This discussion is enlightening.

At the very least, even if not ideal, you should be able to do:

xmllint --xpath "//*[local-name()='product_version']/*[local-name()='name']/text()" 

This discussion is enlightening.

At the very least, even if not ideal, you should be able to do:

xmllint --xpath "//*[local-name()='product_version']/*[local-name()='name']/text()" file.xml 

Or use xmlstarlet instead:

xmlstarlet sel -t -v //swid:product_version/swid:name file.xml