The Packagefile Manager can also display the XML data in tree:
This editor is useful if you only need to edit a certain parameter of one of the tags. You need to select the menu entry File\OK to save the file back to the main editor. The saving procedure will also format the file by indenting the XML tags. Please note that it only supports one comment for each tag, multiple comments will be discarded. So please use the Tree-mode editor carefully, we recommend to only use the main editor.