From the webpage:
XML Calabash is an implementation of XProc: An XML Pipeline Language.
See the XML Calabash project status page for more details.
You can download Calabash and/or read the (very little bit of) documentation. Calabash also ships with the
xml editor (as does Saxon-EE which includes support for validation with W3C XML Schema).
A new release of Calabash reminded me that I needed to update some of my XML tooling.
If you are looking for an opportunity to write documentation, this could be your lucky day! 😉