docs: function(feature, node) {
          if (feature.state) {
              var state = null;
              switch(feature.state) {
                  case OpenLayers.State.UPDATE:
                      state = "modify";
                  case OpenLayers.State.DELETE:
                      state = "delete";
              }
              if (state) {
                  node.setAttribute("action", state);
              }
          }    
      }