xstream.bindElementToClass(String.class, "enumeration");
/*Values */
xstream.bindGroupToList(Values.class, "values", Value.class);
xstream.bindElementToClass(Value.class, "value");
xstream.addAdvancedHandler(new ValueHandler());
//xstream.bindElementToClassField(Value.class,"metadata", "value");
/* Variables*/
xstream.bindGroupToList(Variables.class, "variables");
xstream.bindElementToClass(Variable.class, "variable");