- From: Sandro Hawke <sandro@w3.org>
- Date: Thu, 26 Mar 2015 17:24:19 -0400
- To: public-sparql-dev@w3.org
- Message-ID: <55147903.5070304@w3.org>
I implemented this in an experimental TriG parser a few years ago. I just made comma work anywhere, allowing the term before the comma to be repeated. So if you want to say Alice, Bob, and Charlie all have friend Doug, you say: :Alice, :Bob, :Charlie :hasFriend :Doug. Another example of subject-comma: :Alice, :Bob, :Charlie a foaf:Person. I also allowed it in the predicate position: :sandro foaf:firstName,vcard:firstName "Sandro" and in the Graph position: GRAPH :g1, :g2, :g3 { ... some triples } That says that all three of those graphs contain those triples. When you want to say that, it's incredibly painful without this syntax. Note that you can use them together: <a>,<b> <c>,<d> <e>,<f>. is 8 triples. I think this is a completely wonderful and elegant and useful syntax, and I shopped it around a little, but was unable to get folks in the RDF WG at the time (2013) interested. I resigned myself to it not being in Turtle or TriG, and I'd just put it in the language I was going to propose right after they went to Rec. Alas, that didn't happen. (It would also have allowed { } expression to occur anywhere a blank node can, as syntactic sugar for a blank node graph label, and make the pointy brackets optional when they're not required for parsing. And maybe some other things, like date literals.) -- Sandro On 03/26/2015 07:59 AM, Bijan Parsia wrote: > I don’t understand the example or the goal. > > On 24 Mar 2015, at 16:48, Fabiano Luz <fabianocomp@gmail.com > <mailto:fabianocomp@gmail.com>> wrote: > >>> Hello Folks, >> On the predicate lists we have omitted the subject, for example: >> >> ?x foaf:name ?name ; >> foaf:mbox ?mbox . > > This is clear. > >> I wonder if there is some kind of "subject lists" where we omitted the >> predicate, for example: >> >> foaf:Bob foaf:phone ?phone1; foaf:John ?phone2 . > > Er.. not so much. Let me try reformatting: > > foaf:Bob foaf:phone ?phone1; > foaf:John ?phone2. > > Well, that syntax would be dreadful (as ambiguous) and not super > readable (contrary to the first one). I guess you could add a > pro-predicate. > > foaf:Bob foaf:phone ?phone1; > foaf:John ^^^ ?phone2. > > That could be general purpose so the first example was sugar for: > > ?x foaf:name ?name ; > ^^^ foaf:mbox ?mbox . > > I don’t see the value. > >> PS: I do not want to repeat the predicate. > > Why not? What’s the use case? > > Cheers, > Bijan. >
Received on Thursday, 26 March 2015 21:24:21 UTC