Hi, With the latest oXygen 14.0, I tried to use XSLTHL with DocBook. So I created a simple DocBook article using the built-in oXygen template. I added a programlisting with a language="xml" attribute. A complete example is: When I run the built-in DocBook to PDF scenario, I get an error. If I duplicate it and disable FOP processing (to keep just the XSL-FO as the output), I have something like the following: <fo:block ...> <http://xslthl.sf.net:tag xmlns:http://xslthl.sf.net="xslthl"><hello></http://xslthl.sf.net:tag>World!<http://xslthl.sf.net:tag xmlns:http://xslthl.sf.net="xslthl"></hello></http://xslthl.sf.net:tag> </fo:block> That is, it seems like at some point, the piece of code that is generating (or serializing?) the above element is mixing up the xslthl prefix and the URI "http://xslthl.sf.net". If you replace each of them by the other (prefix and URI), you get the following (I guess correct) element: <fo:block ...> <xslthl:tag xmlns:xslthl="http://xslthl.sf.net"><hello></xslthl:tag>World!<xslthl:tag xmlns:xslthl="http://xslthl.sf.net"></hello></xslthl:tag> </fo:block> I've tried to track it a bit further down using the debugger, but could not find anything more, really. Do you have any idea? Did I miss anything? Regards, -- Florent Georges http://fgeorges.org/ http://h2oconsulting.be/