code: protected String getNodeNutchContent(Element e, String key) {
         NodeList nodes = e.getElementsByTagNameNS(NUTCH_NS, key);
         String result = null;
         if (nodes != null && nodes.getLength() > 0) {
             result = getNodeTextValue(nodes.item(0));
         }
         return (result == null || result.length() == 0)? null: result;
     }
docs: extract the text content of a single nutch: tag under a node