Kingsley,
You might ask others on the list who could help more with providing the WD
-
mappings or get them into a format that you want...or an RDF
dump file.
I just don't have the knowledge to assist you with that via SPARQL. (i.e.,
I am not a SPARQL guru)
On Tue, Oct 11, 2016 at 1:11 PM Kingsley Idehen <kidehen(a)openlinksw.com>
wrote:
On 10/10/16 5:31 PM, Thad Guidry wrote:
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:
http://lod.openlinksw.com/sparql?default-graph-uri=&query=SELECT+DISTIN…
Kingsley
On Mon, Oct 10, 2016 at 1:50 PM Kingsley Idehen <kidehen(a)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.
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>
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>
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
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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