You can now modify project context declarations for project libraries, denoting which assets are part of the library

src/blenderbim/blenderbim/bim/export_ifc.py

@@ -129,7 +129,10 @@ class IfcExporter:
         element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
         element_collection = bpy.data.collections.get(obj.name)
 
-        if element.is_a("IfcProject"):
+        if self.file.schema == "IFC2X3":
+            if element.is_a("IfcProject"):
+                return
+        elif element.is_a("IfcContext"):
             return
 
         if (element.is_a("IfcElement") and element_collection) or element.is_a("IfcSpatialStructureElement"):

src/blenderbim/blenderbim/bim/module/project/__init__.py

@@ -9,6 +9,9 @@ classes = (
     operator.ChangeLibraryElement,
     operator.RefreshLibrary,
     operator.RewindLibrary,
+    operator.AssignLibraryDeclaration,
+    operator.UnassignLibraryDeclaration,
+    operator.SaveLibraryFile,
     prop.LibraryElement,
     prop.BIMProjectProperties,
     ui.BIM_PT_project,

src/blenderbim/blenderbim/bim/module/project/operator.py

@@ -5,8 +5,6 @@ import ifcopenshell.api
 import bpy
 from blenderbim.bim.ifc import IfcStore
 
-# from ifcopenshell.api.project.data import Data
-
 
 class CreateProject(bpy.types.Operator):
     bl_idname = "bim.create_project"
@@ -149,6 +147,10 @@ class ChangeLibraryElement(bpy.types.Operator):
                 new = self.props.library_elements.add()
                 new.name = element.Name or "Unnamed"
                 new.ifc_definition_id = element.id()
+                if IfcStore.library_file.schema == "IFC2X3" or not IfcStore.library_file.by_type("IfcProjectLibrary"):
+                    new.is_declared = False
+                elif element.HasContext and element.HasContext[0].RelatingContext.is_a("IfcProjectLibrary"):
+                    new.is_declared = True
         else:
             for ifc_class in ifc_classes:
                 new = self.props.library_elements.add()
@@ -169,5 +171,52 @@ class RewindLibrary(bpy.types.Operator):
         element_name = self.props.library_breadcrumb[total_breadcrumbs - 2].name
         self.props.library_breadcrumb.remove(total_breadcrumbs - 1)
         self.props.library_breadcrumb.remove(total_breadcrumbs - 2)
+        bpy.ops.bim.change_library_element(element_name=element_name)
+        return {"FINISHED"}
+
+
+class AssignLibraryDeclaration(bpy.types.Operator):
+    bl_idname = "bim.assign_library_declaration"
+    bl_label = "Assign Library Declaration"
+    definition: bpy.props.IntProperty()
+
+    def execute(self, context):
+        self.props = context.scene.BIMProjectProperties
+        ifcopenshell.api.run(
+            "project.assign_declaration",
+            IfcStore.library_file,
+            definition=IfcStore.library_file.by_id(self.definition),
+            relating_context=IfcStore.library_file.by_type("IfcProjectLibrary")[0],
+        )
+        element_name = self.props.active_library_element
+        bpy.ops.bim.rewind_library()
         bpy.ops.bim.change_library_element(element_name = element_name)
         return {"FINISHED"}
+
+
+class UnassignLibraryDeclaration(bpy.types.Operator):
+    bl_idname = "bim.unassign_library_declaration"
+    bl_label = "Unassign Library Declaration"
+    definition: bpy.props.IntProperty()
+
+    def execute(self, context):
+        self.props = context.scene.BIMProjectProperties
+        ifcopenshell.api.run(
+            "project.unassign_declaration",
+            IfcStore.library_file,
+            definition=IfcStore.library_file.by_id(self.definition),
+            relating_context=IfcStore.library_file.by_type("IfcProjectLibrary")[0],
+        )
+        element_name = self.props.active_library_element
+        bpy.ops.bim.rewind_library()
+        bpy.ops.bim.change_library_element(element_name = element_name)
+        return {"FINISHED"}
+
+
+class SaveLibraryFile(bpy.types.Operator):
+    bl_idname = "bim.save_library_file"
+    bl_label = "Save Library File"
+
+    def execute(self, context):
+        IfcStore.library_file.write(IfcStore.library_path)
+        return {"FINISHED"}

src/blenderbim/blenderbim/bim/module/project/prop.py

@@ -16,6 +16,7 @@ from bpy.props import (
 class LibraryElement(PropertyGroup):
     name: StringProperty(name="Name")
     ifc_definition_id: IntProperty(name="IFC Definition ID")
+    is_declared: BoolProperty(name="Is Declared", default=False)
 
 
 class BIMProjectProperties(PropertyGroup):

src/blenderbim/blenderbim/bim/module/project/ui.py

@@ -81,6 +81,9 @@ class BIM_PT_project_library(Panel):
         self.props = context.scene.BIMProjectProperties
         row = self.layout.row(align=True)
         row.label(text=IfcStore.library_path or "No Library Loaded", icon="ASSET_MANAGER")
+        if IfcStore.library_file:
+            row.label(text=IfcStore.library_file.schema)
+            row.operator("bim.save_library_file", text="", icon="EXPORT")
         row.operator("bim.select_library_file", icon="FILE_FOLDER", text="")
         if IfcStore.library_file:
             self.draw_library_ul()
@@ -113,3 +116,15 @@ class BIM_UL_library(UIList):
                 op = row.operator("bim.change_library_element", text="", icon="DISCLOSURE_TRI_RIGHT", emboss=False)
                 op.element_name = item.name
             row.label(text=item.name)
+            if (
+                not item.ifc_definition_id
+                or IfcStore.library_file.schema == "IFC2X3"
+                or not IfcStore.library_file.by_type("IfcProjectLibrary")
+            ):
+                return
+            if item.is_declared:
+                op = row.operator("bim.unassign_library_declaration", text="", icon="KEYFRAME_HLT", emboss=False)
+                op.definition = item.ifc_definition_id
+            else:
+                op = row.operator("bim.assign_library_declaration", text="", icon="KEYFRAME", emboss=False)
+                op.definition = item.ifc_definition_id