text: YUI.add('io-base', function(Y) {
  
     /**
      * Base IO functionality. Provides basic XHR transport support.
      * @module io
      * @submodule io-base
      */
  
     /**
      * The io class is a utility that brokers HTTP requests through a simplified
      * interface.  Specifically, it allows JavaScript to make HTTP requests to
      * a resource without a page reload.  The underlying transport for making
      * same-domain requests is the XMLHttpRequest object.  YUI.io can also use
      * Flash, if specified as a transport, for cross-domain requests.
      *
      * @class io
      */
  
     /**
      * @event io:start
      * @description This event is fired by YUI.io when a transaction is initiated.
      * @type Event Custom
      */
      var E_START = 'io:start',
  
     /**
      * @event io:complete
      * @description This event is fired by YUI.io when a transaction is complete.
      * Response status and data are accessible, if available.
      * @type Event Custom
      */
      E_COMPLETE = 'io:complete',
  
     /**
      * @event io:success
      * @description This event is fired by YUI.io when a transaction is complete, and
      * the HTTP status resolves to HTTP2xx.
      * @type Event Custom
      */
      E_SUCCESS = 'io:success',
  
     /**
      * @event io:failure
      * @description This event is fired by YUI.io when a transaction is complete, and
      * the HTTP status resolves to HTTP4xx, 5xx and above.
      * @type Event Custom
      */
      E_FAILURE = 'io:failure',
  
     /**
      * @event io:end
      * @description This event signifies the end of the transaction lifecycle.  The
      * transaction transport is destroyed.
      * @type Event Custom
      */
      E_END = 'io:end',
  
      //--------------------------------------
      //  Properties
      //--------------------------------------
     /**
      * @description A transaction counter that increments for each transaction.
      *
      * @property transactionId
      * @private
      * @static
      * @type int
      */
      transactionId = 0,
  
     /**
      * @description Object of default HTTP headers to be initialized and sent
      * for all transactions.
      *
      * @property _headers
      * @private
      * @static
      * @type object
      */
      _headers = {
          'X-Requested-With' : 'XMLHttpRequest'
      },
  
     /**
      * @description Object that stores timeout values for any transaction with
      * a defined "timeout" configuration property.
      *
      * @property _timeout
      * @private
      * @static
      * @type object
      */
      _timeout = {},
  
      // Window reference
      w = Y.config.win;
  
      //--------------------------------------
      //  Methods
      //--------------------------------------
  
     /**
      * @description Method that creates the XMLHttpRequest transport
      *
      * @method _xhr
      * @private
      * @static
      * @return object
      */
      function _xhr() {
          return w.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
      }
  
  
     /**
      * @description Method that increments _transactionId for each transaction.
      *
      * @method _id
      * @private
      * @static
      * @return int
      */
      function _id() {
          var id = transactionId;
  
          transactionId++;
  
          return id;
      }
  
     /**
      * @description Method that creates a unique transaction object for each
      * request.
      *
      * @method _create
      * @private
      * @static
      * @param {number} c - configuration object subset to determine if
      *                     the transaction is an XDR or file upload,
      *                     requiring an alternate transport.
      * @param {number} i - transaction id
      * @return object
      */
      function _create(c, i) {
          var o = {};
              o.id = Y.Lang.isNumber(i) ? i : _id();
              c = c || {};
  
          if (!c.use && !c.upload) {
              o.c = _xhr();
          }
          else if (c.use) {
              if (c.use === 'native') {
                  if (w.XDomainRequest) {
                      o.c = new XDomainRequest();
                      o.t = c.use;
                  }
                  else {
                      o.c = _xhr();
                  }
              }
              else {
                  o.c = Y.io._transport[c.use];
                  o.t = c.use;
              }
          }
          else {
              o.c = {};
          }
  
          return o;
      }
  
  
      function _destroy(o) {
          if (w) {
              if (o.c && w.XMLHttpRequest) {
                  o.c.onreadystatechange = null;
              }
  			else if (Y.UA.ie === 6 && !o.t) {
  				// IE, when using XMLHttpRequest as an ActiveX Object, will throw
  				// a "Type Mismatch" error if the event handler is set to "null".
  				o.c.abort();
  			}
          }
  
