[Developers] Question about references to wikipedia articles

[Kavitha Srinivas]

Yes, that's a good suggestion.  The trouble is, as you pointed out,  
even the redirects don't always match, because of the differences in  
the update cycles.  Thanks for the information about the Freebase  
Wikipedia Extraction.  That looks like it may help us start  
establishing connections between dbpedia and freebase.
Kavitha

On Feb 19, 2008, at 8:45 PM, Colin Evans wrote:

> Hi Kavitha,
> Every Freebase topic that has a corresponding Wikipedia topic has a  
> set
> of keys with the namespace "/wikipedia/en" and also a "/wikipedia/ 
> en_id"
> key.  You can see examples of those keys here:
> http://freebase.com/view/explore/topic/en/abraham_lincoln
>
> The "en" keys are the Wikipedia article titles and redirects that
> correspond to the Freebase topic.  The "en_id" is the Wikipedia  
> page_id
> from the Mediawiki database.
>
> We re-synchronize with Wikipedia roughly twice a month, with a strong
> emphasis on keeping Freebase topics stable.  Thus, if a page is split,
> merged, moved, or deleted in Wikipedia, the corresponding topic(s) in
> Freebase will reflect the changes conservatively or maybe not at all,
> depending on the data and our current sync algorithm.  We work hard to
> keep Freebase.com aligned with Wikipedia, so for most cases the "en"
> keys should be a good mapping.
>
> The dbpedia extraction is run on a regular basis from scratch, and
> therefore their canonical reference is to a specific article  
> version in
> a specific Wikipedia dump.  Because Freebase.com is continuously
> synchronizing with Wikipedia, there isn't a more canonical reference
> than the "en" and "en_id" keys.
>
> If you're looking to reconcile a specific dbpedia dump with
> Freebase.com, I'd recommend aligning on article names and redirects --
> the "en" keys in Freebase.  There may be some inconsistencies as
> Wikiepdia redirects move around over time, but this will probably work
> for the majority of records.
>
> Also, I'd like to get in a plug for the new Freebase Wikipedia
> Extraction, which is the basis for a lot of our sync algorithms and  
> data
> mining of Wikipdia.  The "freebase_names" table has a mapping of
> Freebase guids to Wikipedia article names, which should make alignment
> easier: http://download.freebase.com/wex/doc/#freebase_names
>
> Hope that helps!
> -Colin
>
> Kavitha Srinivas wrote:
>> Is there a way to get a canonical reference to the current version of
>> the wikipedia article for a given guid in freebase?  We are trying to
>> establish connections between freebase and dbpedia, and it looks like
>> dbpedia has a canonical reference, whereas freebase uses a link to
>> the version from which it was created.  Finding equivalences between
>> dbpedia and freebase has not been easy, and is prone to errors.   
>> Thanks!
>> Kavitha
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