set model element namespac object model element object ns model element provid namespac diagram root ns namespac ns namespac ns project root haven succeed get namespac abort ns try set namespac exist valu don work model facad namespac model element ns core helper core helper model core helper model manag helper model helper model model manag helper model helper cyclic ownership ns model element core helper valid namespac model element ns core helper set model element contain model element ns todo associ correct owner namespac issu 