Fixed a huge number of errors in the source XML, and added some pre-processing to fix many of them. Set up three levels of validation for the incoming XML and the generated XML as part of the build process, and then started hacking away at the remaining errors in the HTML output. What's left, as far as I can see, is just the problem of milestone elements showing up as direct children of e.g. list elements. That's on the table to be fixed next week.