/usr/share/check-all-the-things/data/xml is in check-all-the-things 2015.12.10ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | [xmllint]
apt = libxml2-utils
match = *.xml
command = xmllint --noout --nonet {files}
# vim:ft=dosini
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