A SPARQL Query to get my pizza's name

Question

I am just a beginner in SPARQL and can write some basic queries. I have a pizza ontology in which there is one pizza whose properties are as follows:

rdf:subClassOf NamedPizza

hasTopping only (MozzarellaTopping
              or PeperoniSausageTopping
              or TomatoTopping)

hasTopping some MozzarellaTopping

hasTopping some PeperoniSausageTopping

hasTopping some TomatoTopping

i have written the following query, but it gives no result.

SELECT * WHERE
{
  ?pizza rdfs:subClassof [
    owl:onProperty :hasTopping;
    owl:someValuesFrom :MozzarellaTopping ] .
  ?pizza rdfs:subClassof [
    owl:onProperty :hasTopping;
    owl:someValuesFrom :PeperonSausageTopping ] .
  ?pizza rdfs:subClassof [
    owl:onProperty :hasTopping;
    owl:someValuesFrom :TomatoTopping ] .
}

What is the SPARQL query to get the name of this pizza?

i am using Protege 4.2 as well as TopBraid to run the SPARQL query

score 4 · Answer 1 · answered Mar 04 '13 at 22:02

In your SPARQL query you write rdfs:subClassof instead of rdfs:subClassOf ('o' instead of 'O'). Capitalisation matters, because the prefix notation is just shorthand for URIs and in URIs different characters (like lowercase instead of uppercase) make a different URI.

score 2 · Answer 2 · answered Feb 24 '13 at 17:48

2

Cut the query down until it is yielding something, then look to see why the part you have removed is not matching the data.

answered Feb 24 '13 at 17:48

AndyS

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A SPARQL Query to get my pizza's name

2 Answers2