          o.c = null;
          o = null;
      }
  
     /**
      * @description Method for creating and subscribing transaction events.
      *
      * @method _tE
      * @private
      * @static
      * @param {string} e - event to be published
      * @param {object} c - configuration data subset for event subscription.
      *
      * @return void
      */
      function _tE(e, c) {
          var eT = new Y.EventTarget().publish('transaction:' + e),
              a = c.arguments,
              cT = c.context || Y;
  
          if (a) {
              eT.on(c.on[e], cT, a);
          }
          else {
              eT.on(c.on[e], cT);
          }
  
          return eT;
      }
  
     /**
      * @description Fires event "io:start" and creates, fires a
      * transaction-specific start event, if config.on.start is
      * defined.
      *
      * @method _ioStart
      * @private
      * @static
      * @param {number} id - transaction id
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _ioStart(id, c) {
          var a = c.arguments;
  
          if (a) {
              Y.fire(E_START, id, a);
          }
          else {
              Y.fire(E_START, id);
          }
  
          if (c.on && c.on.start) {
              _tE('start', c).fire(id);
          }
      }
  
  
     /**
      * @description Fires event "io:complete" and creates, fires a
      * transaction-specific "complete" event, if config.on.complete is
      * defined.
      *
      * @method _ioComplete
      * @private
      * @static
      * @param {object} o - transaction object.
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _ioComplete(o, c) {
          var r = o.e ? { status: 0, statusText: o.e } : o.c,
              a = c.arguments;
  
          if (a) {
              Y.fire(E_COMPLETE, o.id, r, a);
          }
          else {
              Y.fire(E_COMPLETE, o.id, r);
          }
  
          if (c.on && c.on.complete) {
              _tE('complete', c).fire(o.id, r);
          }
      }
  
     /**
      * @description Fires event "io:end" and creates, fires a
      * transaction-specific "end" event, if config.on.end is
      * defined.
      *
      * @method _ioEnd
      * @private
      * @static
      * @param {object} o - transaction object.
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _ioEnd(o, c) {
          var a = c.arguments;
  
          if (a) {
              Y.fire(E_END, o.id, a);
          }
          else {
              Y.fire(E_END, o.id);
          }
  
          if (c.on && c.on.end) {
              _tE('end', c).fire(o.id);
          }
  
          _destroy(o);
      }
  
     /**
      * @description Fires event "io:success" and creates, fires a
      * transaction-specific "success" event, if config.on.success is
      * defined.
      *
      * @method _ioSuccess
      * @private
      * @static
      * @param {object} o - transaction object.
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _ioSuccess(o, c) {
          var a = c.arguments;
  
          if (a) {
              Y.fire(E_SUCCESS, o.id, o.c, a);
          }
          else {
              Y.fire(E_SUCCESS, o.id, o.c);
          }
  
          if (c.on && c.on.success) {
              _tE('success', c).fire(o.id, o.c);
          }
  
          _ioEnd(o, c);
      }
  
     /**
      * @description Fires event "io:failure" and creates, fires a
      * transaction-specific "failure" event, if config.on.failure is
      * defined.
      *
      * @method _ioFailure
      * @private
      * @static
      * @param {object} o - transaction object.
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _ioFailure(o, c) {
          var r = o.e ? { status: 0, statusText: o.e } : o.c,
              a = c.arguments;
  
          if (a) {
              Y.fire(E_FAILURE, o.id, r, a);
          }
          else {
              Y.fire(E_FAILURE, o.id, r);
          }
  
          if (c.on && c.on.failure) {
              _tE('failure', c).fire(o.id, r);
          }
  
          _ioEnd(o, c);
      }
  
     /**
      * @description Resends an XDR transaction, using the Flash tranport,
      * if the native transport fails.
      *
      * @method _resend
      * @private
      * @static
  
