/usr/share/doc/docbook-simple/examples/test-si-1.0.xml is in docbook-simple 1.1-4.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | <?xml version='1.0'?>
<!DOCTYPE article SYSTEM "/usr/share/xml/docbook/custom/simple/1.0/sdocbook.dtd">
<article>
<title>foo</title>
<section>
<title>bar</title>
<para>foo</para>
</section>
</article>
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