This file is indexed.

/usr/share/cluster/relaxng/fence.rng.tail is in fence-agents 3.1.5-2ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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       <!-- end auto-generated device definitions -->

       <group>
        <optional>
         <empty/>
        </optional>
       </group>

       <!-- end specific fence devices -->
      </choice>
     </optional>
  </define>
<!-- end fence attribute group definitions -->