According to the resourcetype.cfg entry in the documentation, files like ore.cfg, wood.cfg etc don't have a realm in the definition.

Is this the case or an omission?

I noticed in the 097 distro, that wood.cfg does use a realm, but it's the only resource file that does.

its in core changes...

04-17 Racalac
Multimap/Realm Support

...

Regions:
Added "Realm realmname" property

Thanks. I knew about light.cfg, weather.cfg, and regions.cfg - didn't realise it also appled to the regions directory in general.