:- initialization( logtalk_load([ hierarchyp, proto_hierarchyp, proto_hierarchy, class_hierarchyp, class_hierarchy])). /* If you intend to use the FOP XSL:FO processor for generating PDF documenting files, comment the directive above and uncomment the directive below :- initialization( logtalk_load( [hierarchyp, proto_hierarchyp, proto_hierarchy, class_hierarchyp, class_hierarchy], [xmlsref(standalone)])). */