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

    A query question which combines one or more attribute selections
    (such as name=foo, symbol=routine) using AND, OR, NOT, and XOR.
    Some examples are:

      name=foo and symbol=routine and occurrence=primary
      name=foo_module and occurrence=compilation_unit