
+        settings = ifcclash.ClashSettings()
        self.filepath = bpy.path.ensure_ext(context.scene.BIMClashProperties.clash_results_path, ".json")
        settings.output = self.filepath
        settings.logger = logging.getLogger("Clash")
        settings.logger.setLevel(logging.DEBUG)
-        ifc_clasher = ifcclash.IfcClasher(settings)
+        ifc_clasher = ifcclash.Clasher(settings)

        with open(self.filepath) as f:
            clash_sets = json.load(f)
@@ -65,12 +65,13 @@ class ClassificationsData:

 class ReferencesData:
    @classmethod
-    def is_available_classification_added(cls):
+    def active_classification_library(cls):
        if not IfcStore.classification_file or not IfcStore.classification_file.by_type("IfcClassification"):
            return False
        props = bpy.context.scene.BIMClassificationProperties
        name = IfcStore.classification_file.by_id(int(props.available_classifications)).Name
-        return name in [e.Name for e in tool.Ifc.get().by_type("IfcClassification")]
+        if name in [e.Name for e in tool.Ifc.get().by_type("IfcClassification")]:
+            return name


 class ClassificationReferencesData(ReferencesData):
@@ -81,7 +82,7 @@ class ClassificationReferencesData(ReferencesData):
    def load(cls):
        cls.is_loaded = True
        cls.data["references"] = cls.references()
-        cls.data["is_available_classification_added"] = cls.is_available_classification_added()
+        cls.data["active_classification_library"] = cls.active_classification_library()

    @classmethod
    def references(cls):
@@ -103,7 +104,7 @@ class MaterialClassificationsData(ReferencesData):
    def load(cls):
        cls.is_loaded = True
        cls.data["references"] = cls.references()
-        cls.data["is_available_classification_added"] = cls.is_available_classification_added()
+        cls.data["active_classification_library"] = cls.active_classification_library()

    @classmethod
    def references(cls):
@@ -125,7 +126,7 @@ class CostClassificationsData(ReferencesData):
    def load(cls):
        cls.is_loaded = True
        cls.data["references"] = cls.references()
-        cls.data["is_available_classification_added"] = cls.is_available_classification_added()
+        cls.data["active_classification_library"] = cls.active_classification_library()

    @classmethod
    def references(cls):
@@ -100,12 +100,16 @@ class ReferenceUI:
                self.draw_reference_ui(reference)

    def draw_add_ui(self, context):
-        if not self.data.data["is_available_classification_added"]:
+        if not self.data.data["active_classification_library"]:
+            row = self.layout.row(align=True)
+            row.label(text="No Active Classification Library")
+            row.operator("bim.load_classification_library", text="", icon="IMPORT")
            return
        row = self.layout.row(align=True)
-        row.prop(self.sprops, "available_classifications", text="")
+        row.label(text=f"Active Classification Library: {self.data.data['active_classification_library']}")
+        #row.prop(self.sprops, "available_classifications", text="")
        if not self.sprops.available_library_references:
-            op = row.operator("bim.change_classification_level", text="", icon="IMPORT")
+            op = row.operator("bim.change_classification_level", text="", icon="GREASEPENCIL")
            op.parent_id = int(self.sprops.available_classifications)
            return
        if self.sprops.active_library_referenced_source:
@@ -0,0 +1,59 @@
+# BlenderBIM Add-on - OpenBIM Blender Add-on
+# Copyright (C) 2023 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of BlenderBIM Add-on.
+#
+# BlenderBIM Add-on is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# BlenderBIM Add-on is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+import blenderbim.tool as tool
+
+
+def refresh():
+    ConstraintsData.is_loaded = False
+    ObjectConstraintsData.is_loaded = False
+
+
+class ConstraintsData:
+    data = {}
+    is_loaded = False
+
+    @classmethod
+    def load(cls):
+        cls.data = {"total_objectives": cls.total_objectives()}
+        cls.is_loaded = True
+
+    @classmethod
+    def total_objectives(cls):
+        return len(tool.Ifc.get().by_type("IfcObjective"))
+
+
+class ObjectConstraintsData:
+    data = {}
+    is_loaded = False
+
+    @classmethod
+    def load(cls):
+        cls.data = {"constraints": cls.constraints()}
+        cls.is_loaded = True
+
+    @classmethod
+    def constraints(cls):
+        results = []
+        element = tool.Ifc.get_entity(bpy.context.active_object)
+        for rel in element.HasAssociations or []:
+            if rel.is_a("IfcRelAssociatesConstraint"):
+                constraint = rel.RelatingConstraint
+                results.append({"id": constraint.id(), "type": constraint.is_a(), "name": constraint.Name or "Unnamed"})
+        return results
@@ -21,8 +21,8 @@ import json
 import ifcopenshell.api
 import ifcopenshell.util.attribute
 import blenderbim.bim.helper
+import blenderbim.tool as tool
 from blenderbim.bim.ifc import IfcStore
-from ifcopenshell.api.constraint.data import Data


