Re: Hydra use case: Linked Data Fragments (ISSUE-30)

On Mar 18, 2014, at 3:56 PM, Ruben Verborgh <ruben.verborgh@ugent.be> wrote:

>> It would be interesting to benchmark that.. I was thinking of JSON-LD
>> representations of the following form
>> 
>> [
>> { "@id": "http://subject", "http://predicate": { "@value": "object" },
>> { "@id": "http://subject", "http://predicate": { "@id": "http://object" },
>> …
>> ]
> 
> (Diverging a bit here to to JSON-LD, sorry in advance.)
> 
> Aha, that's something different.
> My current approach to serve Turtle is streaming;
> the current approach to serve JSON-LD is
> capturing the Turtle stream, then converting the whole (non-streaming):
> https://github.com/LinkedDataFragments/Server/blob/master/lib/JsonLdFragmentWriter.js
> 
> However, the above _could_ be generated in a streaming way;
> and then also parsed. But do streaming JSON-LD libs exist?
> 
> In any case, I need the triples in-memory as triples
> to do querying, so really { s: … p: … o: … } things.
> 
>> Probably not. However, *if* we decide to support them, I would prefer to
>> special-case qnames. I'm offline at the moment but I think the CURIE spec
>> recommends wrapping them in square brackets [prefix:suffix].
> 
> That might even not be necessary, as indicated by Greg:
> https://github.com/HydraCG/Specifications/issues/30#issuecomment-37763839

This form if Curie was deprecated in RDFa 1.1, so it shouldn't be necessary.

Gregg

>>> It depends on how we'd express property paths.
>> 
>> I think the simplest thing would be to use lists
> 
> OK, let's postpone this until we have a concrete syntax.
> 
>>> It would be needed we'd also need to detail how each part of the graph
>>> can be accessed, i.e., what kind of fragments your are offering.
>>> Without that, no query plan, without query plan, exponential times
>>> (or you'd have to download the whole thing before querying it).
>> 
>> Well, the ApiDocumentation along with property ranges and supportedProperty
>> kind of expresses that information, doesn't it?
> 
> That could be, yes.
> Any concrete examples I could investigate?
> 
> Cheers,
> 
> Ruben

Received on Tuesday, 18 March 2014 23:06:23 UTC