Hi!

Yes, such matching are useful. The goal here is to move data from Freebase to Wikidata. So, we don't need 1-1 relation because the direction Wikidata to Freebase is not important. What we want here is that, if we replace the Freebase property by the Wikidata one, the relation remains valid.

So, P585 is a good matching for https://www.freebase.com/award/ranking/year because if we have "X award/ranking/year 1966" in Freebase then "X P585 1966" is valid too.

Cheers,

Thomas

On Mon, Jun 15, 2015 at 9:26 PM, Stas Malyshev <smalyshev@wikimedia.org> wrote:

Hi!

> As you may already know, I am currently working on the importation of
> Freebase content into Wikidata [1] using the primary source tool [2].
>
> One of the big challenges of the migration is to build a good mapping of
> the properties of Freebase to Wikidata ones.There are a few thousand of
> properties so it is a task too big to be done alone. Your help is far
> more than welcome for this task on this
> page: https://www.wikidata.org/wiki/Wikidata:WikiProject_Freebase/Mapping

Some of these look a bit challenging due to different semantics. I.e.
https://www.freebase.com/award/ranking/year probably matches point in
time (P585) but the former is for specific awards, while the latter is a
generic property that would be applied to the award claim. So it's not
1-1 transition. Would it still be useful to match P585 to
https://www.freebase.com/award/ranking/year and do the same in similar
cases? I.e. pretty much all /year ones would be P585, but in different
context.

--
Stas Malyshev
smalyshev@wikimedia.org

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