Having used your UDL for skins all this time, it's nice to see familiar colours again.
Below is what I have been using for editing Theater Modes - Notepad++'s default for XML files.
That's very good to
Let me know if you find some functionality that you think could be better. (colour grouping of elements, maybe some elements not getting coloured, collapsing/folding blocks, etc.)
There may be some room to add additional colours (not much though), but I'm also worried that too many different colours can turn things into a circus ;-)
Of course you can tweak the colours yourself too. Or fonts, sizes etc.
I'm sure you can figure that out if you want to. (else, ring a bell)