/usr/share/doc/xmlstarlet/examples/bigxml-xsd 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 4 | #!/bin/sh
. ./bigxml
xmldoc '<b/>' | ./xmlstarlet val --xsd xsd/bigxml.xsd --err - \
2>&1 >/dev/null | ${SED:-sed} -n "$SEDLINUM_PROG"
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