Return Value:
This function returns a UTF-8 string that represents the external Id of
the specified Document. If an error occurs, then NULL will be return and an error message will
be left at the current active Tcl interpreter (CDM_Interp).
Note that the returned object is property of the CDM and should never be
freed or modified in any way by the caller.
Notes:
This function is equivelant to tip_GetExternalId (Tcl API).
See Also:
tip_GetExternalId
Generated by: petasis@aias on Wed Aug 16 10:31:57 PM EEST 2006.