}
private OperandType toOperandType(CQLNode node) {
OperandType ot=new OperandType();
if(node instanceof CQLBooleanNode) {
CQLBooleanNode cbn=(CQLBooleanNode)node;
TripleType tt=new TripleType();
if(cbn instanceof CQLAndNode)
tt.set_boolean(new BooleanType("and", null));
else if(cbn instanceof CQLOrNode)
tt.set_boolean(new BooleanType("or", null));