@Override
 public StandardPropertyKeyMaker sortOrder(Order order) {
   super.sortOrder(order);
   return this;
 }
 @Override
 public StandardPropertyKeyMaker sortKey(PropertyKey... types) {
   super.sortKey(types);
   return this;
 }
 @Override
 public StandardPropertyKeyMaker invisible() {
   super.invisible();
   return this;
 }
 @Override
 public StandardPropertyKeyMaker signature(PropertyKey... types) {
   super.signature(types);
   return this;
 }
 @Override
 public StandardPropertyKeyMaker cardinality(Cardinality cardinality) {
   super.multiplicity(Multiplicity.convert(cardinality));
   return this;
 }