rem: }, 
add: } 
context:   redoTransaction: function ()  {    this.beginUpdateBatch();    for (var i=0; i<this.item.length; ++i) {      if (this.isValid[i]) {        this.RDFC.Init(this.BMDS, this.parent[i]);        this.RDFC.InsertElementAt(this.item[i], this.index[i], true);      }    }    this.endUpdateBatch();  },
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