It's a little unfair on the XSLT stuff, since you're going from DBI to XML to String to XML to XSLT. I need to update XML::Generator::DBI to output SAX2 (which I'm doing right now), after which you'll be able to go direct from XML::Generator::DBI into XML::LibXML::SAX::Builder, and skip the string phase completely.

I may even run the tests to see how it fares for me. I'll reply here after I've made those updates!