Oh boy.  I thought I had a few things figured out with Wikidata...until
I read through the Property Talk discussions for 


(with its mentions of Freebase mapping)

I've been adding a few bits of Schema.org mapping into Wikidata today, and stumbled upon a few things that made me rethink a few things...lolol.

How to state that a Wikidata Entity (not a Property) such as
place of birth https://www.wikidata.org/wiki/Q1322263 
is the same concept or idea as a Schema.org property http://schema.org/birthPlace ?

I thought I could use P2236 above... but then it seems its for WD Properties, not Entities (subjects) ?

SOLUTION ? Perhaps we could do a best practice of treating http://schema.org/birthPlace as an actual Identifier for the place of birth concept 

...while reserving the WD Property place of brith https://www.wikidata.org/wiki/Property:P19 to use equivalent property https://www.wikidata.org/wiki/Property:P1628 ?

TPT and Denny didn't leave enough notes in there for what to do about external mapping cases of external vocabularies that are also loosely considered as metadata dictionaries as well for the common web and developers, like Schema.org is.

Thoughts on the SOLUTION proposed ?