Appendix B -- Advanced DXF Issues
Persistent Inter-Object Reference Handles
1005 Group Codes

1005 xdata group codes have the same behavior and semantics as soft pointers, which means that they are translated whenever the host object is merged into a different drawing. However, 1005 items are not translated to session-persistent identifiers, internally entity names in AutoLISP and ObjectARX. They are stored as handles.