code: public PartialResponseChangesType<WebFacesPartialResponseDescriptor> getOrCreateChanges()
     {
        Node node = model.getOrCreate("changes");
        PartialResponseChangesType<WebFacesPartialResponseDescriptor> changes = new PartialResponseChangesTypeImpl<WebFacesPartialResponseDescriptor>(this, "changes", model, node);
        return changes;
     }
docs: If not already created, a new <code>changes</code> element with the given value will be created.
  Otherwise, the existing <code>changes</code> element will be returned.
  @return  a new or existing instance of <code>PartialResponseChangesType<WebFacesPartialResponseDescriptor></code>