mxCodec.prototype.addElement=function(a){if(a.nodeType==mxConstants.NODETYPE_ELEMENT){var b=a.getAttribute("id");if(null!=b)if(null==this.elements[b])this.elements[b]=a;else if(this.elements[b]!=a)throw Error(b+": Duplicate ID");}for(a=a.firstChild;null!=a;)this.addElement(a),a=a.nextSibling};mxCodec.prototype.getId=function(a){var b=null;null!=a&&(b=this.reference(a),null==b&&a instanceof mxCell&&(b=a.getId(),null==b&&(b=mxCellPath.create(a),0==b.length&&(b="root"))));return b};