whole_func_string: function(node1, node2) {
          return node1[node1.persistenceProperty].index - node2[node2.persistenceProperty].index;
      }
func_code_string: function(node1, node2) {
          return node1[node1.persistenceProperty].index - node2[node2.persistenceProperty].index;
      }
func_documentation_string: Sorter function for sorting records in index order
  @private
  @param {Ext.data.NodeInterface} node1
  @param {Ext.data.NodeInterface} node2
  @return {Number}