You can now relate and export document references and information entities

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -55,6 +55,7 @@ if bpy is not None:
         operator.RemoveMaterialPset,
         operator.AddDocumentInformation,
         operator.RemoveDocumentInformation,
+        operator.AssignDocumentInformation,
         operator.AddDocumentReference,
         operator.RemoveDocumentReference,
         operator.AssignDocumentReference,

src/ifcblenderexport/blenderbim/bim/export_ifc.py

@@ -689,6 +689,7 @@ class IfcParser():
             results[reference.name] = {
                 'ifc': None,
                 'raw': reference,
+                'referenced_document': reference.referenced_document,
                 'attributes': attributes
             }
         return results
@@ -1347,6 +1348,9 @@ class IfcExporter():
 
     def create_document_references(self):
         for reference in self.ifc_parser.document_references.values():
+            if reference['referenced_document'] \
+                    and reference['referenced_document'] in self.ifc_parser.document_information:
+                reference['attributes']['ReferencedDocument'] = self.ifc_parser.document_information[reference['referenced_document']]['ifc']
             reference['ifc'] = self.file.create_entity(
                 'IfcDocumentReference', **reference['attributes'])
             self.file.createIfcRelAssociatesDocument(

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -812,6 +812,20 @@ class RemoveDocumentInformation(bpy.types.Operator):
         return {'FINISHED'}
 
 
+class AssignDocumentInformation(bpy.types.Operator):
+    bl_idname = 'bim.assign_document_information'
+    bl_label = 'Assign Document Information'
+    index: bpy.props.IntProperty()
+
+    def execute(self, context):
+        reference = bpy.context.scene.BIMProperties.document_references[self.index]
+        index = bpy.context.scene.BIMProperties.active_document_information_index
+        info = bpy.context.scene.BIMProperties.document_information
+        if index < len(info):
+            reference.referenced_document = info[index].name
+        return {'FINISHED'}
+
+
 class AddDocumentReference(bpy.types.Operator):
     bl_idname = 'bim.add_document_reference'
     bl_label = 'Add Document Reference'

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -427,6 +427,7 @@ class DocumentReference(PropertyGroup):
     name: StringProperty(name="Identification")
     human_name: StringProperty(name="Name")
     description: StringProperty(name="Description")
+    referenced_document: StringProperty(name="Referenced Document")
 
 
 class BcfTopic(PropertyGroup):

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -171,6 +171,9 @@ class BIM_PT_document_information(Panel):
                 row.prop(reference, 'location')
                 row = layout.row()
                 row.prop(reference, 'description')
+                row = layout.row(align=True)
+                row.prop(reference, 'referenced_document')
+                row.operator('bim.assign_document_information', icon='LINKED', text='').index = props.active_document_reference_index
 
             row = layout.row(align=True)
             row.operator('bim.assign_document_reference', text='Assign Reference')
@@ -212,6 +215,8 @@ class BIM_PT_documents(Panel):
                     row.prop(reference, 'location')
                     row = layout.row()
                     row.prop(reference, 'description')
+                    row = layout.row()
+                    row.prop(reference, 'referenced_document')
                 else:
                     layout.label(text="Reference is invalid")