/**
* Recursively finds the uri for the specified prefix.
*
* @param pref prefix
* @return uri
*/
public final byte[] uri(final byte[] pref) {
final Atts at = namespaces();
if (at != null) {
final byte[] s = at.value(pref);
if (s != null) return s;
final ANode n = parent();
if (n != null) return n.uri(pref);
}
return pref.length == 0 ? Token.EMPTY : null;
}
