/usr/share/doc/xmlstarlet/examples/sel1 is in xmlstarlet 1.5.0-1.
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
# xsl:copy-of in xml sel command
./xmlstarlet sel -B -t -e ROOT -m /xml/table/rec -c . -n xml/table.xml | ./xmlstarlet c14n
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