The next part of the plan to handle the Plans is to use the basic GeoJSON we now have in WGS84 to create BreezeMap-compatible GeoJSON with all the extra info we need in it. I decided to do this with XSLT3, to get familiar with the new JSON-handling functionality, and it seems pretty straightforward once you get the hang of it. I'm now producing all the output I need, but I haven't yet figured out how to create an index for these pages.