Kingsley,
The mappings are already in Wikidata (we still have a few properties
left to map, but the classes are done, except for a few in
pending.schema.org <http://pending.schema.org>. You can just query
them in some fashion such as this:
http://tinyurl.com/h9vjqd8
Thad,
Shouldn't the following query return all Classes participating in an
<https://www.wikidata.org/wiki/Property:P1709> relation? :
SELECT ?s ?relation ?o
WHERE { ?s <https://www.wikidata.org/wiki/Property:P1709> ?o.
BIND (<https://www.wikidata.org/wiki/Property:P1709> AS ?relation)
}
LIMIT 100
Query Link:
If not, can you formulate something closer to that output which makes
matters easier should you not have an RDF dump available etc..
Kingsley
On Sun, Oct 9, 2016 at 11:09 AM Kingsley Idehen
<kidehen(a)openlinksw.com <mailto:kidehen@openlinksw.com>> wrote:
On 10/8/16 5:04 PM, Thad Guidry wrote:
Class mappings are almost complete Kingsley. We were trying to
get Wikidata to the point where it is easy for folks to do
trivial queries right inside WDQS as part of WD Goals for 2016.
Thad,
Here is a post (brought up to date in last day) that demonstrates
owl:equivalentClass reasoning and inference. Once I have a link to
the new mappings I will integrate into this demo.
Note, this particular LOD Cloud Cache instance has 30 Billion+
triples against which the owl:equivalentClass inference is being
applied, at query evaluation time.
[1]
http://kidehen.blogspot.com/2014/02/class-equivalence-based-reasoning.html
Kingsley
On Sat, Oct 8, 2016, 2:38 PM Kingsley Idehen
<kidehen(a)openlinksw.com <mailto:kidehen@openlinksw.com>> wrote:
On 10/6/16 2:57 PM, Thad Guidry wrote:
Hello team :)
So while I'm helping with the Wikidata -
Schema.org
mappings, a request came in to expose subcategories of an
existing Wikipedia category.
For example, say I start with this
topic:
https://www.wikidata.org/wiki/Q27119725 Parking
facilities
The topic's main category is shown as "Category:Parking
facilities" and that has links to Wikipedia, specifically a
Wikipedia category link, and where the WP category page has
subcategories that I would like to expose somehow in
whichever way is *easiest* currently with our tools, apis, etc.
Can it all be done in SPARQL against some services that
already expose WP subcategories given a specific category ?
Or is there an API that does this already ? other tools
that might expose WP categories ?
The IDEAL GOAL is to query 'equivalent class' =
schema.org/ParkingFacility
<http://schema.org/ParkingFacility> and get back the WP
categories *in one shot or query or api call.*
http://schema.org/ParkingFacility
*
Parking facilities in India
<https://en.wikipedia.org/wiki/Category:Parking_facilities_in_India>
*
Parking facilities in the United States
<https://en.wikipedia.org/wiki/Category:Parking_facilities_in_the_United_States>
*
Aircraft hangars
<https://en.wikipedia.org/wiki/Category:Aircraft_hangars>
*
Garages (parking)
<https://en.wikipedia.org/wiki/Category:Garages_%28parking%29>
*
Railway depots
<https://en.wikipedia.org/wiki/Category:Railway_depots>
Any gurus ?
Hi Thad,
If there are owl:equivalentClass mappings in some Linked Data
Space, and the SPARQL service associated with said Data Space
supports owl:equivalentClass reasoning, then the answer to
your question is yes.
What unknown right now is the class mappings between Wikidata
and
Schema.org. If a dump of those exist, the rest is trivial :)
--
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