You can now associate IFC elements with Brick elements and navigate to them

src/ifcopenshell-python/ifcopenshell/api/library/add_reference.py

@@ -11,4 +11,10 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
+        if self.file.schema == "IFC2X3":
+            reference = self.file.createIfcLibraryReference()
+            references = list(self.settings["library"].LibraryReference or [])
+            references.append(reference)
+            self.settings["library"].LibraryReference = references
+            return reference
         return self.file.createIfcLibraryReference(ReferencedLibrary=self.settings["library"])

src/ifcopenshell-python/test/api/library/test_add_reference.py

@@ -8,3 +8,11 @@ class TestAddReference(test.bootstrap.IFC4):
         reference = ifcopenshell.api.run("library.add_reference", self.file, library=library)
         assert reference.is_a("IfcLibraryReference")
         assert reference.ReferencedLibrary == library
+
+
+class TestAddReferenceIFC2X3(test.bootstrap.IFC2X3):
+    def test_adding_a_reference(self):
+        library = ifcopenshell.api.run("library.add_library", self.file, name="Name")
+        reference = ifcopenshell.api.run("library.add_reference", self.file, library=library)
+        assert reference.is_a("IfcLibraryReference")
+        assert library.LibraryReference == (reference,)