Re: [Dbpedia-discussion] [Dbpedia-developers] Mapping Wikidata properties to DBpedia ones

Kingsley Idehen Fri, 30 Aug 2013 16:05:31 -0700

On 8/30/13 12:25 PM, Dimitris Kontokostas wrote:

Thanks Kingsley,
for now we don't host the data so wikidata.dbpedia.org/resource/ <http://wikidata.dbpedia.org/resource/>.. does not dereference anything
lets take an example to recup
Q42 (Douglas Adams), besides the answer to the ultimate question [1] :) has the following triple http://www.wikidata.org/entity/Q42 http://www.wikidata.org/entity/P107 http://www.wikidata.org/entity/Q215627
which in our dump *will* be translated to
http://wikidata.dbpedia.org/resource/Q42 owl:sameAs http://www.wikidata.org/entity/Q42
http://wikidata.dbpedia.org/resource/Q42 rdf:type dbpedia-owl:Person
If I get it right, your suggestion is to generate this triple directly right?
http://www.wikidata.org/entity/Q42 rdf:type dbpedia-owl:Person
but in this case, when someone opens Q42 he/she will not see out added triples

Having taken a closer look at the RDF content in WikiData documents It should be:

<http://www.wikidata.org/entity/Q42> foaf:primartyTopic <http://dbpedia.org/resource/Douglas_Adams> .

To be really safe, i.e., not vulnerable to changes relating to how they evolve handling of entity disambiguation via content negotiation etc., you can opt to be much more specific about the RDF document URLs:

<http://www.wikidata.org/entity/Q42.nt> foaf:primaryTopic <http://dbpedia.org/resource/Douglas_Adams> . http://www.wikidata.org/entity/Q42.rdf> foaf:primaryTopic <http://dbpedia.org/resource/Douglas_Adams> .


That's it, let the Web of Linked Data do the rest :-)


Kingsley.


Cheers,
Dimitris

[1] http://en.wikipedia.org/wiki/42_%28number%29#The_Hitchhiker.27s_Guide_to_the_Galaxy

On Fri, Aug 30, 2013 at 5:57 PM, Kingsley Idehen <kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:


    On 8/29/13 2:45 PM, Hady elsahar wrote:


    i guess what we need now is to map between the original WikiData
    URIs and their URIs we use in DBpedia under the new namespace ,
    for example :

    <http://wikidata.dbpedia.org/resource/Q1293045> owl:sameAs
    <http://wikidata.org/entity/Q1293045>

    No.

    As per my last two mails. You are making unnecessary work here.
    Wikidata is publishing RDF based Linked Data. Thus, simply use
    their URIs.

    Example of the implications of your current approach:

    curl -ILH "Accept: text/turtle"
    http://wikidata.dbpedia.org/resource/Q1293045
    curl: (6) Couldn't resolve host 'wikidata.dbpedia.org
    <http://wikidata.dbpedia.org>'


    Just map the WikiData URI to the DBpedia URI and you leverage the
    benefits of:


    curl -ILH "Accept: text/turtle" http://wikidata.org/entity/Q1293045
    HTTP/1.0 301 Moved Permanently
    Date: Fri, 30 Aug 2013 14:51:49 GMT
    Server: Apache
    *Location: http://www.wikidata.org/entity/Q1293045*
    *Content-Type: text/html*; charset=iso-8859-1


    HTTP/1.0 302 Moved Temporarily
    Date: Fri, 30 Aug 2013 14:51:49 GMT
    Server: Apache
    *Location: https://www.wikidata.org/wiki/Special:EntityData/Q1293045*
    *Content-Type: text/html*; charset=iso-8859-1


    HTTP/1.1 303 See Other
    Server: nginx/1.1.19
    Date: Fri, 30 Aug 2013 14:51:54 GMT
    *Content-Type: text/html*; charset=utf-8
    Connection: close
    X-Content-Type-Options: nosniff
    Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
    Vary: Accept-Encoding,X-Forwarded-Proto,Cookie
    Expires: Thu, 01 Jan 1970 00:00:00 GMT
    Last-Modified: Fri, 30 Aug 2013 14:51:54 GMT
    *Location:
    https://www.wikidata.org/wiki/Special:EntityData/Q1293045.ttl*


    HTTP/1.1 200 OK
    Server: nginx/1.1.19
    Date: Fri, 30 Aug 2013 14:51:55 GMT
    *Content-Type: text/turtle*; charset=UTF-8
    Content-Length: 8388

    Regards,

    Kingsley Idehen     
    Founder & CEO
    OpenLink Software
    Company Web:http://www.openlinksw.com
    Personal Weblog:http://www.openlinksw.com/blog/~kidehen  
<http://www.openlinksw.com/blog/%7Ekidehen>
    Twitter/Identi.ca handle: @kidehen
    Google+ Profile:https://plus.google.com/112399767740508618350/about
    LinkedIn Profile:http://www.linkedin.com/in/kidehen





    
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--
Kontokostas Dimitris



--

Regards,

Kingsley Idehen 
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca handle: @kidehen
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Re: [Dbpedia-discussion] [Dbpedia-developers] Mapping Wikidata properties to DBpedia ones

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