code: function() {
          var doc,
              nodes = this._nodes,
              query = this._query,
              root = this._queryRoot;
  
          if (query) {
              if (!root) {
                  if (nodes && nodes[0] && nodes[0].ownerDocument) {
                      root = nodes[0].ownerDocument;
                  }
              }
  
              this._nodes = Y.Selector.query(query, root);
          }
  
          return this;
      }
docs: Reruns the initial query, when created using a selector query
  @method refresh
  @chainable