load diagram necessari connect fig messag fig associ role ad fig messag path item fig associ role post load post load namespac illeg state except namespac collabor diagram set collect messag iter msg iter collect own element model facad own element namespac iter oe iter own element iter layer lai layer oe iter object oe iter model facad associ role messag model facad messag msg iter messag iter msg iter object messag msg iter fig messag fig messag fig messag lai present messag fig messag fig messag add path item fig associ role lai 