/usr/share/doc/prover9-doc/examples/x2.xml is in prover9-doc 0.0.200902a-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!DOCTYPE interps SYSTEM "interp3.dtd">
<?xml-stylesheet type="text/xsl" href="interp3.xsl"?>
<interps>
<source>x2.mace4.out</source>
<heading><![CDATA[
Mace4 (32) version 2009-02A, February 2009.
Process 15847 was started by mccune on cleo,
Wed Feb 25 12:26:19 2009
The command was "/home/mccune/bin/mace4 -c -f x2.in".
]]></heading>
<input><![CDATA[
formulas(sos).
(x * y) * z = x * (y * z).
x * e = x.
x * x' = e.
end_of_list.
formulas(goals).
x * y = y * x.
end_of_list.
]]></input>
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