 class LoadObjectives(bpy.types.Operator):
@@ -33,10 +33,10 @@ class LoadObjectives(bpy.types.Operator):
    def execute(self, context):
        props = context.scene.BIMConstraintProperties
        props.constraints.clear()
-        for constraint_id, constraint in Data.objectives.items():
+        for constraint in tool.Ifc.get().by_type("IfcObjective"):
            new = props.constraints.add()
-            new.name = constraint["Name"] or "Unnamed"
-            new.ifc_definition_id = constraint_id
+            new.name = constraint.Name or "Unnamed"
+            new.ifc_definition_id = constraint.id()
        props.is_editing = "IfcObjective"
        bpy.ops.bim.disable_editing_constraint()
        return {"FINISHED"}
@@ -62,11 +62,7 @@ class EnableEditingConstraint(bpy.types.Operator):
    def execute(self, context):
        props = context.scene.BIMConstraintProperties
        props.constraint_attributes.clear()
-
-        if props.is_editing == "IfcObjective":
-            data = Data.objectives[self.constraint]
-
-        blenderbim.bim.helper.import_attributes(props.is_editing, props.constraint_attributes, data)
+        blenderbim.bim.helper.import_attributes2(tool.Ifc.get().by_id(self.constraint), props.constraint_attributes)
        props.active_constraint_id = self.constraint
        return {"FINISHED"}

@@ -91,7 +87,6 @@ class AddObjective(bpy.types.Operator):

    def _execute(self, context):
        result = ifcopenshell.api.run("constraint.add_objective", IfcStore.get_file())
-        Data.load(IfcStore.get_file())
        bpy.ops.bim.load_objectives()
        bpy.ops.bim.enable_editing_constraint(constraint=result.id())
        return {"FINISHED"}
@@ -121,7 +116,6 @@ class EditObjective(bpy.types.Operator):
            self.file,
            **{"objective": self.file.by_id(props.active_constraint_id), "attributes": attributes}
        )
-        Data.load(IfcStore.get_file())
        bpy.ops.bim.load_objectives()
        return {"FINISHED"}

@@ -141,7 +135,6 @@ class RemoveConstraint(bpy.types.Operator):
        ifcopenshell.api.run(
            "constraint.remove_constraint", self.file, **{"constraint": self.file.by_id(self.constraint)}
        )
-        Data.load(IfcStore.get_file())
        if props.is_editing == "IfcObjective":
            bpy.ops.bim.load_objectives()
        return {"FINISHED"}
@@ -200,7 +193,6 @@ class AssignConstraint(bpy.types.Operator):
                    "constraint": self.file.by_id(self.constraint),
                }
            )
-            Data.load(self.file, obj_id)
        return {"FINISHED"}


@@ -229,5 +221,4 @@ class UnassignConstraint(bpy.types.Operator):
                    "constraint": self.file.by_id(self.constraint),
                }
            )
-            Data.load(self.file, obj_id)
        return {"FINISHED"}
--- a/Show More
+++ b/Show More