Minor fix for IFC2X3

src/ifcblenderexport/blenderbim/bim/export_ifc.py

@@ -640,7 +640,11 @@ class IfcParser():
     def get_classification_reference_maps(self):
         results = {}
         for filename, classification in self.classifications.items():
-            results[filename] = { e.Identification: e for e in schema.ifc.classification_files[filename].by_type('IfcClassificationReference')}
+            ifc_file = schema.ifc.classification_files[filename]
+            if ifc_file.schema == 'IFC2X3':
+                results[filename] = { 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')}
         return results
 
     def get_classification_references(self):
@@ -1104,9 +1108,10 @@ class IfcExporter():
         self.ifc_export_settings = ifc_export_settings
         self.ifc_parser = ifc_parser
         self.qto_calculator = qto_calculator
+        self.schema = 'IFC4'
 
     def export(self, selected_objects):
-        self.file = ifcopenshell.open(self.template_file)
+        self.file = ifcopenshell.file(schema=self.schema)
         self.ifc_parser.parse(selected_objects)
         self.create_units()
         self.create_people()

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -2530,6 +2530,8 @@ class PushRepresentation(bpy.types.Operator):
 
     # Warning: This is an incredibly experimental operator.
     def execute(self, context):
+        self.file = ifc.IfcStore.get_file()
+
         logger = logging.getLogger('ExportIFC')
         output_file = 'tmp.ifc'
         ifc_export_settings = export_ifc.IfcExportSettings.factory(context, output_file, logger)
@@ -2537,13 +2539,12 @@ class PushRepresentation(bpy.types.Operator):
         ifc_parser.parse([bpy.context.active_object])
         qto_calculator = export_ifc.QtoCalculator()
         self.ifc_exporter = export_ifc.IfcExporter(ifc_export_settings, ifc_parser, qto_calculator)
-        self.ifc_exporter.file = ifcopenshell.open(self.ifc_exporter.template_file)
+        self.ifc_exporter.file = ifcopenshell.file(schema=self.file.schema)
         self.ifc_exporter.create_origin()
         self.ifc_exporter.create_rep_context()
         self.ifc_exporter.create_representations()
 
         self.context, self.subcontext, self.target_view, self.mesh_name = bpy.context.active_object.data.name.split('/')
-        self.file = ifc.IfcStore.get_file()
         rep_context = self.get_geometric_representation_context()
 
         for key, rep in self.ifc_exporter.ifc_parser.representations.items():

src/ifcblenderexport/blenderbim/bim/schema.py

@@ -74,7 +74,8 @@ class IfcSchema():
 
     def get_classification_references(self, classification):
         references = {}
-        if not classification.HasReferences:
+        if not hasattr(classification, 'HasReferences') \
+                or not classification.HasReferences:
             return references
         for reference in classification.HasReferences:
             references[reference.Identification] = {

src/ifcblenderexport/blenderbim/bim/schema/template.ifc

@@ -1,9 +0,0 @@
-ISO-10303-21;
-HEADER;
-FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
-FILE_NAME('$filename','2019-05-12T12:33:45',('$owner','$email'),('$company'),'IfcOpenShell','IfcOpenShell','');
-FILE_SCHEMA(('IFC4'));
-ENDSEC;
-DATA;
-ENDSEC;
-END-ISO-10303-21;