requires.append(" ");
String ns = req.getNamespaceURI();
if (XMLConstants.DEFAULT_NS_PREFIX.equals(ns)) {
requires.append(req.getLocalPart());
} else {
String pfx = config.lookupPrefix(ns);
if (pfx != null) {
requires.append(pfx + ":" + req.getLocalPart());
} else {
// SCA cvc-datatype-valid.1.2.1 XSD doesn't allow for {namespaceURI}localPart format
//requires.append(req.toString());