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Re: Issues found in Turtle spec

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Mon, 29 Aug 2011 21:42:31 +0100
Message-ID: <4E5BF9B7.60404@epimorphics.com>
To: public-rdf-wg@w3.org


On 29/08/11 21:36, Alex Hall wrote:
> On Mon, Aug 29, 2011 at 4:03 PM, Gavin Carothers <gavin@topquadrant.com
> <mailto:gavin@topquadrant.com>> wrote:
>
>      > The list example in section 6 uses a list on it's own, without a
>     predicate
>      > or object, which is not allowed by the grammar (neither is a
>      > blankNodeProperyList). Either the EBNF should be updated to allow
>     for these
>      > forms, or the examples should be changed such that ( ... ) and [
>     ... ] are
>      > used only in the context of being a subject or object. This
>     implementation
>      > will generate triples, however an error will be generated if the
>     parser is
>      > run in validation mode.
>
>     It seems likely that this is more of the same errors from above,
>     examples that are not valid Turtle should likely be removed from the
>     specification as just noting that they aren't valid doesn't seem to be
>     enough.
>
>
> This is a deviation from SPARQL, where collections and blank node
> property lists are allowed on their own in addition to as the subject or
> object of a triple.  Whether to amend Turtle to match the SPARQL
> definition in this respect is an open issue:
>
> http://www.w3.org/2011/rdf-wg/track/issues/19
>
> (This deals only with blank node property paths, but a resolution on
> this issue should also apply to collections).
>
> -Alex

The SPARQL 1.1 Query last call document has note to allow removing 
free-standing lists e.g. SELECT * { (1 ?x 3 4) . }

See red box at:
http://www.w3.org/TR/sparql11-query/#grammar

	Andy


>
Received on Monday, 29 August 2011 20:43:01 GMT

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