Simple, approachable, easy to learn. Good, legible UI. Makes editing XML as easy as regular text editing.

It's the industry standard for writing structured XML content and supports most, if not all, of the major XML authoring specifications

It's ability to convert a document into multiple outputs with just a click. The tool is DITA based to gives the ease of working along with xml. Gives easy collaboration features. The editor has three views: text, grid, and author. The text view seems to be the most helpful for showing where you are within the file as it highlights your position in blue and shows the overall structure of the XML file. The author view displays the individual tags well.