overrid add node relat edg object node add node relat edg node model facad classifi node collect end model facad associ end node object end end add edg model facad associ end add edg model facad associ end model facad generaliz element node collect gener model facad gener node object gener gener add edg gener add edg gener collect special model facad special node object special special add edg special add edg special model facad model element node collect depend arrai list model facad client depend node depend add model facad supplier depend node object depend depend add edg depend add edg depend 