code: public String getURI(int index)
    {
      String ns = m_dh.getNamespaceOfNode(((Attr) m_attrs.item(index)));
      if(null == ns)
        ns = "";
      return ns;
    }
docs: Look up an attribute's Namespace URI by index.
  
  @param index The attribute index (zero-based).
  @return The Namespace URI, or the empty string if none
  is available, or null if the index is out of
  range.