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Re: Minor Syntax issues

From: Steve Harris <S.W.Harris@ecs.soton.ac.uk>
Date: Tue, 15 Feb 2005 17:12:47 +0000
To: "'RDF Data Access Working Group'" <public-rdf-dawg@w3.org>
Message-ID: <20050215171247.GM8916@login.ecs.soton.ac.uk>

On Tue, Feb 15, 2005 at 05:02:26PM +0000, Andy Seaborne wrote:
> 3/ Just OPTIONAL, not []
> (note that OPTIONAL can take a {} pattern or a plain triple pattern - 
> restricting to just {} would be OK).

Quick predication: this reminds me of the popular C typo relating if to
blocks, ie. the difference between

	SELECT ?name ?email ?phone
	WHERE (?x e:worksFor <e:companyX>)
	      OPTIONAL{(?x e:emailAddress ?email)
		       (?x e:phoneNumber ?phone)}
	SELECT ?name ?email ?phone
	WHERE (?x e:worksFor <e:companyX>)
	      OPTIONAL (?x e:emailAddress ?email)
		       (?x e:phoneNumber ?phone)

I suspect it will catch people out the same way. Not a huge problem though.

- Steve
Received on Tuesday, 15 February 2005 17:12:52 UTC

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