rem: this._oldPostData = PlacesUtils.getPostDataForURI(this._uri); PlacesUtils.setPostDataForURI(this._uri, this._newPostData); 
add: this._oldPostData = PlacesUtils.getPostDataForBookmark(this._id); PlacesUtils.setPostDataForBookmark(this.id, this._newPostData); 
context:   doTransaction: function PEUPDT_doTransaction() {    this._oldPostData = PlacesUtils.getPostDataForURI(this._uri);    PlacesUtils.setPostDataForURI(this._uri, this._newPostData);  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/7581e1894eb80da1b6068e4ffa6084ba86975798/nsPlacesTransactionsService.js/buggy/browser/components/places/src/nsPlacesTransactionsService.js