QXmlNamespaceSupport *clone = new QXmlNamespaceSupport;
clone->setPrefix("", copy->uri(""));
QStringList prefixes = copy->prefixes();
for (int i=0; i<prefixes.size(); ++i)
clone->setPrefix(prefixes.at(i), copy->uri(prefixes.at(i)));
return clone;
delete (QXmlNamespaceSupport *)copy;