Hi Paul, Hi Lee, the query
PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX plate: <http://www.owl-ontologies.com/testFood2.owl#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?ingredients WHERE { plate:ChickenWithTomato rdfs:subClassOf [ owl:onProperty plate:hasIngridients ; owl:someValuesFrom ?ingredients ] } works fine in protégé, with jena not so ever but like paul said i need pellet to work (must search how i do that) but with WHERE { plate:ChickenWithTomato plate:hasIngredients ?ingredients } it doesn't work. i'm trying to install also IsaViz to see the graph but with no sucess so far. I have more questions, what do you mean by "You have the query the direct triples"? You mean this? <owl:Class rdf:about="#RedMeat"> <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"; >Red Meat</rdfs:label> <rdfs:subClassOf> <owl:Class rdf:about="#Meat"/> </rdfs:subClassOf> </owl:Class> ( I really have to put IsaViz to work to understand this better.) and other thing, in the last query ... plate:ChickenWithTomato rdfs:subClassOf [ owl:onProperty plate:hasIngridients ; owl:someValuesFrom ?ingredients... can please explain better why it works? i'm trying to "read" it but i dont understand it. -> "the plate chicken with tomato (subject ) is subclass of (property) ((object) onProperty of the subject it hasIngredients; ((object) (have) someValuesFrom ?ingredients" ok, its wrong what im saying, but i'm just trying to understand what's there... I notice that i'm search the "<rdfs:subClassOf>" of the node, is that correct? 2009/6/14 Paul Gearon <[email protected]> > On Sat, Jun 13, 2009 at 1:21 PM, Samuel Pedro<[email protected]> > wrote: > > I changed the ontology, have now this class, > > <snip/> > > At a glance it looks better. I haven't looked at it in detail though. > > > If i want to know which ingredients have the plate "Chicken with Onions"? > > Shouldn´t be... > > > > PREFIX owl:<http://www.w3.org/2002/07/owl#> > > PREFIX plate:<http://www.owl-ontologies.com/testFood2.owl#";> > > SELECT ?ingredients > > > > WHERE { ?ingredients owl:someValuesFrom plate:ChickenWithTomato } --> > (how > > do you read this?) > > > > what's wrong this time? > > For a start, Lee is right. You have the query the direct triples > (unless you have something to generate inferred triples for you, like > Pellet). > > Secondly, your use of owl:someValuesFrom in inappropriate. This is a > predicate that is used to describe how a predicate works. It isn't > used for specific instances of anything. In your ontology, you've used > this predicate to describe a constraint on the use of #hasIngredient. > > Presuming you have a reasoner running (generating inferred triples), > then you should be asking: > > WHERE { plate:ChickenWithTomato plate:hasIngredients ?ingredients } > > Paul > -- -- Samuel Pedro
