VMS Help SCA, EXTRACT, MODULE, Qualifiers, /DECLARATION_CLASS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DECLARATION_CLASS=declaration-class

    Indicates the class of the module to be copied. The following
    declaration classes are supported:

       PRIMARY-Module implementation
       ASSOCIATED-Module specification

    If you do not specify a declaration class, SCA extracts both
    classes, if they exist.