/usr/share/doc/xmlstarlet/examples/exslt-ed is in xmlstarlet 1.6.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
# Use EXSLT functions
echo '<x/>' | ./xmlstarlet ed -O -u /x -x 'date:day-name("2011-09-24")'
echo '<x/>' | ./xmlstarlet ed -O -u /x -x 'math:abs(-1000)'
echo '<x><n>a</n><n>b</n><n>a</n></x>' | ./xmlstarlet ed -O -u /x -x 'count(set:distinct(/x/*))'
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