/**
* Returns the uri for the specified prefix.
*
* @param pref prefix
* @param ctx query context
* @return uri
*/
public final byte[] uri(final byte[] pref, final QueryContext ctx) {
final Atts at = ns();
if (at != null) {
final int i = at.get(pref);
if (i != -1) return at.val[i];
final ANode n = parent();
if (n != null) return n.uri(pref, ctx);
}
return pref.length == 0 ? Token.EMPTY : null;
}
