ElementCreator builder = registry.build(KEY);
// Local properties
builder.addAttribute(ETAG);
builder.addAttribute(GD_KIND);
builder.addAttribute(XML_BASE);
builder.addElement(TOTAL_RESULTS);
builder.addElement(START_INDEX);
builder.addElement(ITEMS_PER_PAGE);
builder.addElement(BatchOperation.KEY);
builder.addUndeclaredElementMarker();