context-name-1

       Is the name of a valid context variable or the name of a
       collection with a selected record. The target record must be a
       member of the sets specified by the TO list.

    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.