docs: function () {
              if (this._isProcessing) {
                  return;
              }
              this.$assert(33, this._logicalPaths.length > 0);
              this._isProcessing = true;
              (require("./IO")).asyncRequest({
                  sender : {
                      classpath : this.$classpath,
                      logicalPaths : this._logicalPaths
                  },
                  url : require("./DownloadMgr").getURLWithTimestamp(this._url), // add a timestamp to the URL if
                  // required
                  callback : {
                      fn : this._onFileReceive,
                      onerror : this._onFileReceive,
                      scope : this
                  },
                  expectedResponseType : "text"
              });
          }