- From: Tim Berners-Lee <timbl@w3.org>
- Date: Tue, 26 Jan 2010 12:39:21 +0100
- To: Dan Connolly <connolly@w3.org>
- Cc: public-cwm-talk@w3.org
Paths have been in N3 for a long time and much
discussed.
The characters used are "!" and "^".
A discussion of the options is in
http://www.w3.org/DesignIssues/N3Alternatives#Syntax
It would be a really bad idea not to use the same punctuation in SPARQL.
Could you pass that on?
Tim
PS: Note also ^ is related to ^^ in that ^^ can be regarded
as ^ if you want to reify datatypes -- to make an RDF
system which uses only strings.
On 2010-01 -22, at 22:10, Dan Connolly wrote:
> The SPARQL WG is looking at paths...
> http://www.w3.org/2009/sparql/docs/property-paths/Overview.xml
>
> ... which is quite important for querying, e.g. lists:
>
> select ?elt where { <alist> rdf:rest*/rdf:first ?elt }
>
> Meanwhile, they're using / where n3 uses ., I think.
>
> They use ^ both as N3 uses it and to do the is/of thing.
>
> They also include regex syntax such as +,*, ? and {n,m}
> and ()s (but not for match groups).
>
> It's pretty hard to argue against this in SPARQL; people
> have been asking for it from the very start of the SPARQL
> design.
>
> Perhaps N3 should adapt in this direction?
>
> The one place I'm inclined to push on is is/of; I'd
> hate to lose that from N3. Though... with the @keywords
> mechanism, maybe it's not so much of a conflict.
>
> --
> Dan Connolly, W3C http://www.w3.org/People/Connolly/
> gpg D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E
>
>
Received on Tuesday, 26 January 2010 11:36:32 UTC