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How to query a LUBM ontology(extracted form given univ-bench.owl. given on the official site using generator) to find how many university it contains?

Priya Singh
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  • What? Have you generated the dataset or just the ontology? Using a SPARQL `COUNT` query doesn't work for you? How are your SPARQL skills? Have you walked thorugh any SPARQL tutorial so far? Which triple store do you use? – UninformedUser Dec 01 '17 at 08:49
  • And "how many universities" doesn't make any sense for the LUBM benchmark. The benchmark generator takes the number of universities as mandatory input parameter. – UninformedUser Dec 01 '17 at 08:51
  • That is true "The benchmark generator takes the number of universities".If i forget this then what is the another option to count it. – Priya Singh Dec 01 '17 at 10:51
  • Load the data into a triple store and write a SPARQL `COUNT` query – UninformedUser Dec 01 '17 at 11:54
  • no its not working – Priya Singh Dec 02 '17 at 10:35
  • WHAT is not working? – UninformedUser Dec 02 '17 at 11:11
  • please write a proper query to fetch universities – Priya Singh Dec 03 '17 at 05:20
  • Please, tell me **what is not working**? Which triple store do you use? Why is it no option to learn SPARQL? You're trying to benchmark triple stores, I don't know why. What is the use case? – UninformedUser Dec 03 '17 at 08:54
  • I have extracted LUBM benchmark by some university which i don't know, now using Jena to store triples and want to know through "how many universites are there in a LUBM ontology" – Priya Singh Dec 03 '17 at 12:56
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    The documentation of aggregates in SPARQL is [here](https://www.w3.org/TR/sparql11-query/#aggregates). There you can find how to write a `COUNT` query. And I don't understand why you can't rerun the dataset generation with the number of universities that you need. It's a matter of seconds/minutes to generate the data. Even the file names can indicate the number – UninformedUser Dec 03 '17 at 17:53

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