Complete structure of the XML – as a “flat” database – with records and columns / fields.
You can use it to browse / navigate thought the XML or use it to modify formatting or structure.
As same XML Elements can be nested in differennt XML Elements – you can’t apply different Styles to them using built-in options – it’s always the same or nothing.
With IDT – you can select specific nested location – and assign specific Style(s) to all instances.