docs: function(node, nsuri, name, def) {
          var value;
          var eles = this.getElementsByTagNameNS(node, nsuri, name);
          if(eles && eles[0] && eles[0].firstChild
              && eles[0].firstChild.nodeValue) {
              value = this.getChildValue(eles[0]);
          } else {
              value = (def == undefined) ? "" : def;
          }
          return value;
      }