Re: [Tracker] Zeitgeist ontology and Tracker

[Martyn Russell <martyn lanedo com>]

On 22/03/11 23:12, Philip Van Hoof wrote:
> On Tue, 2011-03-22 at 21:15 +0100, Mikkel Kamstrup Erlandsen wrote:
> > Hi all,

[snip]

> While comparing the two, here are some examples:
>
> o. zg: {} : In Tracker we don't allow brand specific namespaces. NEO is
>     the namespace that we chose for this (New Event Ontology).
>
> o. Those "Please do no instantiate directly, but use one of the sub
>     classes." - like rules are not ok for us
>
> o. zg:eventId : We don't allow such IDs in the ontology. And ID means
>     that it's referring to something. A "something" is a rdfs:Resource.
>
>     ps. If you want to use integral IDs in your framework, you can use
>         tracker:id() on the resource

I agree with Philip here,

> o. zg:timestamp rdfs:range xsd:long: xsd:integer is int64 in Tracker, I
>     think we don't even support xsd:long as type atm
>
> o. zg:hasSubject: must be nie:InformationElement as range

Philip, we already have nie:subject, doesn't it make more sense for the 
Zg team to just filter based on the existence of nie:subject instead of 
having a boolean to check that?

> o. zg:hasActor: I think it should also be a nie:InformationElement as
>     range, but in NEO we apparently didn't fix that. No idea why.
>
> o. The rules for zg:hasActor are in conflict with our own .desktop miner

I see, yes, there is some overlap. IMO, it makes more sense to use:

   zg:actor
        a rdf:Property ;
        rdfs:comment "The application or entity responsible for 
emitting the event. For applications the format of this field is the 
base filename of the corresponding .desktop file with an app:// URI 
scheme. For example /usr/share/applications/firefox.desktop is encoded 
as app://firefox.desktop" ;
        rdfs:domain zg:Event ;
        rdfs:range nfo:FileDataObject ;
        rdfs:label "actor" ;
        nrl:maxCardinality "1"^^xsd:nonNegativeInteger .  zg:actor

But if you need to use anything other than a desktop file, we might want 
to change the range back to rdfs:Resource.

Either way, linking to the urn of the desktop file here makes sense.

> o. zg:hasEventManifestation: rdfs:type? What is that? rdf:type? In our
>     fixed version we just removed this.

Good question, what is that?

--
Regards,
Martyn