Re: How to avoid that collections "break" relationships

On 03/31/2014 08:29 AM, Ruben Verborgh wrote:
> Hi Peter,
> This is why I started by saying the focus of the discussion should be on what we want to achieve.
> With my proposed solution, it is achieved.
> Furthermore, this solution allows you to add any metadata you might like;
> a Hydra client just wouldn't need it (even though others might).
> Right now, don't need anything else than just finding the members of a collection.
>> But this is violating both the spirit and the letter of RDF.   It would be better to introduce entirely new syntactic mechanisms
> A new syntax would break everything that exists. How is that better?
> The proposed approach doesn't break anything and achieves what we need,
> without violating the RDF model.
>> Huh?  If you want to be in the RDF camp, you have to play by RDF rules.
> And we do that.
>     </people/markus> foaf:knows [ hydra:memberOf </people/markus/friends> ].
>      means “Markus knows somebody who is a member of collection X".

But that's not what this says.  It says that Markus knows some entity that is 
related by an unknown relationship to some unknown other entity.
> Check that collection X to find out if Markus knows more of them.
> I'm not saying there will be more in there… just saying that you could check it.
> Handy for a hypermedia client. Works in practice, doesn't break the model.
> If you want more semantics, just add them:
>      </people/markus/friends> :isACollectionOf [
>          :hasPredicate foaf:knows;
>          :hasSubject </people/Markus
>      ]
> But that is _not_ needed to achieve my 1 and 2.

Well this certainly adds more triples.  Whether it adds more meaning is a 
separate issue.

> Best,
> Ruben

It appears that you feel that adding significant new expressive power is 
somehow less of a change than adding new syntax.  I do not feel this way at all.


Received on Monday, 31 March 2014 15:41:44 UTC