@Override
public boolean visit(Expression s) throws Exception {
if (s instanceof RutaRuleElement) {
RutaRuleElement re = (RutaRuleElement) s;
Expression head = re.getHead();
if (head instanceof FeatureMatchExpression) {
FeatureMatchExpression fme = (FeatureMatchExpression) head;
String text = fme.getFeature().getText();
int lastIndexOf = text.lastIndexOf('.');
String twf = text.substring(0, lastIndexOf);