      * @param {object} o - Transaction object generated by _create().
      * @param {string} uri - qualified path to transaction resource.
      * @param {object} c - configuration object for the transaction.
      *
      * @return void
      */
      function _resend(o, uri, c, d) {
          _destroy(o);
          c.xdr.use = 'flash';
          // If the original request included serialized form data and
          // additional data are defined in configuration.data, it must
          // be reset to prevent data duplication.
          c.data = c.form && d ? d : null;
  
          return Y.io(uri, c, o.id);
      }
  
     /**
      * @description Method that concatenates string data for HTTP GET transactions.
      *
      * @method _concat
      * @private
      * @static
      * @param {string} s - URI or root data.
      * @param {string} d - data to be concatenated onto URI.
      * @return int
      */
      function _concat(s, d) {
          s += ((s.indexOf('?') == -1) ? '?' : '&') + d;
          return s;
      }
  
     /**
      * @description Method that stores default client headers for all transactions.
      * If a label is passed with no value argument, the header will be deleted.
      *
      * @method _setHeader
      * @private
      * @static
      * @param {string} l - HTTP header
      * @param {string} v - HTTP header value
      * @return int
      */
      function _setHeader(l, v) {
          if (v) {
              _headers[l] = v;
          }
          else {
              delete _headers[l];
          }
      }
  
     /**
      * @description Method that sets all HTTP headers to be sent in a transaction.
      *
      * @method _setHeaders
      * @private
      * @static
      * @param {object} o - XHR instance for the specific transaction.
      * @param {object} h - HTTP headers for the specific transaction, as defined
      *                     in the configuration object passed to YUI.io().
      * @return void
      */
      function _setHeaders(o, h) {
          var p;
              h = h || {};
  
          for (p in _headers) {
              if (_headers.hasOwnProperty(p)) {
  				/*
                  if (h[p]) {
                      // Configuration headers will supersede preset io headers,
                      // if headers match.
                      continue;
                  }
                  else {
                      h[p] = _headers[p];
                  }
  				*/
  				if (!h[p]) {
  					h[p] = _headers[p];
  				}
              }
          }
  
          for (p in h) {
              if (h.hasOwnProperty(p)) {
  				if (h[p] !== 'disable') {
                  	o.setRequestHeader(p, h[p]);
  				}
  			}
          }
      }
  
     /**
      * @description Terminates a transaction due to an explicit abort or
      * timeout.
      *
      * @method _ioCancel
      * @private
      * @static
      * @param {object} o - Transaction object generated by _create().
      * @param {string} s - Identifies timed out or aborted transaction.
      *
      * @return void
      */
      function _ioCancel(o, s) {
          if (o && o.c) {
              o.e = s;
              o.c.abort();
          }
      }
  
     /**
      * @description Starts timeout count if the configuration object
      * has a defined timeout property.
      *
      * @method _startTimeout
      * @private
      * @static
      * @param {object} o - Transaction object generated by _create().
      * @param {object} t - Timeout in milliseconds.
      * @return void
      */
      function _startTimeout(o, t) {
          _timeout[o.id] = w.setTimeout(function() { _ioCancel(o, 'timeout'); }, t);
      }
  
     /**
      * @description Clears the timeout interval started by _startTimeout().
      *
      * @method _clearTimeout
      * @private
      * @static
      * @param {number} id - Transaction id.
      * @return void
      */
      function _clearTimeout(id) {
          w.clearTimeout(_timeout[id]);
          delete _timeout[id];
      }
  
     /**
      * @description Method that determines if a transaction response qualifies
      * as success or failure, based on the response HTTP status code, and
      * fires the appropriate success or failure events.
      *
      * @method _handleResponse
      * @private
      * @static
      * @param {object} o - Transaction object generated by _create().
      * @param {object} c - Configuration object passed to io().
      * @return void
      */
      function _handleResponse(o, c) {
          var status;
  
          try {
  			status = (o.c.status && o.c.status !== 0) ? o.c.status : 0;
          }
          catch(e) {
              status = 0;
          }
  
          // IE reports HTTP 204 as HTTP 1223.
          if (status >= 200 && status < 300 || status === 1223) {
              _ioSuccess(o, c);
          }
          else {
              _ioFailure(o, c);
          }
      }
  
