Hi Ed. In addition to the API(s), there's a specific Freebase<->Wikidata
mapping dump which is a little old (18 months), but very compact and easy
to work with. The identifiers are likely to be pretty stable, so if the
entities you are interested in have been around for a while, it might be
easier to work with.
https://developers.google.com/freebase/data#freebase-wikidata-mappings
The three hits for your sample topic make me suspicious about the quality
of the mapping though
$ curl
http://storage.googleapis.com/freebase-public/fb2w.nt.gz | zgrep
'm.04hcw'
<http://rdf.freebase.com/ns/m.04hcw> <
http://www.w3.org/2002/07/owl#sameAs> <http://www.wikidata.org/entity/Q9391>
.
<http://rdf.freebase.com/ns/m.04hcw4> <
http://www.w3.org/2002/07/owl#sameAs> <
http://www.wikidata.org/entity/Q1579293> .
<http://rdf.freebase.com/ns/m.04hcwh> <
http://www.w3.org/2002/07/owl#sameAs> <
http://www.wikidata.org/entity/Q1347932> .
I don't know if this dump was used as the basis for the identifiers loaded
into Wikidata, but you might want to consider building in some safeguards
like double checking that names match -- whatever lookup scheme you decide
to use.
Tom
On Sun, May 17, 2015 at 10:23 AM, Ed Summers <ehs(a)pobox.com> wrote:
Hi all,
I was wondering if anyone had any advice for mapping a set of Freebase
identifiers to WikiData identifiers. I’m looking to port over a few
thousand entities in use in an application since Freebase is going to be
shut off next month.
My apologies if this is a rudimentary question. I took a quick look at the
API [1] and didn’t see an obvious way of doing it. Or is the WikiData Query
API [2] a better fit for this? I was able to figure out how to do a lookup
based on the FreebaseID,
https://wdq.wmflabs.org/api?q=string[646:'/m/04hcw']
Any tips or pointers would be appreciated.
//Ed
[1]
https://www.wikidata.org/w/api.php
[2]
https://wdq.wmflabs.org/api_documentation.html
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