xmlstarlet print selected dom xpath

xmlstarlet.exe sel -N 'kml=http://www.opengis.net/kml/2.2' -t -m /kml:xml -v kml:hmm simple.xml

File:

<?xml version="1.0" encoding="UTF-8"?>
<xml xmlns="http://www.opengis.net/kml/2.2">
        <hmm>rrr</hmm>
</xml>

Output:

rrr