2012/4/10 Dave Reynolds <[email protected]>
> On 10/04/12 16:09, Andrés Zules wrote:
>
> 2012/4/10 Dave
> Reynolds<dave.e.reynolds@**gmail.com<[email protected]>
>> >
>>
>
> Are you sure that was the query you ran?
>>> Or alternatively are you sure that was the ontology you ran it over?
>>>
>>
>>
>> The only inverse of pizza:isToppingOf is pizza:hasTopping so you are
>>> effectively asking the query:
>>>
>>> ?pizza pizza:hasTopping pizza:MushroomTopping .
>>>
>>> Which should return empty for that ontology.
>>>
>>>
>> Yes, I am sure. But it's strange I run without reasoner:
>>
>> SELECT ?NombrePizza
>> WHERE {
>> ?NombrePizza pizza:isToppingOf pizza:MushroomTopping .
>> }
>>
>> And the result is empty, but with (without reasoner):
>>
>> SELECT ?NombrePizza
>> WHERE {
>> ?NombrePizza ?Relacion pizza:MushroomTopping .
>> ?Relacion owl:inverseOf pizza:isToppingOf .
>> }
>>
>> The result is
>>
>> DefaultOWLNamedClass(
>> http://www.co-ode.org/**ontologies/pizza/pizza.owl#**FourSeasons<http://www.co-ode.org/ontologies/pizza/pizza.owl#FourSeasons>
>> )
>> DefaultOWLNamedClass(
>> http://www.co-ode.org/**ontologies/pizza/pizza.owl#**Mushroom<http://www.co-ode.org/ontologies/pizza/pizza.owl#Mushroom>
>> )
>> DefaultOWLNamedClass(
>> http://www.co-ode.org/**ontologies/pizza/pizza.owl#**Giardiniera<http://www.co-ode.org/ontologies/pizza/pizza.owl#Giardiniera>
>> )
>> DefaultOWLNamedClass(
>> http://www.co-ode.org/**ontologies/pizza/pizza.owl#**LaReine<http://www.co-ode.org/ontologies/pizza/pizza.owl#LaReine>
>> )
>>
>
> That sounds like a bug somewhere. As far as I can see the only inverseOf
> pizza:isToppingOf is pizza:hasTopping and the only mentions of hasTopping
> are as class restrictions.
>
> I can't see how the query should return anything *with* inference, let
> along without inference!
>
> The Ontology models both pizzas and toppings as classes and there is no
>>> pizza:hasTopping relationship between the classes. Each of the Pizza
>>> classes like FourSeasons are defined via:
>>>
>>> <owl:Class rdf:about="#FourSeasons">
>>> <rdfs:label xml:lang="pt">QuatroQueijos</****rdfs:label>
>>>
>>> <rdfs:subClassOf>
>>> <owl:Restriction>
>>> <owl:onProperty rdf:resource="#hasTopping"/>
>>> <owl:someValuesFrom rdf:resource="#****MushroomTopping"/>
>>>
>>> </owl:Restriction>
>>> </rdfs:subClassOf>
>>> ...
>>>
>>> So an instance of FourSeasons would have an instance of a MushroomTopping
>>> on, which is the not the same as your query and the ontology has no such
>>> instances anyway.
>>>
>>> In any case to do anything useful with that ontology you really need a
>>> full DL reasoner such as Pellet.
>>>
>>> Dave
>>>
>>>
>> Thanks Dave. I dont know why my query's result is 4 classes, i am beginner
>> with the SPARQL and execute that statement testing many others, do you
>> have
>> a alternative query? I only want pizzas with Mushrooms.
>>
>
> Well that ontology is a bit painful to work with at the SPARQL level but
> you could query for (untested example):
>
> SELECT * WHERE
> {
> ?pizza rdfs:subClassof [
> owl:onProperty pizza:hasTopping;
> owl:someValuesFrom pizza:MushroomTopping ] .
> }
>
> Dave
>
Thanks Dave ... I realize on protege and jena this query:
SELECT *
WHERE {
?X ?Y pizza:MushroomTopping .
}
See outputs
https://plus.google.com/photos/116190906023059719803/albums/5730984081208355185
I infer that
| _:b2 | owl:someValuesFrom
|
| _:b5 | owl:someValuesFrom
|
| _:b6 | owl:someValuesFrom
|
| _:b7 | owl:someValuesFrom
|
and
DefaultOWLNamedClass(
http://www.co-ode.org/ontologies/pizza/pizza.owl#FourSeasons)
DefaultOWLObjectProperty(
http://www.co-ode.org/ontologies/pizza/pizza.owl#hasTopping) etc etc etc
are the pizzas with MushroomTopping
Why does Jena return _:b* and no return the names? I dont understan why the
results have differences
Do you have some idea?
- - -
Fabricio Andrés Zules Acosta
