I finally got around to releasing PXSL Tools on Hackage. The package contains pxslcc, a preprocessor that converts Parsimonious XML Shorthand Language into XML, and supporting documentation.
If you want to hack on the Haskell sources, I’ve put the project on GitHub, too. See the pxsl-tools project page to browse the code, or just clone the repo and hack away:
$ git clone git://github.com/tmoertel/pxsl-tools.git