These files are from DocBook testdocs revision 8591.

https://docbook.svn.sourceforge.net/svnroot/docbook/trunk/testdocs/tests

The 5.0 tests are not included.

If you update the files to a newer version of testdocs, change this file to
reflect the change.  If you make a change to one of these files, note that
change in this file so that change can be preserved when upgrading to newer
versions of testdocs.

These files are not found in testdocs:
classsynopsis.x001.xml
funcsynopsis.x001.xml
inline.x001.xml
simplelist.x001.xml
table.x001.xml

The title of epigraph.001 was changed from article.001 to epigraph.001