- From: Steve Harris <steve.harris@garlik.com>
- Date: Wed, 14 Mar 2012 14:24:24 +0000
- To: Olivier Corby <Olivier.Corby@sophia.inria.fr>
- Cc: public-rdf-dawg@w3.org
- Message-Id: <1F42928C-FED7-4EC3-A396-8C77F96E6526@garlik.com>
On 2012-03-14, at 13:44, Olivier Corby wrote: > I fear that the design is becoming over complex. > > We used to have two kinds of repetitions: > > + * without loop in the path (except first step of + ...) > {n,m} with loop in the path > > Now we would have three kinds of repetitions: > > + * without loop, without duplicate > {+} {*} without loop, with duplicate > {n,m} with loop with duplicate > > In addition, {} notation is (in general) used for set but {+} enables duplicates so it is misleading > In addition {n,m} and {+} do not behave the same with loops, so it is not uniform > > > (By the way, our experience in my team is that loops in {n,m} are not welcome because very often {1,n} is used to limit the length of paths wrt +, but unfortunately paths are then trapped into loops (use case with symmetric relation, e.g. foaf:knows{1,5})) > > > Concerning distinct, I am able to prototype distinct as a global operator on path expression: > ?x distinct(path) ?y > > I would support this design. Based on absolutely no implementation experience, just gut reaction, I would prefer just the DISTINCT(path) syntax too. It's a little less like mysterious perl-style line noise. - Steve -- Steve Harris, CTO Garlik, a part of Experian 1-3 Halford Road, Richmond, TW10 6AW, UK +44 20 8439 8203 http://www.garlik.com/ Registered in England and Wales 0535 7233 VAT # 849 0517 11 Registered office: Landmark House, Experian Way, Nottingham, Notts, NG80 1ZZ
Received on Wednesday, 14 March 2012 14:25:02 UTC