Syntax (was: RE: do we need INSERT?) from Seaborne, Andy on 2004-08-27 (public-rdf-dawg@w3.org from July to September 2004)

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Fri, 27 Aug 2004 17:49:27 +0100
To: public-rdf-dawg@w3.org
Message-ID: <E864E95CB35C1C46B72FEA0626A2E80803E3C0DA@0-mail-br1.hpl.hp.com>

Summary: the choice is bewteen:

1/ Separate constraints and triple patterns.  Can use (parentheses) for
both.

2/ Allow constraints and triple patterns to be mixed.  Need to differentiate
grouping symbols.

Testcase: 
A nested graph pattern (( (?x :y ?z) (?x :y1 ?z1 ))
A nested constraint    (( (?z < 2 ) ))

This requires arbitrary lookahead to distinguish.

If there is another choice, please correct me.

I favour 2.  

I hear some support for 1.
I have heard the argument for not separating constraints and triple patterns
as well. 

	Andy

Received on Friday, 27 August 2004 16:49:51 UTC