public void clearQueries(){      	
    	this.aggregatedNodes.clear();
    	this.aggregatedPersistence.clear();
    	this.aggregatedEdges.clear();  
    	this.aggregatedEdges_Nodes.clear();
    	this.selectedEdge = -1;
    	this.selectedNode = -1;
    	this.releasedNode = -1;
     }