Standalone stylesheet for stripping namespaces from DocBook 5/NG

Standalone stylesheet for stripping namespaces from DocBook 5/NG
docs. You currently need to do two-pass processing to use this:
First, transform your DocBook 5/NG source doc using this, then
transform the result as usual with the manpages/docbook.xsl
stylesheet. Of course you can always run the process using a pipe
if you want. Example:

  xsltproc ./manpages/stripns.xsl myRefEntry.xml \
    | xsltproc ./manpages/docbook.xsl

It may be that there is actually some way to set it up as a
single-pass XSLT process, as is done with the HTML stylesheets.
But I've not yet figured out how to get that to work...