The entity reference of the entities with a given gid in one file of a twin,
twin~twin:<twinId>.file:<fileId>/entities/<gid>, with no version qualifier. This is the
spelling a twin specification's representedBy takes.
Never throws. Returns undefined when twinId or fileId is not a lowercase uuid, or gid is
not a canonical IFC GlobalId; all three are used as written, with no case normalisation.
The entity reference of the entities with a given gid in one file of a twin,
twin~twin:<twinId>.file:<fileId>/entities/<gid>, with no version qualifier. This is the spelling a twin specification'srepresentedBytakes.Never throws. Returns
undefinedwhentwinIdorfileIdis not a lowercase uuid, orgidis not a canonical IFC GlobalId; all three are used as written, with no case normalisation.