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?)
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