/**
* Removes unused namespaces.
*
* @param node to be modified
*/
private static void noPreserve(final ANode node) {
final Atts ns = node.namespaces();
final byte[] pref = node.qname().prefix();
for (int i = ns.size() - 1; i >= 0; i--) {
boolean f = eq(ns.name(i), pref);
final AxisIter atts = node.attributes();
for (ANode it; f && (it = atts.next()) != null; ) {
f |= eq(it.qname().prefix(), pref);
}
if (!f) ns.delete(i);
}
}
