Package: qtxmlpatterns5-dev-tools

"qtxmlpatterns5-dev-tools" package binaries on Debian:

/usr/lib/x86_64-linux-gnu/qt5/bin/xmlpatterns /usr/lib/x86_64-linux-gnu/qt5/bin/xmlpatternsvalidator

You may install this package on Debian with apt-get install qtxmlpatterns5-dev-tools