/usr/share/doc/libvirt-doc/examples/xml/nwfilter/allow-ipv4.xml is in libvirt-doc 4.0.0-1ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <filter name='allow-ipv4' chain='ipv4'>
<rule direction='inout' action='accept'/>
</filter>
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