C
XSLT transformations in Python through the Gnome libxml C parser
This is an example script on how to do XSLT transformations in Python 2.6 through the Gnome libxml XML C parser and toolkit. The relative fast C library is available on multiple platforms but you will also need Python bindings for libxml2 and libxslt. There is a handy libxml2 and libxslt Python bindings installer for Windows which also includes the C libraries in DLL form.