Classification trees are now stored in the blend instead of an external file for portability. See #1036.

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -185,7 +185,6 @@ if bpy is not None:
         operator.SaveDrawingStyle,
         operator.ActivateDrawingStyle,
         operator.EditVectorStyle,
-        operator.PurgeProjectClassifications,
         operator.RemoveSheet,
         operator.AddSchedule,
         operator.RemoveSchedule,

src/ifcblenderexport/blenderbim/bim/export_ifc.py

@@ -630,22 +630,23 @@ class IfcParser():
     def get_classifications(self):
         results = {}
         for classification in bpy.context.scene.BIMProperties.classifications:
-            schema.ifc.load_classification(classification.filename)
+            if classification.name not in schema.ifc.classification_files:
-            results[classification.filename] = {
+                schema.ifc.classification_files[classification.name] = ifcopenshell.file.from_string(classification.data)
+            results[classification.name] = {
                 'ifc': None,
                 'raw': classification,
-                'raw_element': schema.ifc.classification_files[classification.filename].by_type('IfcClassification')[0]
+                'raw_element': schema.ifc.classification_files[classification.name].by_type('IfcClassification')[0]
             }
         return results
 
     def get_classification_reference_maps(self):
         results = {}
-        for filename, classification in self.classifications.items():
+        for name, classification in self.classifications.items():
-            ifc_file = schema.ifc.classification_files[filename]
+            ifc_file = schema.ifc.classification_files[name]
             if ifc_file.schema == 'IFC2X3':
-                results[filename] = { e.ItemReference: e for e in ifc_file.by_type('IfcClassificationReference')}
+                results[name] = { e.ItemReference: e for e in ifc_file.by_type('IfcClassificationReference')}
             else:
-                results[filename] = { e.Identification: e for e in ifc_file.by_type('IfcClassificationReference')}
+                results[name] = { e.Identification: e for e in ifc_file.by_type('IfcClassificationReference')}
         return results
 
     def get_classification_references(self):

src/ifcblenderexport/blenderbim/bim/import_ifc.py

@@ -1501,13 +1501,8 @@ class IfcImporter():
                 for entity in entities_to_add:
                     classification_file.add(entity)
 
-            classification_filename = '{}-{}'.format(
+            classification.data = classification_file.to_string()
-                Path(os.path.basename(self.ifc_import_settings.input_file)).stem, element.Name)
+            self.classifications[classification.name] = classification
-            classification_file.write(os.path.join(
-                bpy.context.scene.BIMProperties.schema_dir, 'project_classifications',
-                '{}.ifc'.format(classification_filename)))
-            classification.filename = classification_filename
-            self.classifications[classification.filename] = classification
 
         self.schema_dir = bpy.context.scene.BIMProperties.schema_dir
         from . import prop
@@ -1815,9 +1810,6 @@ class IfcImporter():
     def get_referenced_source_name(self, element):
         if not hasattr(element, 'ReferencedSource') or not element.ReferencedSource:
             if element.is_a('IfcClassification'):
-                for filename, classification in self.classifications.items():
-                    if classification.name == element.Name:
-                        return filename
                 return element.Name
             else:
                 return element.Identification

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1922,11 +1922,18 @@ class ExplodeAggregate(bpy.types.Operator):
 class LoadClassification(bpy.types.Operator):
     bl_idname = 'bim.load_classification'
     bl_label = 'Load Classification'
+    is_file: bpy.props.BoolProperty()
+    classification_index: bpy.props.IntProperty()
 
     def execute(self, context):
         from . import prop
-        prop.ClassificationView.raw_data = schema.ifc.load_classification(
+        if self.is_file:
-            context.scene.BIMProperties.classification)
+            prop.ClassificationView.raw_data = schema.ifc.load_classification(
+                context.scene.BIMProperties.classification)
+        else:
+            prop.ClassificationView.raw_data = schema.ifc.load_classification(
+                context.scene.BIMProperties.classifications[self.classification_index].name,
+                self.classification_index)
         context.scene.BIMProperties.classification_references.root = ''
         return {'FINISHED'}
 
@@ -1949,7 +1956,7 @@ class AddClassification(bpy.types.Operator):
         for key, value in data_map.items():
             if hasattr(data, value) and getattr(data, value):
                 setattr(classification, key, str(getattr(data, value)))
-        classification.filename = context.scene.BIMProperties.classification
+        classification.data = schema.ifc.classification_files[context.scene.BIMProperties.classification].to_string()
         return {'FINISHED'}
 
 
@@ -1979,7 +1986,7 @@ class AssignClassification(bpy.types.Operator):
             for key in ['location', 'description']:
                 if data[key]:
                     setattr(classification, key, data[key])
-            classification.referenced_source = bpy.context.scene.BIMProperties.classification
+            classification.referenced_source = bpy.context.scene.BIMProperties.active_classification_name
         return {'FINISHED'}
 
 
@@ -3872,22 +3879,6 @@ class EditVectorStyle(bpy.types.Operator):
         return {'FINISHED'}
 
