SOR$DTYPE

   The SOR$DTYPE routine defines a key data type that is not
   normally supported by SORT/MERGE. (This routine is not currently
   supported by the high-performance Sort/Merge utility.) This
   routine returns a key data type code that can be used in the key_
   buffer argument to SOR$BEGIN_SORT or SOR$BEGIN_MERGE to describe
   special key data types (such as extended data types and National
   character set (NCS) collating sequences).

   Format

     SOR$DTYPE  [context] ,dtype_code ,usage ,p1
 

Additional information available:

Returns         Arguments       Description     Condition_Values_Returned