@Override public PlaceDescription extensionElement(Object element) { return (PlaceDescription) super.extensionElement(element); }
@Override public Event extensionElement(Object element) { return (Event) super.extensionElement(element); }
@Override public Person extensionElement(Object element) { return (Person) super.extensionElement(element); }
@Override public Relationship extensionElement(Object element) { return (Relationship) super.extensionElement(element); }