     /**
      * @description Event handler bound to onreadystatechange.
      *
      * @method _readyState
      * @private
      * @static
      * @param {object} o - Transaction object generated by _create().
      * @param {object} c - Configuration object passed to YUI.io().
      * @return void
      */
      function _readyState(o, c) {
          if (o.c.readyState === 4) {
              if (c.timeout) {
                  _clearTimeout(o.id);
              }
  
              w.setTimeout(
                  function() {
                      _ioComplete(o, c);
                      _handleResponse(o, c);
                  }, 0);
          }
      }
  
     /**
      * @description Method for requesting a transaction. _io() is implemented as
      * yui.io().  Each transaction may include a configuration object.  Its
      * properties are:
      *
      * method: HTTP method verb (e.g., GET or POST). If this property is not
      *         not defined, the default value will be GET.
      *
      * data: This is the name-value string that will be sent as the transaction
      *       data.  If the request is HTTP GET, the data become part of
      *       querystring. If HTTP POST, the data are sent in the message body.
      *
      * xdr: Defines the transport to be used for cross-domain requests.  By
      *      setting this property, the transaction will use the specified
      *      transport instead of XMLHttpRequest.
      *      The properties are:
      *      {
      *        use: Specify the transport to be used: 'flash' and 'native'
      *        dataType: Set the value to 'XML' if that is the expected
      *                  response content type.
      *      }
      *
      *
      * form: This is a defined object used to process HTML form as data.  The
      *       properties are:
      *       {
      *         id: Node object or id of HTML form.
      *         useDisabled: Boolean value to allow disabled HTML form field
      *                      values to be sent as part of the data.
      *       }
      *
      * on: This is a defined object used to create and handle specific
      *     events during a transaction lifecycle.  These events will fire in
      *     addition to the global io events. The events are:
      *     start - This event is fired when a request is sent to a resource.
      *     complete - This event fires when the transaction is complete.
      *     success - This event fires when the response status resolves to
      *               HTTP 2xx.
      *     failure - This event fires when the response status resolves to
      *               HTTP 4xx, 5xx; and, for all transaction exceptions,
      *               including aborted transactions and transaction timeouts.
      *     end -  This even is fired at the conclusion of the transaction
      *            lifecycle, after a success or failure resolution.
      *
      *     The properties are:
      *     {
      *       start: function(id, arguments){},
      *       complete: function(id, responseobject, arguments){},
      *       success: function(id, responseobject, arguments){},
      *       failure: function(id, responseobject, arguments){},
      *       end: function(id, arguments){}
      *     }
      *     Each property can reference a function or be written as an
      *     inline function.
      *
      * sync: To enable synchronous transactions, set the configuration property
      *       "sync" to true; the default behavior is false.  Synchronous
      *       transactions are limited to same-domain requests only.
      *
      * context: Object reference for all defined transaction event handlers
      *          when it is implemented as a method of a base object. Defining
      *          "context" will set the reference of "this," used in the
      *          event handlers, to the context value.  In the case where
      *          different event handlers all have different contexts,
      *          use Y.bind() to set the execution context, bypassing this
      *          configuration.
      *
      * headers: This is a defined object of client headers, as many as.
      *          desired for the transaction.  The object pattern is:
      *          { 'header': 'value' }.
      *
      * timeout: This value, defined as milliseconds, is a time threshold for the
      *          transaction. When this threshold is reached, and the transaction's
      *          Complete event has not yet fired, the transaction will be aborted.
      *
      * arguments: Object, array, string, or number passed to all registered
      *            event handlers.  This value is available as the second
      *            argument in the "start" and "abort" event handlers; and, it is
      *            the third argument in the "complete", "success", and "failure"
      *            event handlers.
      *
      * @method _io
      * @private
      * @static
      * @param {string} uri - qualified path to transaction resource.
      * @param {object} c - configuration object for the transaction.
      * @param {number} i - transaction id, if already set.
      * @return object
      */
      function _io(uri, c, i) {
          var f, o, d, m, r, s, oD, a, j,
              u = uri;
              c = Y.Object(c);
              o = _create(c.xdr || c.form, i);
              m = c.method ? c.method = c.method.toUpperCase() : c.method = 'GET';
              s = c.sync;
              oD = c.data;
  
