/usr/share/doc/xmlstarlet/examples/c14n2 is in xmlstarlet 1.3.0-1.
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The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
# XML exclusive canonicalization
./xmlstarlet c14n --exc-with-comments ../examples/xml/c14n.xml ../examples/xml/c14n.xpath
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