@Clive, very good information.
You can do things the Modern Cool Nerd Way by creating an account on github.com, forking xtuml/models, cloning and submitting a pull request (PR). Or you can do things the Practical Way and email a zip file to me or someone on the BridgePoint team. :)
For that and for direct communication regarding a model compiler expert, send an email to cortland.starrett [at] onefact.net.