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how does select/project work with extra variables?

From: Dan Connolly <connolly@w3.org>
Date: Mon, 21 Mar 2005 16:43:22 -0600
To: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Message-Id: <1111445002.8271.582.camel@localhost>

Bob write:

First, I am assuming that the
following query returns no bindings:

SELECT ?x ?y
  WHERE  { ?book dc10:title ?x }
I shouldn't since it doesn't refer to OPTIONAL or UNION within the query, and the
spec cites those as prerequisites for allowing unbound values.

but I don't see it that way... my reading of 
is that SELECT (i.e. projection) doesn't cause solutions
to get rejected. The ?y is just noise.

Would somebody please add this as a test case? EricP?

Dan Connolly, W3C http://www.w3.org/People/Connolly/
D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E
Received on Monday, 21 March 2005 22:43:24 UTC

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