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

    Tells you what symbol class a declaration is (subroutine,
    function, variable). For example, both procedures and functions
    (in Pascal terms) belong to the routine symbol class, but their
    declaration classes are different. The declaration class tells
    the user whether a declaration is a primary declaration or
    an associated declaration. SCA uses the declaration class to
    decide what to display as the occurrence class in the result of a
    FIND command. The user can find the declaration class using the
    callable interface.