/usr/share/doc/xmlstarlet/examples/dtd2 is in xmlstarlet 1.6.1-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
# Validate XML document against DTD
./xmlstarlet val --dtd dtd/table.dtd xml/table.xml >/dev/null 2>&1; echo $?
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