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Re: IRI references rewording

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Wed, 14 Sep 2005 14:19:12 +0100
Message-ID: <43282350.9000306@hp.com>
To: Dan Connolly <connolly@w3.org>
CC: RDF Data Access Working Group <public-rdf-dawg@w3.org>



Dan Connolly wrote:
> On Wed, 2005-09-14 at 11:08 +0100, Seaborne, Andy wrote:
> 
>>I have changed the text in the gramamr section for IRI references to 
>>explicitly say which rules are required to generated valid IRIs
>>
>>"""
>>IRI References
>>
>>SPARQL is defined in terms of absolute IRIs (this includes the fragment 
>>identifier). IRI references formed by rule Q_IRI_REF and by rule QName (after 
>>prefix expansion) must be valid according to RFC 3987 [RFC3987] and RFC 3986 
>>[RFC3986].
> 
> 
> That has the same problem; it's vacuuous. Anything that's an IRI
> reference is already valid.
> 
> 
>> They are converted to absolute IRIs according to RFC 3987 and RFC 
>>3986, using the base IRI defined by the BASE clause if present in the query.
>>"""
> 
> 
> That's redundant w.r.t. some text under Query Term Syntax
> ("SPARQL provides an abbreviation mechanism for IRIs ...") Please
> either delete it or add forward and backward references.


We put that text in as part of addressing the case of base IRI (this isn't 
prefix expansion - it's IRI resolution) in response to a comment.

> 
> I suggest:
> 
> IRI References
> 
> References formed by rule  Q_IRI_REF must be conform to the
> generic syntax of IRI references in
> section 2.2.  ABNF for IRI References and IRIs[RFC3987].
> For example, the
> Q_IRI_REF <abc#def> may occur in a SPARQL query string, but
> the Q_IRI_REF <abc##def> must not.
> 
> References formed by rule QName (after prefix expansion) must conform
> to the generic syntax of (absolute) IRIs. 

There is a "must" there but I am having rouble seeing how not to say something 
along that line.

It does not exclude generation of non-IRI references as well as IRI 
references.  I was left wondering what a "Reference" was.

Maybe:

"""
SPARQL is defined in terms of absolute IRIs (this includes the fragment 
identifier).

Grammar production <a>Q_IRI_REF</a> forms IRI references and these must 
conform to the generic syntax of IRI references described in section 2.2. of 
[RFC3987].

Grammar production <a>QName</a> forms IRI references after <a href="rq23 
section 2.2">prefix expansion</a> and these must conform to the generic syntax 
of IRI references.

For example, the
Q_IRI_REF <abc#def> may occur in a SPARQL query string, but
the Q_IRI_REF <abc##def> must not.

IRI references are converted to absolute IRIs according to RFC 3987 and RFC 
3986, using the base IRI defined by the BASE clause if present in the query.
"""

	Andy
Received on Wednesday, 14 September 2005 13:19:38 GMT

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