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.
Thad +ThadGuidry https://www.google.com/+ThadGuidry