Re: Reconciling hydra rest semantics for collections with typical RDF entity relationships

The more I work with Lists, the more I think that if the concrete formats
supported at least a named head, they'd be much more useful. This is an
excellent example of that. Perhaps there's another meaning of "conformant"
that you intend? I've never been able to find the BNode requirement (as
opposed to the proper list one) in the RDF specs.

Judson


On Tue, Feb 4, 2014 at 11:26 AM, Gregg Kellogg <gregg@greggkellogg.net>wrote:

> On Feb 4, 2014, at 10:59 AM, Kingsley Idehen <kidehen@openlinksw.com>
> wrote:
>
> > On 2/4/14 1:26 PM, Markus Lanthaler wrote:
> >> This is a general problem of RDF. AFAICT, there's no way general way to
> >> solve this issue for sets. If you would use a list, you could at least
> use
> >> the list's head node (which generally is a blank node). Remember our
> >> discussions in the JSON-LD group?
> >>
> >> Both Schema.org with its ItemList and Hydra with its Collection take a
> >> rather pragmatic approach. We could of course go ahead and define a
> >> Collection's semantics so that
> >
> > I assume you've looked at RDF Schema vocabulary which does describe RDF
> Collections [1] and Containers [2].
>
> I believe Markus' was referring to RDF Collections when he said "list". Of
> course, a big problem with collections is the navigation cost in RDF, and
> you can't really chain lists together, presuming that they're conformant
> BNode-type lists. You also can't refer to such a list, as it also must
> start with a BNode (to be conformant, not from a vocabulary perspective).
>
> Containers don't work well for a remote list of values, as they use a
> separate statement for each value, and you can't refer to an external
> container holding such values.
>
> Another vocabulary to consider is the Ordered List Ontology [3].
>
> Gregg
>
> > [1] http://www.w3.org/TR/rdf-schema/#ch_collectionvocab
> > [2] http://www.w3.org/TR/rdf-schema/#ch_containervocab .
> [3] http://smiy.sourceforge.net/olo/spec/orderedlistontology.html
> > --
> >
> > Regards,
> >
> > Kingsley Idehen
> > Founder & CEO
> > OpenLink Software
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> >
> >
> >
> >
> >
>
>
>