All,
Killing two birds with one stone: we’ve released a new Wikidata Truthy
instance as part of our Linked Open Data Cloud contribution effort.
In addition, there’s a release showcase page that includes example
queries related to the discussion between Peter and me
below—specifically, sub- and super-property exploration using property
paths that compute a full transitive closure [1][2].
Previously, I left this topic at the point of setting a starting point
for the transitive closure. This new page specifically includes examples
demonstrating various ways of setting a starting point, which requires
some level of specificity.
Enjoy!
Links:
[1] https://www.openlinksw.com/data/html/about-wikidata-truthy-2025-11.html
<https://www.openlinksw.com/data/html/about-wikidata-truthy-2025-11.html>[2]
https://www.openlinksw.com/data/screencasts/wikidata-truthy-2025-11.mp4
Kingsley
On 10/9/24 3:01 PM, Peter F. Patel-Schneider wrote:
I did.
>> https://qlever.cs.uni-freiburg.de/wikidata/
peter
On 10/9/24 14:41, Kingsley Idehen via Wikidata wrote:
Hi Peter,
On 10/9/24 2:26 PM, Peter F. Patel-Schneider wrote:
I use the QLever Wikidata SPARQL service at
https://qlever.cs.uni-freiburg.de/wikidata/
The Virtuoso service I use is at
https://wikidata.demo.openlinksw.com/sparql
I believe that both of these are the standard endpoints and are the
same that you used.
peter
For this kind of transitive closure Virtuoso needs a starting point.
https://wikidata.demo.openlinksw.com/sparql?default-graph-uri=http%3A%2F%2Fwww.wikidata.org%2F&query=SELECT+%3Fsub+%3Fsuper+WHERE+%7B%0D%0A++%3Fsub+wdt%3AP279%2B+%3Fsuper+.%0D%0A+++FILTER+%28%3Fsub+%3D+%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2FQ391414%3E%29%0D%0A%7D+%0D%0A&format=text%2Fhtml&timeout=30000&signal_void=on
Can you not share a similar SPARQL Protocol link for QLever?
Kingsley
On 10/9/24 14:21, Kingsley Idehen via Wikidata wrote:
Hi Peter,
On 10/9/24 11:26 AM, Peter F. Patel-Schneider wrote:
Here is a query that I wanted to evaluate:
SELECT ?sub ?super WHERE {
?sub wdt:P279+ ?super .
}
Fine on QLever, fails immediately on Virtuoso, times out in
Blazegraph.
Please share the Virtuoso SPARQL endpoint URL for this query.
That's enables a common start point. In addition, what's the SPARQL
service endpoint for the QLever instance you are using?
Kingsley
It would be a good idea to collect wanted but difficult queries to
help inform the WDQS team when they finally replace Blazegraph. I
have over 60 queries that I ran during investigations of the
Wikidata ontology. Some of them were too tough for QLever and
quite a few were pieces of the too-tough queries that I then
combined the results of.
peter
On 10/9/24 10:43, Kingsley Idehen via Wikidata wrote:
Denny and others,
Here’s my basic goto query for SPARQL.
|SELECT (SAMPLE(?s) as ?sample) (count(*) as ?count) ?o WHERE {?s
a ?o} GROUP BY ?o ORDER BY DESC (?count) LIMIT 20 |
SPARQL Results Links:
1.
Solution from Our Wikidata Endpoint
<https://wikidata.demo.openlinksw.com/sparql?default-graph-uri=http%3A%2F%2Fwww.wikidata.org%2F&query=SELECT+%28SAMPLE%28%3Fs%29+as+%3Fsample%29+%28count%28*%29+as+%3Fcount%29+%3Fo%0D%0AWHERE+%7B%3Fs+a+%3Fo%7D%0D%0AGROUP+BY+%3Fo%0D%0AORDER+BY+DESC+%28%3Fcount%29%0D%0ALIMIT+20&format=text%2Fx-html%2Btr&timeout=30000&signal_void=on>
2.
QLever’s Endpoint doesn’t handling this, assuming
https://qlever.cs.uni-freiburg.de/wikidata/sk8I2D is the correct
one.
What am I missing here?
Kingsley
On 10/9/24 10:31 AM, Kingsley Idehen via Wikidata wrote:
HI Denny,
On 10/2/24 5:05 AM, Denny Vrandečić wrote:
The most promising show of "we are ready" for the Virtuoso Open
Source edition would be what QLever has been doing for a while:
to provide a public endpoint with the data loaded, and kept up
to date using the public edit stream. That would be an
undeniably strong argument for "just use this!"
Aren't you aware of the public endpoints we've provided for years?
[1] https://wikidata.demo.openlinksw.com/sparql
[2] https://wikidata.demo.openlinksw.com/fct
That's VOS based.
Is there something that's missing etc?
Kingsley
On Thu, Sep 26, 2024 at 4:32 PM Samuel Klein
<[email protected]> wrote:
An updated benchmark eval (or self-evals) for the top db
candidates
seems called for :) we would all love to see it.
Ideally with a canonical hardware or vm spec that all can
use...
I don't know if the QLever self-eval from the spring is the
right place
to start, but I believe these
<https://ad-research.cs.uni-freiburg.de/benchmarks/wdqs-queries/>
are
the ~300 queries they used for a Wikidata benchmark.
🌍🌏🌎🌑
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Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
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Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Home Page:http://www.openlinksw.com
Community Support:https://community.openlinksw.com
Weblogs (Blogs):
Company Blog:https://medium.com/openlink-software-blog
Virtuoso Blog:https://medium.com/virtuoso-blog
Data Access Drivers
Blog:https://medium.com/openlink-odbc-jdbc-ado-net-data-access-drivers
Personal Weblogs (Blogs):
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Legacy Blogs:http://www.openlinksw.com/blog/~kidehen/
http://kidehen.blogspot.com
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