ObjectFactory factory=new ObjectFactory();
Graph gra=factory.createGraph();
List nodi=gra.getNode();
List archi=gra.getEdge();
Node nodo1=factory.createNode();
nodo1.setId("31457");
nodo1.setName("CPU_UTIL");
nodo1.setDeepness(0);
//creo la lista di metricattribute
List metrat=nodo1.getMetricAttribute();