On 4 April 2015 at 10:20, Thomas Douillard thomas.douillard@gmail.com wrote:
I guess a class of properties ''external identifier definition property'' with isbn <instance of> external identifier prop could be useful as well.
The property for an ORCID iD (P 496), for example, is an instance of "Wikidata property for authority control for people" (Q19595382). That, in turn is a sub-class of "Wikidata property for authority control" (Q18614948)