I've rewritten my odd file generation and schema generation code so that it can use an optional external file containing a particDesc to create the values for sp/@who. This basically works, except that the ant build fails at the point where it's supposed to be generating the RNG files. I can't figure this problem out yet; it seems to be something to do with the new Oxygen 17 and the current build of the Oxygen plugin (at least, it worked before installing 17, and nothing seems to have changed in the relevant bit of my build file). Still working on it.