- From: Hugh Glaser <hg@ecs.soton.ac.uk>
- Date: Thu, 18 Apr 2013 11:19:16 +0000
- To: Paul Groth <p.t.groth@vu.nl>
- CC: Luca Matteis <lmatteis@gmail.com>, Leigh Dodds <leigh@ldodds.com>, "public-lod@w3.org> <public-lod@w3.org" <public-lod@w3.org>
On 18 Apr 2013, at 12:10, Paul Groth <p.t.groth@vu.nl> wrote: > Hi Luca, > > Sure you could implement this over a regular database... but you get benefits of using SPARQL and RDF, namely, the flexibility of the data model. > > You want to change your schema and more data you just bang it in the triple store and modify your query a bit. No need to change your schema etc. You also get this ability to have multiple schemas over the same dataset. NoSQL? <ducks /> > > > Paul > > > > > On Thu, Apr 18, 2013 at 1:01 PM, Luca Matteis <lmatteis@gmail.com> wrote: > Thanks Paul, > > That is exactly what my point was entirely about. Many service don't expose their SQL interface, so why should Linked Data? > > Regarding this Linked Data API, it seems to still require a SPARQL endpoint. In fact it states that it is a proxy for SPARQL. Would it simply be possible to implement this API without SPARQL on top of a regular database that contains triples? > > > On Thu, Apr 18, 2013 at 12:56 PM, Paul Groth <p.t.groth@vu.nl> wrote: > Hi Luc, > > We use the Linked Data API at : http://code.google.com/p/linked-data-api/ > and it's php implementation puelia: http://code.google.com/p/puelia-php/ > > There's also a java implementation. > > The linked data platform is another thing: see http://www.w3.org/TR/ldp/ > > Thanks > Paul > > > > On Thu, Apr 18, 2013 at 12:52 PM, Luca Matteis <lmatteis@gmail.com> wrote: > For me it's still a bit unclear where the "Linked Data Platform" API is defined. Is it a set of strict rules? For example, I've heard it's a way of matching a triple where a specific URI appears in its subject or object. > > Any links on where this is defined? > > > On Thu, Apr 18, 2013 at 12:27 PM, Leigh Dodds <leigh@ldodds.com> wrote: > Hi Hugh, > > On Thu, Apr 18, 2013 at 10:56 AM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote: > > (Yes, Linked Data API is cool!, and thanks for getting back to the main subject, although I somehow doubt anyone is expecting to read anything about it in this thread now :-) ) > > I'm still hoping we might return to the original topic :) > > What this discussion, and in fact most related discussions about > SPARQL as a web service, seems to overlook is that there are several > different issues in play here: > > * Whether SPARQL is more accessible to developers than other forms of > web API. For example is the learning curve, harder or easier? > > * Whether offering query languages like SPARQL, SQL, YQL, etc is a > sensible option when offering a public API and what kinds of quality > of service can be wrapped around that. Or do other forms of API offer > more options for providing quality of service by trading off power of > query expression? > > * Techniques for making SPARQL endpoints scale in scenarios where the > typical query patterns are unknown (which is true of most public > endpoints). Scaling and quality of service considerations for a public > web service and a private enterprise endpoint are different. Not all > of the techniques that people use, e.g. query timeouts or partial > results, are actually standardised so plenty of scope for more > exploration here. > > * Whether SPARQL is the only query language we need for RDF, or for > more general graph databases, or whether there are room for other > forms of graph query languages > > The Linked Data API was designed to provide a simplified read-only API > that is less expressive than full SPARQL. The goals were to make > something easier to use, but not preclude helping developers towards > using full SPARQL if that's what they wanted. It also fills a > short-fall with most Linked Data publishing approaches, i.e. that > getting lists of things, possibly as a paged list, possibly with some > simple filtering is not easy. We don't need a full graph query > language for that. The Linked Data Platform is looking at that area > too, but its also got a lot more requirements its trying to address. > > Cheers, > > L. > > -- > Leigh Dodds > Freelance Technologist > Open Data, Linked Data Geek > t: @ldodds > w: ldodds.com > e: leigh@ldodds.com > > > > > -- > ----------------------------------------------------------------------------------- > Dr. Paul Groth (p.t.groth@vu.nl) > http://www.few.vu.nl/~pgroth/ > Assistant Professor > - Web & Media Group | Department of Computer Science > - The Network Institute > VU University Amsterdam > > > > > -- > ----------------------------------------------------------------------------------- > Dr. Paul Groth (p.t.groth@vu.nl) > http://www.few.vu.nl/~pgroth/ > Assistant Professor > - Web & Media Group | Department of Computer Science > - The Network Institute > VU University Amsterdam
Received on Thursday, 18 April 2013 11:25:09 UTC