          //To serialize an object into a key-value string, add the
          //QueryString module to the YUI instance's 'use' method.
          if (Y.Lang.isObject(c.data) && Y.QueryString) {
              c.data = Y.QueryString.stringify(c.data);
          }
  
          if (c.form) {
              if (c.form.upload) {
                  // This is a file upload transaction, calling
                  // upload() in io-upload-iframe.
                  return Y.io.upload(o, uri, c);
              }
              else {
                  // Serialize HTML form data.
                  f = Y.io._serialize(c.form, c.data);
                  if (m === 'POST' || m === 'PUT') {
                      c.data = f;
                  }
                  else if (m === 'GET') {
                      uri = _concat(uri, f);
                  }
              }
          }
  
          if (c.data && m === 'GET') {
              uri = _concat(uri, c.data);
          }
  
          if (c.data && m === 'POST') {
              c.headers = Y.merge({ 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' }, c.headers);
          }
  
          if (o.t) {
              return Y.io.xdr(uri, o, c);
          }
  
          if (!s) {
              o.c.onreadystatechange = function() { _readyState(o, c); };
          }
  
          try {
              o.c.open(m, uri, s ? false : true);
              // Will work only in browsers that implement the
              // Cross-Origin Resource Sharing draft.
              if (c.xdr && c.xdr.credentials) {
                  o.c.withCredentials = true;
              }
          }
          catch(e1) {
              if (c.xdr) {
                  // This exception is usually thrown by browsers
                  // that do not support native XDR transactions.
                  return _resend(o, u, c, oD);
              }
          }
  
          _setHeaders(o.c, c.headers);
          _ioStart(o.id, c);
          try {
              // Using "null" with HTTP POST will  result in a request
              // with no Content-Length header defined.
              o.c.send(c.data || '');
              if (s) {
                  d = o.c;
                  a  = ['status', 'statusText', 'responseText', 'responseXML'];
                  r = c.arguments ? { id: o.id, arguments: c.arguments } : { id: o.id };
  
                  for (j = 0; j < 4; j++) {
                      r[a[j]] = o.c[a[j]];
                  }
  
                  r.getAllResponseHeaders = function() { return d.getAllResponseHeaders(); };
                  r.getResponseHeader = function(h) { return d.getResponseHeader(h); };
                  _ioComplete(o, c);
                  _handleResponse(o, c);
  
                  return r;
              }
          }
          catch(e2) {
              if (c.xdr) {
                  // This exception is usually thrown by browsers
                  // that do not support native XDR transactions.
                  return _resend(o, u, c, oD);
              }
          }
  
          // If config.timeout is defined, and the request is standard XHR,
          // initialize timeout polling.
          if (c.timeout) {
              _startTimeout(o, c.timeout);
          }
  
          return {
              id: o.id,
              abort: function() {
                  return o.c ? _ioCancel(o, 'abort') : false;
              },
              isInProgress: function() {
                  return o.c ? o.c.readyState !== 4 && o.c.readyState !== 0 : false;
              }
          };
      }
  
      _io.start = _ioStart;
      _io.complete = _ioComplete;
      _io.success = _ioSuccess;
      _io.failure = _ioFailure;
      _io.end = _ioEnd;
      _io._id = _id;
      _io._timeout = _timeout;
  
      //--------------------------------------
      //  Begin public interface definition
      //--------------------------------------
     /**
      * @description Method that stores default client headers for all transactions.
      * If a label is passed with no value argument, the header will be deleted.
      * This is the interface for _setHeader().
      *
      * @method header
      * @public
      * @static
      * @param {string} l - HTTP header
      * @param {string} v - HTTP header value
      * @return int
      */
      _io.header = _setHeader;
  
     /**
      * @description Method for requesting a transaction. This
      * is the interface for _io().
      *
      * @method io
      * @public
      * @static
      * @param {string} uri - qualified path to transaction resource.
      * @param {object} c - configuration object for the transaction.
      * @return object
      */
      Y.io = _io;
      Y.io.http = _io;
  
  
  
  }, '@VERSION@' ,{requires:['event-custom-base', 'querystring-stringify-simple']});
  