Re: [Rdfapi-php-interest] retrieving superclasses

[Richard C. <ri...@cy...>]

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).

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:

    WHERE (?property rdfs:domain ?class), (?class rdfs:subClassOf 
myns:Mammal)

(I didn't actually try anything of this.)

Cheers,
Richard