On 5 March 2016 at 16:15, Markus Krötzsch markus@semantic-mediawiki.org wrote:
I agree with Egon that the uniqueness requirement is rather weird. What it means is that a thing is only considered an "identifier" if it points to a database that uses a similar granularity for modelling the world as Wikidata. If the external database is more fine-grained than Wikidata (several ids for one item), then it is not a valid "identifier", according to the uniqueness idea.
Then we should create a Wikidata item for each concept on that external database.