code: public Iterator<String> getPrefixes(String namespaceURI)
     {
        List<String> list = new ArrayList<String>();
        list.add(getPrefix(namespaceURI));
        return list.iterator();
     }
docs: Returns the list of registered for this URI namespace prefixes.
  @see javax.xml.namespace.NamespaceContext#getPrefixes(String)
  @param namespaceURI namespace URI
  @return list of registered for prefixes