handle
    type:       $SCA_HANDLE
    access:     read/write
    mechanism:  by reference

    An SCA attribute handle describing either an attribute or an
    entity whose value is to be obtained.

 attribute_value
    type:       character string
    access:     read/write
    mechanism:  by descriptor

    The (string) value of the attribute being selected.

 attribute_kind
    type:       $SCA_ATTRIBUTE_KIND
    access:     read/write
    mechanism:  by reference

    Optional. The kind of attribute to be obtained.