Hoi,
The biggest casualty of the current mess is that people like me do not care
at all about it. It cannot be explained, nobody is interested in explaining
it and consequently there is little use for it. It is "must have" so it is
there.. fine, lets move on.
Thanks,
GerardM
On 7 January 2017 at 10:39, Markus Kroetzsch <markus.kroetz...@tu-dresden.de
> wrote:
>
>
> On 06.01.2017 18:24, Thomas Douillard wrote:
>
>> Same entity can be treated both as class and individual
>>>
>>
>> This is valid for OWL as well.
>>
>
> Yes, and since Wikidata does not feature very powerful ontological
> statements, you could treat this like in OWL 2 DL semantically as well,
> i.e., a weak approach where the "class" and the "instance" are not really
> identified works.
>
> Nevertheless, using the ontology might still be challenging depending on
> what you want to do with it, since there are quite a few meta-levels
> (classes of classes of classes ...) that are not cleanly separated. When I
> last checked, we even had some instance-of cycles ;-) Even this is not a
> technical problem for the OWL semantics, but maybe for some tools and
> approaches.
>
> Cheers,
>
> Markus
>
>
>> 2017-01-05 22:21 GMT+01:00 Stas Malyshev <smalys...@wikimedia.org
>> <mailto:smalys...@wikimedia.org>>:
>>
>> Hi!
>>
>> > The best you can get in terms of "downloading the wikidata
>> ontology" would be to
>> > download all properties and all the items representing classes. We
>> currently
>> > don't have a separate dump for these. Also, do not expect this to
>> be a concise
>> > or consistent model that can be used for reasoning. You are bound
>> to find
>> > contradictions and lose ends.
>>
>> Also, Wikidata Toolkit (https://github.com/Wikidata/Wikidata-Toolkit
>> <https://github.com/Wikidata/Wikidata-Toolkit>)
>> can be used to generate something like taxonomy - see e.g.
>> http://tools.wmflabs.org/wikidata-exports/rdf/exports/201608
>> 01/dump_download.html
>> <http://tools.wmflabs.org/wikidata-exports/rdf/exports/20160
>> 801/dump_download.html>
>>
>> But one has to be careful with it as Wikidata may not (and frequently
>> does not) follow assumptions that are true for proper OWL models -
>> there
>> are no limits on what can be considered a class, a subclass, an
>> instance, etc. Same entity can be treated both as class and
>> individual,
>> and there may be some weird structures, including even outright errors
>> such as cycles in subclass graph, etc. And, of course, it changes all
>> the time :)
>>
>> --
>> Stas Malyshev
>> smalys...@wikimedia.org <mailto:smalys...@wikimedia.org>
>>
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>>
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>>
>>
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