Heard from AR that he's now integrated support for the Lucene SnowballAnalyzer into eXist trunk, so I built a WAR from SVN to test this with. I've added lucene-snowball-2.9.2.jar (to match the Lucene version in trunk) to WEB-INF/lib, and I'm going to start investigating both this and the way controller.xql works, ahead of porting Map of London to the latest eXist.