RE: Entailment checking with pizza ontology

Hi Mikael,



You are right, your prior version results in a syntax error when I try opening it in Protégé. At least to me, this seems to be in contradiction with the Open World Assumption, and its resulting lack of negation as failure – i.e., just because a resource does not have an object property type does not mean that it is not in fact an object property.



It is also strange that a syntax exception is thrown since your ontology does seem to be in line with the Manchester syntax document, which stipulates that an objectPropertyIRI is simply an IRI<https://www.w3.org/TR/owl2-manchester-syntax/#IRIs.2C_Integers.2C_Literals.2C_and_Entities>, but I could be wrong. At the same time, the exact same ontology in Turtle does not raise an exception:





@prefix : <http://www.co-ode.org/ontologies/pizza/pizza.owl#> .

@prefix owl: <http://www.w3.org/2002/07/owl#> .

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .



:Margherita rdf:type owl:Class ;

                rdfs:subClassOf [ rdf:type owl:Restriction ;

                                  owl:onProperty :hasTopping ;

                                  owl:someValuesFrom :MozzarellaTopping

                ] .





William



-----Original Message-----

From: Mikael Pesonen <mikael.pesonen@lingsoft.fi>

Sent: February-28-20 7:04 AM

To: semantic-web@w3.org

Subject: Re: Entailment checking with pizza ontology



There was couple of errors, Ontology needs to be the same and it seems all properties and classes need to be introduced?



Atleast this works:



Prefix: : <http://www.co-ode.org/ontologies/pizza/pizza.owl#>

Ontology: <http://www.co-ode.org/ontologies/pizza/pizza.owl>



ObjectProperty: hasTopping

Class: MozzarellaTopping

Class: Margherita

    SubClassOf:

        hasTopping some MozzarellaTopping