[Developers] Freebase data sources

[Kurt Bollacker]

On Thu, May 15, 2008 at 09:14:22PM +0530, Zodiac Seven wrote:
> Thanks Kurt,
> 
> Can you tell me how it relates the data sources to entity types, Is there
> some sort of mapping table? actors-> imdb, anything else: wikipedia. I mean
> how does it decide when to use wikipedia and when to use imdb. Is this
> documented somewhere?

We usually get instances of more than one type from a single source.
For example, we've gotten hundreds from Wikipedia, and at least half a
dozen from MusicBrainz.  There is no simple mapping table.  Provenance
information sometimes can be gleaned from the creator of a
topic/property, and perusing the list of Mass Data Operations at:

http://www.freebase.com/view/dataworld/mass_data_operation

We have recently redesigned our representation of provenance
information and you should see more evidence of it in the coming
months.

Also, for the record, we have not included any information directly
from IMDB, as their license is not compatible with CC-A. However, we
have extracted IMDB keys from Wikipedia (and possibly other license
compatible) sources, and our users may have entered URLs by hand.

								Kurt :-)

> On 5/15/08, Kurt Bollacker <kurt at metaweb.com> wrote:
> >
> >
> > On Thu, May 15, 2008 at 07:27:16PM +0530, Zodiac Seven wrote:
> > > Does freebase always get it's data from wikipedia?
> > >
> > > I notice that I see relevant links to other sources like - for actors
> > there
> > > is an imdb entry. Is there a list of all possible data sources which I
> > could
> > > use for my mashup?
> >
> >
> > To answer your first question:
> >
> > A list of (at least some of) the information sources used in, or at
> > least considered for Freebase can be found as instances of our
> > "Information Source" type:
> >
> > http://www.freebase.com/view/dataworld/information_source
> >
> > This is a type for real world entities rather than strictly a list of
> > websites with "mashupable" APIs.  Also, we don't include data in
> > Freebase from sources for which there is an incompatible license.
> >
> > I'm not sure if this answers your question.  However, it'd be great if
> > you wanted to create a "Web mashup info source" type and fill it in
> > with instances that you find.
> >
> >
> >
> >                                                                 Kurt :-)
> >
> >
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> > Developers at freebase.com
> > http://lists.freebase.com/mailman/listinfo/developers
> >

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