/usr/bin/checkXML is in kdelibs5-dev 4:4.8.5-0ubuntu0.6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #! /bin/sh
prefix=/usr
exec_prefix=/usr/bin
exit `/usr/bin/meinproc4 --check --stdout $@ > /dev/null`
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