Hi Ruben.
On 21.12.2016 23:15, Ruben Verborgh wrote:
Hi Markus,
(I did read your paper ;-)
Awesome :-)
As editors, we have of course read all papers that have been published in that issue (and some others).
...
This also show our departure from typical SemWeb ideas: with TPF, we accept that some things are slow. Any query is possible (given a completely implemented engine), but some of them just take a lot of time.
Sorry, but this is really not what I am seeing. The queries I have tried all failed entirely. They were not slow, they completed computation with no results, time outs, or otherwise looped without any success.
...
I don't have too much experience with Wikidata, unfortunately, but I can give you some inspiration with DBpedia: http://client.linkeddatafragments.org/ Would be a good idea to port these queries.
No need to translate DBpedia queries. We have a large number (over 300) of user-written example queries for Wikidata:
https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/queries/examples
Maybe you can find a good example there. I am afraid that blocking operators are rather essential in practice though, unless you use neither aggregates nor put a limit on the number of results (the latter makes sense only with ordered results, at least if you want paging).
Best,
Markus