Hi Andra,

Yes, we'll want to have skos:closeMatch available....but also...

We need to help with long-tail domain support, and one way to do that is support more 'external' properties.  Wikidata doesn't have all the data in the world yet, or a full understanding of it...but many times external systems do.  So I'd like to see the 'classes' properties of Wikidata to also have 'external' support.

Please propose additionally, a 'external subclass' Wikidata property as well.

That should do for now.