Hoi,
Markus with all due respect, we have a LOT of data in Wikidata that is plain wrong. When we add the missing data from DBpedia it is of a higher quality than what we have. Insisting that it first needs to be validated is foolish. It is not done for any of the work we do. All our bots make use of Wikipedia and in this DBpedia is no different.

I do agree that it makes sense to verify the data that is different. But even so. When Wikidata says 1929 and DBpedia says 7-June-1929 our practise has been to remove the 1929 for the more precise data.

Let us be pragmatic and improve our data and start with what is missing.
Thanks,
    GerardM

On 4 June 2015 at 10:31, Markus Krötzsch <markus@semantic-mediawiki.org> wrote:
Hi Dmitris,

Interesting situation. If you have contradictory data from several templates, then the challenge will be to find out which information is correct for importing it to Wikidata. Could your dataset maybe become an input to the primary sources tool [1]? Then Wikidata users could help to clean the dataset and try to find references (as you know, references are quite important for Wikidata, but it would really be asking too much of DBpedia to provide these).

This could be a viable strategy to merge DBpedia data into Wikidata. This email was only about person-related data, but one could do this for any kind of dataset where the information in DBpedia is of relatively high quality. I don't know exactly what the primary sources tool needs as input (it is still beta), but I think it mainly requires that a decent quality set of candidate statements is extracted and provided in some suitable format.

As a first step, it might make sense to do a scan to see how many date-of-death (or whatever) statements in DBpedia are not yet found in Wikidata. If it is a small dataset (e.g., only a subset of the people who have died in the last year), then maybe one could also add and verify it in another way, not going through primary sources. But especially for recent deaths, there might be a great variety of sources (esp. newspaper articles) that are not easy to find without user support.

Regards,

Markus

[1] https://www.wikidata.org/wiki/Wikidata:Primary_sources_tool



On 04.06.2015 09:56, Dimitris Kontokostas wrote:


On Thu, Jun 4, 2015 at 1:18 AM, Markus Krötzsch
 <markus@semantic-mediawiki.org <mailto:markus@semantic-mediawiki.org>>

wrote:

    On 03.06.2015 22:44, Gerard Meijssen wrote:

        Hoi,
        The Dutch indicated their willingness to add the dead to
        Wikidata ... I
        add quite a few dead from other countries and because of Jura1
        Brazilians who died in 2015 have an added significance.

        Given that we CAN produce lists like this, it makes sense to
        reconsider
        the offer by the fine people from DBpedia and have the
        information they
        harvest from Wikipedia added automatically to Wikidata.. One
        reason I
        pointed out on my recent blogpost..


    DBpedia is getting this information from the contents of the
    template Persondata as used on Wikipedia [1]. The enwiki community
    just recently decided to maintain this data on Wikidata instead. I
    guess this means that (English) DBpedia will not contain this data
    in the future, unless they import it from Wikidata (they are
    tracking the issue at [2]).


Note that DBpedia gets person data information both from the persondata
template and from the infobox templates using the mappings wiki.
We also noted that the data between the two is many times out of sync
(and usually the person data is stalled/wrong because people don't know
it's existence).

e.g. we have 28K items with double birth dates one from the infobox and
another from persondata.

select count(*) where {?s dbpedia-owl:birthDate ?b1 ;
dbpedia-owl:birthDate ?b2 .
filter (?b1 != ?b2 && ?b1 < ?b2)}
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=select+count%28*%29+where+%7B%3Fs+dbpedia-owl%3AbirthDate+%3Fb1+%3B+dbpedia-owl%3AbirthDate+%3Fb2+.%0D%0Afilter+%28%3Fb1+%21%3D+%3Fb2+%26%26+%3Fb1+%3C+%3Fb2%29%7D&format=text%2Fhtml&timeout=30000&debug=on

The persondata template is used in German Wikipedia as well. The
following release has ~ 2.2M triples coming from the german persondata
template (which iirc has the same problems as the english)

Best,
Dimitris


    So you see, times are changing quickly ... but overall I hope that
    this is still solving the problem you identified, in fact in a much
    more direct way than one might have hoped for :-).

    DBpedia may still play a role. I don't know how exactly the enwiki
    community is planning to implement the move from Persondata to
    Wikidata. It could be that DBpedia is the only project extracting
    this data. So in a way, your suggestion might be a great idea,
    though not as a long-term data maintenance plan but as a one-time
    help for migration.

    To support data maintenance further, it would make sense to use bots
    for synching with authority files. These files also contain death
    dates and they can even be used as a valid reference.

    Regards,

    Markus

    [1] https://en.wikipedia.org/wiki/Template:Persondata
    [2] https://github.com/dbpedia/extraction-framework/issues/397

        Thanks,
                 GerardM

        http://ultimategerardm.blogspot.nl/2015/06/wikidata-jurandyr-noronha-died-in-2015.html

        On 3 June 2015 at 07:16, Gerard Meijssen
        <gerard.meijssen@gmail.com <mailto:gerard.meijssen@gmail.com>
        <mailto:gerard.meijssen@gmail.com

        <mailto:gerard.meijssen@gmail.com>>> wrote:

             Hoi,
             Jura1 created a wonderful list of people who died in Brazil
        in 2015
             [1]. It is  a page that may update regularly from Wikidata
        thanks to
             the ListeriaBot. Obviously, there may be a few more because
        I am
             falling ever more behind with my quest for registering
        deaths in 2015.

             I have copied his work and created a page for people who
        died in the
             Netherlands in 2015 [2]. It is trivially easy to do this
        and, the
             result is great. The result looks great, it can be used for any
             country in any Wikipedia

             The Dutch Wikipedia indicated that they nowadays maintain
        important
             metadata at Wikidata. I am really happy that we can
        showcase their
             work. It is important work because as someone reminded me
        at some
             stage, this is part of what amounts to the policy of living
        people...

             Thanks,
                    GerardM

             [1]
        https://www.wikidata.org/wiki/User:Jura1/Recent_deaths_in_Brazil
             [2]
        https://www.wikidata.org/wiki/User:Jura1/Recent_deaths_in_the_Netherlands




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Kontokostas Dimitris


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