Description

   Call SOR$SPEC_FILE to pass a specification file name or a buffer
   with specification text to a sort or merge operation. Through
   the use of a specification file, you can selectively omit or
   include particular records from the sort or merge operation and
   specify the reformatting of the output records. (See the Sort
   Utility in the OpenVMS User's Manual for a complete description
   of specification files.)

   If you call the SOR$SPEC_FILE routine, you must do so before you
   call any other routines. You must pass either the spec_file or
   spec_buffer argument, but not both.

   Some of the return condition values are used with different
   severities, depending on whether SORT/MERGE can recover. Thus,
   if you want to check for a specific status, you should use
   LIB$MATCH_COND.