The SCA$QUERY_GET_ATTRIBUTE routine gets a handle to an attribute
    of an entity.

    If the iteration_context parameter is not specified, then
    this routine finds the first attribute of the specified kind
    (attribute_kind) and updates attribute_handle to describe that
    attribute.

    In general, several attributes can be associated with a particular
    entity. With this routine you can find all of those attributes by
    using the iteration_context parameter.

    This routine will become obsolete in a future version of SCA. The
    SCA$GET_ATTRIBUTE routine supersedes this routine.