On Thu, Jun 4, 2015 at 12:56 PM, Markus Krötzsch <markus@semantic-mediawiki.org> wrote:

On 04.06.2015 11:05, Dimitris Kontokostas wrote:

We are currently working on something that could be extended to be used
as a source of finding data conflicts / import.
I have to check if this can be integrated with the primary sources tool.
I hope we have something ready in the next couple of weeks and I'll get
back at this thread.

Great, this sounds like a plan. The work on the primary sources tool will take a few more months before it will really be ready for prime time. If this is too long, there might be more short-term solutions (such as a Wikidata game), but you'd have to ask the people running this in each case.

I'll show you what we can provide and you can suggest any options

Another question: can DBpedia extract references from Wikipedia articles too? If this would be possible, it might be feasible to guess and suggest a reference (or a list of references). Especially with things like date of death, one would expect that references have a publication date very close to (but strictly after) the event, which could narrow down the choices very much.

We don't extract them for now, although I think we could relatively easily. The problem in this case would be that we cannot associate references with facts. The DBpedia Information Extraction Framework is quite module and can be easily extended with new extractors but it is hard to make these extractors "talk to each other".

So we could easily get something like the following

dbp:A dbo:birthDate "..."

dbp:A dbo:deahthDate "..."

dbp:A dbo:reference dbp:r1 # and maybe " dbp:r1 ....something else" depending on the modeling

dbp:A dbo:reference dbp:r2

but not sure if this solves your problem

Cheers,

Dimitris

Cheers,

Markus

Best,
Dimitris

On Thu, Jun 4, 2015 at 11:49 AM, Gerard Meijssen
<gerard.meijssen@gmail.com <mailto:gerard.meijssen@gmail.com>> wrote:

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
<mailto: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 <tel:04.06.2015%2009>:56, Dimitris Kontokostas
wrote:

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

wrote:

On 03.06.2015 22 <tel:03.06.2015%2022>: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>>
<mailto: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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