prep for subtree
Squashed 'assets/xml/' content from commit f953012

git-subtree-dir: assets/xml
git-subtree-split: f953012457f57e0c8ebdee6c2bba499eb0a5d30a
Merge commit '356cd1121246d6937e49e49c7c5c274823788da3' as 'assets/xml'
xml backend changes, 4.5.5