- From: Michael Kifer <kifer@cs.sunysb.edu>
- Date: Tue, 28 Aug 2007 08:03:33 -0400
- To: Jos de Bruijn <debruijn@inf.unibz.it>
- Cc: Dave Reynolds <der@hplb.hpl.hp.com>, RIF WG <public-rif-wg@w3.org>
> Michael Kifer wrote: > >>>>>> 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. > > So, you propose to always escape it? It seems that you would then change > the xsd:string datatype, which is something we should avoid. Perhaps using xsd:string is not the right way, since this type does not have the language specifier (right?). So, we should use a different data type. Perhaps rif:text or rif:istring. But the syntax should be uniform: "...@lang"^^rif:text. Inside the "..." the @ sign should be escaped if it is not the language sign. > >>>>>> 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. > > I would suggest only presenting one of them in the document. The presentation syntax is BNF of the formal syntax with a few more details that are to be used in the examples. Using only XML for examples is a bad practice; makes documents incomprehensible. --michael > Best, Jos > > > > > > > --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 > >> > >> --------------ms080105030602000203000002 > >> Content-Type: application/x-pkcs7-signature; name="smime.p7s" > >> Content-Transfer-Encoding: base64 > >> Content-Disposition: attachment; filename="smime.p7s" > >> Content-Description: S/MIME Cryptographic Signature > >> > >> 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--------------ms080105030602000203000002-- > >> > > > > > > -- > 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 > > --------------ms020707000609050804060806 > Content-Type: application/x-pkcs7-signature; name="smime.p7s" > Content-Transfer-Encoding: base64 > Content-Disposition: attachment; filename="smime.p7s" > Content-Description: S/MIME Cryptographic Signature > > MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJEzCC > AuQwggJNoAMCAQICEB1TmNgyHOKRUL43eSjaINgwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE > BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT > I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA3MDUxMDA3NTMwOFoX > DTA4MDUwOTA3NTMwOFowRzEfMB0GA1UEAxMWVGhhd3RlIEZyZWVtYWlsIE1lbWJlcjEkMCIG > 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Received on Tuesday, 28 August 2007 12:07:44 UTC