Re: RIF Minutes for 21-Aug-07-rif-minutes.html

> >>>> Axel: Strings with @ signs in RDF - will this be OK in the proposed 
> >>>> format for such literals?
> >> The original proposal was that the text type is a pair of lexical form 
> >> and language code. The XML syntax would use attributes for the language 
> >> code as normal. For the presentation syntax (but see below) I'd suggest 
> >> following N3/Turtle:
> >>
> >>             "string"@lang
> >>
> >> which would correspond to the literal value ("string", lang)^^rif:text.
> > 
> > For uniformity of the syntax, it is better to use "string@lang"^^...
> > where @ is special (i.e., needs to be escaped, if one wants to include it
> > in the string. 
> > By the way, why can't we use xsd:string data type for these?
> 
> Because, in this case, it would be impossible to distinguish between
> strings with a '@', and strings with a language tag.

No. Read again about having @ a special symbol that needs to be escaped.


> >>>> Jos: this is also a need to ask the XML schema group re such literal 
> >>>> handling
> >> Exactly, and we should wait until we have their comments before 
> >> finalizing this part.
> >>
> >>>> Chris: 4 syntaxes in use: presentation + XML, ASN and "formal"
> >> I've been meaning to raise this. That does seem rather a lot.
> >>
> >> The original argument for the presentation syntax was that it was needed 
> >> to enable the semantics to be clearly presented. The bulk of the 
> >> document now uses the formal syntax for this purpose.
> >>
> >> Do we still need the presentation syntax as well?
> > 
> > The presentation syntax is basically the same as the formal syntax. We just
> > give a BNF for it.
> 
> The current document (posted conditions) defines a formal syntax which
> uses the common mathematical notation  you find in textbooks in the
> definition of well formed formulas, but the uses the concrete syntax
> (the one for which the BNF is given) in other places.  These are two
> different syntaxes.

The two syntaxes are basically the same.


	--michael  


> Best, Jos
> 
> > 
> > 
> > 	--michael  
> > 
> > 
> >> Dave
> >> -- 
> >> Hewlett-Packard Limited
> >> Registered Office: Cain Road, Bracknell, Berks RG12 1HN
> >> Registered No: 690597 England
> >>
> >>
> > 
> > 
> > 
> 
> -- 
> Jos de Bruijn            debruijn@inf.unibz.it
>                       http://www.debruijn.net/
> ----------------------------------------------
> As far as the laws of mathematics refer to
> reality, they are not certain; and as far as
> they are certain, they do not refer to
> reality.
>   -- Albert Einstein
> 
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>

Received on Tuesday, 28 August 2007 11:13:22 UTC