I would also agree with this. In my opinion P2888 should only be used as a last resort.
If possible, it's usually a much better idea to use a specific external-id property for the external database -- it gives us better organisation, it's more obvious on the page, and it's much more efficient to query.
If you want to emphasise that the matched items are indeed supposed to have identical coverage and meaning at each end, use qualifier P4390 ("mapping relation type") with value Q39893449 ("exact match") on the external-id statement.
Best regards,
James.
On 22/09/2018 15:07, Ettore RIZZA wrote:
@Andra Waagmester: I am a little disconcerted by the property P2888 "exact match" https://www.wikidata.org/wiki/Property:P2888. I see it is mostly used to link entities, not properties, and I can't figure out how it differs from an external id (unless it's just a convenient way of linking concepts to databases that do not have an external id in Wikidata?)
--- This email has been checked for viruses by AVG. https://www.avg.com