In the documentation I couldn't find any information on when the *.xml files with user-defined types are actually loaded. If I didn't oversee this it would be nice to have this documented somewhere, possibly even printed out to debug output in VS. If this is unknown it's hard to know when a change will apply once the *.xml file was changed. Does it apply immediately? After restarting the debug session? After restarting VS? After rebooting the OS?