Set prototypeAttributeNames = new PropertyListSet();
Set prototypeAttributeNames = new TreeSet();
  public synchronized Set getPrototypeAttributeNames() {    Set prototypeAttributeNames = new PropertyListSet();    Iterator prototypeAttributesIter = getPrototypeAttributes().iterator();    while (prototypeAttributesIter.hasNext()) {      EOAttribute attribute = (EOAttribute) prototypeAttributesIter.next();      prototypeAttributeNames.add(attribute.getName());    }    return prototypeAttributeNames;  }