entity
    type:       $SCA_HANDLE
    access:     read only
    mechanism:  by reference

    An SCA entity handle describing the entity or relationship whose
    attributes are being obtained.

 attribute_kind
    type:       $SCA_ATTRIBUTE_KIND
    access:     read only
    mechanism:  by reference

    The kind of attribute to be obtained.

    Any attribute-kind can be specified on this routine.

 attribute_handle
    type:       $SCA_HANDLE
    access:     write only
    mechanism:  by reference

    An SCA attribute handle that is to describe the obtained
    attribute.

 iteration_context
    type:       $SCA_ITERATION_CONTEXT
    access:     read/write
    mechanism:  by reference

    Optional. The iteration-context. This longword must contain zero
    on the first call to this routine for a particular iteration. This
    routine uses the longword to maintain the iteration context. The
    caller must not change the contents of the longword.