Here is a quick function for cleaning up XML without any line breaks. This is a quick and dirty solution with some minor issues (e.g. turning
<test>\n</test>), but the goal of this it not to be too accurate, but to quickly put a non-readable XML into a readable form for reference.
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function! PrettifyXML() set ft=xml :%s/></>\r</g :0 :norm =G endfunction
Put this in your vimrc file and call it using