text: /**
   * This class is a sequential id generator. A simple use of this class would be like so:
   *
   *     Ext.define('MyApp.data.MyModel', {
   *         extend: 'Ext.data.Model',
   *         identifier: 'sequential'
   *     });
   *     // assign id's of 1, 2, 3, etc.
   *
   * An example of a configured generator would be:
   *
   *     Ext.define('MyApp.data.MyModel', {
   *         extend: 'Ext.data.Model',
   *         identifier: {
   *             type: 'sequential',
   *             prefix: 'ID_',
   *             seed: 1000,
   *             increment: 10
   *         }
   *     });
   *     // assign id's of ID_1000, ID_1010, ID_1020, etc.
   *
   */
  Ext.define('Ext.data.identifier.Sequential', {
      extend: 'Ext.data.identifier.Generator',
  
      alias: 'data.identifier.sequential',
  
      config: {
          /**
           * @cfg {Number} increment
           * The number by which to adjust the `seed` after for the next sequential id.
           */
          increment: 1,
  
          /**
           * @cfg {String} prefix
           * The string to place in front of the sequential number for each generated id.
           */
          prefix: null,
  
          /**
           * @cfg {Number} seed
           * The number at which to start generating sequential id's.
           */
          seed: 1
      },
  
      /**
       * Generates and returns the next id.
       * @return {String/Number} The next id. If a {@link #prefix} was specified, returns
       * a String, otherwise returns a Number.
       */
      generate: function () {
          var me = this,
              seed = me._seed,
              prefix = me._prefix;
  
          me._seed += me._increment;
  
          return (prefix !== null) ? prefix + seed : seed;
      }
  });
  