VMS Help SCA, SCA Topics, Glossary, relationship_type  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The kind of relationship between two occurrences. For example, a
    CALLED_BY relationship between a declaration of a routine FOO and
    a reference to a routine BAR shows that routine FOO calls routine
    BAR. The relationship types that are valid for SCA are: CALLED_BY,
    CALLING, CONTAINED_BY, CONTAINING, TYPED_BY, and TYPING.