 
-class PurgeProjectClassifications(bpy.types.Operator):
-    bl_idname = 'bim.purge_project_classifications'
-    bl_label = 'Purge Project Classifications'
-
-    def execute(self, context):
-        self.schema_dir = bpy.context.scene.BIMProperties.schema_dir
-        path = os.path.join(self.schema_dir, 'project_classifications')
-        files = os.listdir(path)
-        for f in files:
-            os.remove(os.path.join(path, f))
-        from . import prop
-        prop.classification_enum.clear()
-        prop.getClassifications(self, context)
-        return {'FINISHED'}
-
-
 class RemoveSheet(bpy.types.Operator):
     bl_idname = 'bim.remove_sheet'
     bl_label = 'Remove Sheet'

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -395,8 +395,6 @@ def getClassifications(self, context):
         classification_enum.clear()
         files = os.listdir(os.path.join(self.schema_dir, 'classifications'))
         classification_enum.extend([(f.replace('.ifc', ''), f.replace('.ifc', ''), '') for f in files])
-        files = os.listdir(os.path.join(self.schema_dir, 'project_classifications'))
-        classification_enum.extend([(f.replace('.ifc', ''), f.replace('.ifc', ''), '') for f in files])
     return classification_enum
 
 
@@ -1112,7 +1110,7 @@ class Classification(PropertyGroup):
     description: StringProperty(name="Description")
     location: StringProperty(name="Location")
     reference_tokens: StringProperty(name="Reference Tokens")
-    filename: StringProperty(name="Filename")
+    data: StringProperty(name="Data")
 
 
 class ClassificationReference(PropertyGroup):
@@ -1249,6 +1247,7 @@ class BIMProperties(PropertyGroup):
     aggregate_class: EnumProperty(items=getIfcClasses, name="Aggregate Class")
     aggregate_name: StringProperty(name="Aggregate Name")
     classification: EnumProperty(items=getClassifications, name="Classification", update=refreshReferences)
+    active_classification_name: StringProperty(name="Active Classification Name")
     classifications: CollectionProperty(name="Classifications", type=Classification)
     has_model_context: BoolProperty(name="Has Model Context", default=True)
     has_plan_context: BoolProperty(name="Has Plan Context", default=True)

src/ifcblenderexport/blenderbim/bim/schema.py

@@ -62,14 +62,17 @@ class IfcSchema():
                     entity = prop.ApplicableEntity if prop.ApplicableEntity else 'IfcRoot'
                     self.applicable_psets.setdefault(entity, []).append(prop.Name)
 
-    def load_classification(self, filename):
+    def load_classification(self, name, classification_index=None):
-        if filename not in self.classifications:
+        if name not in self.classifications:
-            classification_path = os.path.join(self.schema_dir, 'classifications', '{}.ifc'.format(filename))
+            if classification_index is not None:
-            if not os.path.isfile(classification_path):
+                self.classification_files[name] = ifcopenshell.file.from_string(
-                classification_path = os.path.join(self.schema_dir, 'project_classifications', '{}.ifc'.format(filename))
+                    bpy.context.scene.BIMProperties.classifications[classification_index].data)
-            self.classification_files[filename] = ifcopenshell.open(classification_path)
+            else:
-            self.classifications[filename] = self.classification_files[filename].by_type('IfcClassification')[0]
+                classification_path = os.path.join(self.schema_dir, 'classifications', '{}.ifc'.format(name))
-        classification = self.classifications[filename]
+                self.classification_files[name] = ifcopenshell.open(classification_path)
+            self.classifications[name] = self.classification_files[name].by_type('IfcClassification')[0]
+        classification = self.classifications[name]
+        bpy.context.scene.BIMProperties.active_classification_name = self.classifications[name].Name
         return {
             'name': '',
             'description': '',

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -532,7 +532,7 @@ class BIM_PT_psets(Panel):
 
 
 class BIM_PT_classifications(Panel):
-    bl_label = 'IFC Classifications References'
+    bl_label = 'IFC Classifications'
     bl_idname = 'BIM_PT_classifications'
     bl_options = {'DEFAULT_CLOSED'}
     bl_space_type = 'PROPERTIES'
@@ -545,7 +545,6 @@ class BIM_PT_classifications(Panel):
 
         row = layout.row(align=True)
         row.prop(props, "classification", text='')
-        row.operator("bim.purge_project_classifications", text='', icon='TRASH')
         row.operator("bim.add_classification", text='', icon='ADD')
 
         if context.scene.BIMProperties.classification_references.raw_data:
@@ -555,7 +554,7 @@ class BIM_PT_classifications(Panel):
             row.operator("bim.unassign_classification")
         else:
             row = layout.row(align=True)
-            row.operator('bim.load_classification')
+            row.operator('bim.load_classification').is_file = True
 
         if not props.classifications:
             return
@@ -565,6 +564,7 @@ class BIM_PT_classifications(Panel):
         for index, classification in enumerate(props.classifications):
             row = layout.row(align=True)
             row.prop(classification, 'name')
+            row.operator('bim.load_classification', icon='IMPORT', text='').classification_index = index
             row.operator('bim.remove_classification', icon='X', text='').classification_index = index
             row = layout.row(align=True)
             row.prop(classification, 'source')