I tried to search, and I couldn't find any answers to this.
I am trying to add different strategic icons for different types of stars (giant, dwarf, etc). I can add an existing icon just by changing <StrategicIcon> in StarArtDefs.xml. I needed new ones, so I added a couple cells to GC3_Strategic_Icons.dds. The game balked because new icon names have to be cited in the schema. There is only one "custom" slot in the schema, so I added four new categories to the schema. The game will load, but it crashes when a new game is launched. Did I miss something?