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Re: RDF 2.0 Wishlist - Legal RDF which I can't SPARQL

From: Mischa Tuffield <mischa.tuffield@garlik.com>
Date: Thu, 29 Jul 2010 18:59:35 +0100
Cc: Paul Gearon <gearon@ieee.org>, Damian Steer <pldms@mac.com>, Semantic Web <semantic-web@w3.org>
Message-Id: <4FBB6029-A349-411D-8B48-451AFAF3A44F@garlik.com>
To: Andy Seaborne <andy.seaborne@epimorphics.com>

On 29 Jul 2010, at 18:40, Andy Seaborne wrote:

> On 29/07/2010 6:22 PM, Paul Gearon wrote:
> > On Thu, Jul 29, 2010 at 1:13 PM, Paul Gearon<gearon@ieee.org>  wrote:
> >
> > <snip/>
> >
> >> In a hack similar to the one I mentioned with FILTER, but you can always say:
> >>
> >> insert { graph<http://example.com/graph>  {
> >>   ?u  foo:Property  "something" } }
> >> { { select IRI("http://example.com/mylamefoafdocument`uri") as ?u {} } }

This is dependant on the definition of the function "IRI()", and it seems odd to me, based on the function name, that it would generate an illegal IRI. 

> 
> but it still isn't a legal IRI.

:)

> 
> There are two levels here:
> 
> The syntax, that says:
> 
> IRI_REF	  ::=  	'<' ([^<>"{}|^`\]-[#x00-#x20])* '>'
> 
> but also the syntax rules in the URI RFC (now RFC 3986) including any scheme-specific rules.
> 
> Last time, IIRC DAWG decided not to copy over the full grammar for IRIs, but to put in a more general but smaller pattern.
> 
> For example, "[" "]" are only legal as delimiters for IPv6 addresses in the authority part.
> 
> 	Andy

Am guessing I should have just emailed the SPARQL WG people, but I thought I would also flag this matter with the RDF 2.0 folks. 

Cheers, 

Mischa

> 
> >>
> >> But then I realized that this uses a non-standard constructor for
> >> IRIs! I should raise this as a possible function for SPARQL 1.1.
> >
> > I just realized that this *is* valid SPARQL 1.1. The documentation for
> > IRI() isn't defined everywhere yet (it has its own section, but
> > doesn't yet appear in the tables).
> >
> > BTW, I'm not saying that this is the solution. (All those curly braces
> > give me the shivers). But it is *a* solution.  :-)
> >
> > Regards,
> > Paul Gearon
> >
> 

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Mischa Tuffield PhD
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Received on Thursday, 29 July 2010 18:00:10 UTC

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