On 11/11/2010 12:32 PM, Kingsley Idehen wrote:
Tom,
Where are the RDF format dumps from Freebase? If they aren't delivering
RDF dumps, of what value are these dumps to someone working with Linked
Data? Note, I don't think people are expecting to make translations when
the initial goal was to reconcile companies leveraging common data
representation.
Hopefully, you will prove me wrong and unveil their RDF dumps.
Note, I've requested these dumps repeatedly from freebase (pre
acquisition) and basically stopped asking.
I believe the content of rdf.freebase.com can be generated by a
very simple algorithm from the quad dump. I think it would be less than
a week of work to code something up that downloads the quad dump,
transforms it into triples, and outputs a big NT file. I'm not going
to do it unless somebody pushes a few G's my way because I don't need it
-- I can get exactly what I want out of the core dump in the format I
need already.
That said, I don't like the Freebase RDF mappings because they
stick too close to the structure of the quad dump, therefore
introducing tons of blank nodes. For instance, if you take a look at
http://rdf.freebase.com/rdf/en.michael_cera
You'll find this silly blank node
<http://rdf.freebase.com/ns/en.michael_cera>
<http://rdf.freebase.com/ns/type.object.key> _:rdNoDsEC11104 .
_:rdNoDsEC11104<http://rdf.freebase.com/ns/type.key.namespace>
<http://rdf.freebase.com/ns/authority.tvrage.person> .
_:rdNoDsEC11104<http://rdf.freebase.com/ns/type.value.value> "13091" .
Seems to me that this could be attacked with some kind of URL mangling, like
<fb:ns/en.michael_cera> <fb:ns/type.object.key>
<fb:ns/authority.tvrage.person/13091> .
----
More fundamentally, the Freebase dumps don't use standard vocabularies.
For instance, in the care of Mr. Cera, we could make quite a few FOAF and DC
assertions. Similarly, the Freebase schema could be (largely) expressed in
OWL.
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