mxGraphModel.prototype.getChildCount=function(a){return null!=a?a.getChildCount():0};mxGraphModel.prototype.getChildAt=function(a,b){return null!=a?a.getChildAt(b):null};mxGraphModel.prototype.getChildren=function(a){return null!=a?a.children:null};mxGraphModel.prototype.getChildVertices=function(a){return this.getChildCells(a,!0,!1)};mxGraphModel.prototype.getChildEdges=function(a){return this.getChildCells(a,!1,!0)};