Kingsley,
use shortcut syntax instead. Also look at how the many examples show
doing tihngs.
http://tinyurl.com/hkv8z7m
Thad,
Not getting the point you are trying to articulate i.e., the solution
isn't comprised strictly of
<https://www.wikidata.org/wiki/Property:P1709>
<https://www.wikidata.org/wiki/Property:P1709> relations.
I am assuming <https://www.wikidata.org/wiki/Property:P1709>
<https://www.wikidata.org/wiki/Property:P1709> identifies
equivalentClass relations i.e.,
<https://www.wikidata.org/wiki/Property:P1709>
<https://www.wikidata.org/wiki/Property:P1709> owl:equivalentProperty
owl:equivalentClass .
You should be able to articulate the equivalent of the following, using
SPARQL against Wikidata:
SELECT DISTINCT ?s ?relation ?o
WHERE { ?s owl:equivalentClass ?o.
BIND (owl:equivalentClass AS ?relation)
FILTER (isIRI(?s))
FILTER (isIRI(?o))
}
LIMIT 100
Live Solution Link:
On Mon, Oct 10, 2016 at 1:50 PM Kingsley Idehen
<kidehen(a)openlinksw.com <mailto:kidehen@openlinksw.com>> wrote:
On 10/9/16 1:34 PM, Thad Guidry wrote:
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>
<https://www.wikidata.org/wiki/Property:P1709> relation? :
SELECT ?s ?relation ?o
WHERE { ?s <https://www.wikidata.org/wiki/Property:P1709>
<https://www.wikidata.org/wiki/Property:P1709> ?o.
BIND (<https://www.wikidata.org/wiki/Property:P1709>
<https://www.wikidata.org/wiki/Property:P1709> AS ?relation)
}
LIMIT 100
Query Link:
https://query.wikidata.org/#%0A%0ASELECT%20%3Fs%20%3Frelation%20%3Fo%0AWHER…
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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