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(a)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(a)wikimedia.org
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