DCX$_AGAIN         Informational. The map has not been created
                       and the map_addr and map_size arguments have
                       not been written because further analysis is
                       required. The data records must be analyzed
                       (using DCX$ANALYZE_DATA) again, and DCX$MAKE_
                       MAP must be called again before DCX$MAKE_MAP
                       will create the map and return the DCX$_NORMAL
                       status code.
    DCX$_INVCTX        Error. The context variable is invalid, or the
                       context area is invalid or corrupted. This may
                       be caused by a failure to call the appropriate
                       routine to initialize the context variable or
                       by an application program error.
    DCX$_NORMAL        Normal successful completion.

    This routine also returns any condition values returned by
    LIB$GET_VM and LIB$FREE_VM.