Re: [Rdfapi-php-interest] retrieving superclasses

[Jonathan H. <hen...@ya...>]

Hi Richard,
Thanks for your response. I've responded inline below:

--- Richard Cyganiak <ri...@cy...> wrote:
> Hi Jonathan,
> 
> Am 26.04.2005 um 17:10 schrieb Jonathan Hendler:
> [...]
> > For example - in this case I want all all the mammals and their 
> > properties
> >
> >  WHERE   (?a, rdf:type, myns:Mammal)   ,  (?b, rdfs:domain, ?a)
> >
> > ?a gives me instances of people and mammals
> > but using the whole RDQL above doesn't work.
> > Shouldn't ?b be the list of properties for at least Mammal, and maybe 
> > Persons
> > too?
> 
> No, because rdfs:domain connects properties to classes, not properties 
> to instances. It's
> 
>     myns:hasTeeth rdfs:domain myns:Mammal.
> 
> and not
> 
>     myns:hasTeeth rdfs:domain ex:Richard. (where ex:richard is a 
> myns:Mammal).

Right, so the problem seems to be the properties of subclasses.

(?a rdf:type myns:mammal) , (?a rdf:type ?x), (?y rdfs:domain ?x)

Is what I wanted.
In the above case, ?a can be be instances of people or mammals, which I hope
would be put into ?x. Then I would look for ?y (the properties) which have ?x
(people and mammals as a domain) - but that doesn't seem to work either.

Hmm. Even your query didn't work . I am using protege and it uses a different
rdfs for a namespace, perhaps this is a problem. I used my own RDFS namespace
but I guess rap didn't like it (it doesn't highlight as green when I print an
html table)
So I used createOntProperty() and addDomain to add the properties there.
So that solved the first problem. 
 
> To get all properties of myns:Mammal, try this:
> 
>     WHERE (?property rdfs:domain myns:Mammal)
> 
> To get all properties that are defined on some kind of mammal (like 
> myns:hasProperName), you would do something like this:

I tried a new query and it worked. I didn't need to specify subClass because
inferencing is on.

WHERE (?a, rdf:type, myNS:Mammal) ,(?a,  rdf:type, ?c)  ,(?x, rdfs:domain,
?c) , (?a, ?x,  ?y)

This got the results I desired, because not only did I get properties, I was
able to get the values of the properties. 


>     WHERE (?property rdfs:domain ?class), (?class rdfs:subClassOf 
> myns:Mammal)
> 
> (I didn't actually try anything of this.)
> 
> Cheers,
> Richard

Thanks for the feedback. For you to show that something worked, that should
have worked for me helped me figure out what the problem was! thanks again!