>>Naomi, just to make sure I understood correctly: you're looking for a way to prettify an XML document?
>
>I want to be able to see it not as huge big chunk of data, but normally with the tree structure (and have an ability to change something when looking at it this way).
>
>Also, files may be huge (~900KB or more)

Try mitec xml viewer:
https://www.mitec.cz/xmlv.html