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Re: Discussion of property paths, SPARQL and N3

From: Andy Seaborne <andy.seaborne@talis.com>
Date: Fri, 29 Jan 2010 10:57:13 +0000
Message-ID: <4B62BF09.7040109@talis.com>
To: SPARQL Working Group <public-rdf-dawg@w3.org>


On 27/01/2010 12:58 PM, Andy Seaborne wrote:
> http://lists.w3.org/Archives/Public/public-cwm-talk/2010JanMar/0002.html
> and replies.
>
> Andy

Now also a comment:
http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/2010Jan/0007.html

One point arising is the use of "/" as the path follow symbol.  N3 uses 
"!" (after UUCP) and the design note

http://www.w3.org/DesignIssues/N3Alternatives#Syntax

where it is noted that N3 might acquire expression syntax so reserving + 
- * / makes sense.

* and + are already used in property paths.

To add expressions in patterns to SPARQL, it would take some kind of 
expression marker like `` or ?(?x+?y) (c.f. shell syntax).

To me "!" suggests "not".  "/" builds on file paths and paths in HTTP URIs.

	Andy
Received on Friday, 29 January 2010 10:57:36 GMT

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