import java.util.StringJoiner;
import java.util.concurrent.CompletableFuture;
+import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
try {
for (String name : udfav.list()) {
QName providerName = NamespaceUtils.parsePrefixedName(provider, name);
+ if (providerName.getNamespaceURI().equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI))
+ continue; // skip prefix mapping
QName sessionName = new ContentName(providerName, getSession());
result.add(sessionName);
}