docs: function(data) {
          if(typeof data == "string") {
              data = OpenLayers.Format.XML.prototype.read.apply(this, [data]);
          }
          if(data && data.nodeType == 9) {
              data = data.documentElement;
          }
          var info = {measurements: [], observations: []};
          this.readNode(data, info);
          return info;
      }