docs: function(jid, node, success, error, timeout)
      {
          var attrs = {xmlns: Strophe.NS.DISCO_INFO};
          if (node)
              attrs.node = node;
  
          var info = $iq({from:this._connection.jid,
                           to:jid, type:'get'}).c('query', attrs);
          this._connection.sendIQ(info, success, error, timeout);
      }