code: function(feature, options) {
          var srsName = options && options.srsName;
          if(!srsName) {
              if(feature && feature.layer) {
                  srsName = feature.layer.projection.getCode();
              } else {
                  srsName = this.srsName;
              }
          }
          return srsName;
      }
docs: Method: getSrsName