Re: [Tracker] nfo:Image identifier

[Martyn Russell <martyn lanedo com>]

On 21/09/10 14:55, MichaÅ Frynas wrote:
> I have following problem. I'm developing a new ontology handling profile
> data. One of the attributes the profile contains is its icon. I'm trying
> to reuse some parts of existing Nepomuk ontologies, and that's why I'd
> like to utilize one of nfo:Icon or nfo:Image classes. I've written
> following description:
>
> mpo:hasIcon a rdf:Property ;
>      rdfs:label "hasIcon" ;
>      rdfs:comment "Reference to the icon assocciated with current profile" ;
>      nrl:maxCardinality 1 ;
>      rdfs:domain mpo:Profile ;
>      rdfs:range nfo:Image .
>
> After uploading my ontology, I import a ttl file having following dataset:
>
> <MyCar> a mpo:Profile ;
>          mpo:name "Car" ;
>          mpo:hasIcon "urn:uuid:981e3c86-b0be-e38c-f224-cc2dce8810c5" ;
>          mpo:xpos 10 ;
>          mpo:ypos 12 .
>
> where mpo:hasIcon is the Image Id i've received using that query: select
> ?s { ?s a nfo:Image .}
> And now, when I try to get my data using following query, I get nothing:
> select ?s ?t { ?s a mpo:Profile; mpo:hasIcon ?t . }
> Maybe someone knows what is wrong with it.
> Is that ID urn:uuid:981e3c86-b0be-e38c-f224-cc2dce8810c5 a correct ID of
> nfo:Image?

Yes, it is a unique identifier for the resource in the database. Most 
resources are described this way. You can find out what information we 
know about a given resource using tracker-info <urn>

--
Regards,
Martyn