code: function(xmlNode, namespace, tagName) {
          var value;
          var nodeList = this.getElementsByTagNameNS(xmlNode, namespace, tagName);
          try {
              value = OpenLayers.Util.getXmlNodeValue(nodeList[0]);
          } catch(e) {
              value = null;
          }
       
          return value;
      }
docs: Method: parseProperty
  Convenience method to find a node and return its value
  
  Parameters:
  xmlNode    - {<DOMElement>}
  namespace  - {String} namespace of the node to find
  tagName    - {String} name of the property to parse
  
  Returns:
  {String} The value for the requested property (defaults to null)