Markus, is this related with the idea of creating a
database of
automatically inferred statements that you presented some time ago?
I guess it is related, yes. Although currently I am first focussing on
efficient query answering -- inference will come after that :-) Whether
one stores the results in a database or not is an implementation detail,
btw., that is maybe not essential for a user.
Oh, and of course all of this seems to be rather off-topic for the
current subject "Commons Wikibase" :-) All that is relevant there has
already been said I guess ("many categories could be expressed by
queries to improve results; a gentle, community-led transition will be
possible and preferred; categories won't be switched off just because
Wikidata is switched on").
Cheers,
Markus
Cheers,
Micru
On Tue, Aug 19, 2014 at 12:30 PM, Markus Krötzsch
<markus(a)semantic-mediawiki.org <mailto:markus@semantic-mediawiki.org>>
wrote:
On 19.08.2014 12:20, Gerard Meijssen wrote:
Hoi,
I cannot parse this ..
What Thomas is saying is that classification (putting things into
"categories") and querying (finding things based on certain
properties) can be combined in a natural way. In ontology languages
like OWL, you can make statements that say, roughly speaking, that
"all results of query A belong to class B". This allows you to build
a classification partly automatically, and to ensure that your
classification is always consistent with your data.
From this perspective, you can view Wikidata's
stored queries as
similar to OWL's class expressions in that they allow you
to define
classes based on the data given for each item, without having to go
through all the items to add classes manually. What Thomas is
referring to is of course slightly more advanced still, but maybe
this clarifies part of the idea.
Cheers,
Markus
On 19 August 2014 11:43, Thomas Douillard
<thomas.douillard(a)gmail.com <mailto:thomas.douillard@gmail.com>
<mailto:thomas.douillard@__gmail.com
<mailto:thomas.douillard@gmail.com>>> wrote:
Note that in Wikidata we are developping methods and tools
to class
items in « classes », which in short are sets of real world
things
or events. In languages like the w3c language and standards
OWL2
<https://en.wikipedia.org/__wiki/OWL2
<https://en.wikipedia.org/wiki/OWL2>>. In this language you can
assign a class to an element (a media in the common case)
to a class
(that can be seen as a better defined category) either by
creating a
statement « this media belongs to that category » (in
Wikidata this
is done by using the « instance of » property
<https://www.wikidata.org/__wiki/Property:P31
<https://www.wikidata.org/wiki/Property:P31>>) or by associating
a so
called «class expression» in OWL (an analog of a query but more
powerful) Then in OWL any item who satisfy the criteria of
the query
or class expression associated to a class belongs to that class
without stating it explicitely. In short, the possibility
to assign
an arbitrary class to an item when a query is not enough
will also
be possible with just a metadata repository, we may in the
future
even be able to mix these two ways to class medias.
2014-08-19 10:14 GMT+02:00 James Heald <j.heald(a)ucl.ac.uk
<mailto:j.heald@ucl.ac.uk>
<mailto:j.heald@ucl.ac.uk <mailto:j.heald@ucl.ac.uk>>>:
Also there might be queries one might want to run on the
categories, which would be another reason to include
them in
Commons Wikibase.
-- J.
On 19/08/2014 07:00, Gerard Meijssen wrote:
Hoi,
I know the categories in Commons exist. I also know
that you
do not have to
add categories when an image is uploaded. Many
people do not
consider the
categories because they are just there and are not
easy nor
obvious without
a long study.
They are there and they evolve. When the
"community" finds
that they are no
longer useful, there will be others who still want
to work
on it. They can,
it is a harmless occupation. Why would we consider
removing
category
structures as long as someone cares about them ??
Thanks,
GerardM
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