docs: function(config) {
          config = OpenLayers.Util.extend(config, {method: "POST"});
          // set content type to application/xml if it isn't already set
          config.headers = config.headers ? config.headers : {};
          if(!("CONTENT-TYPE" in OpenLayers.Util.upperCaseObject(config.headers))) {
              config.headers["Content-Type"] = "application/xml";
          }
          return OpenLayers.Request.issue(config);
      }