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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