context-name-1

       Is the name of a valid context variable or the name of a
       collection with a selected record. It must identify a record
       occurrence of a domain with a record type that participates in
       the specified set type. That record must not be a member of the
       sets specified by the TO list, but its record type must be a
       valid member type in the specified set types.

    context-name-2

       Is the name of a valid context variable or the name of a
       collection with a selected record. It must identify a record that
       participates in the specified set. If the SYSTEM owns the set,
       you do not need to establish a context for the set. If the set is
       not owned by the SYSTEM and the context name is not present, DEC
       DATATRIEVE uses the most recent single record context of a domain
       with a record type that participates in the specified set type.

    set-name

       Is the name of a set type.