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Re: pfps-04

From: pat hayes <phayes@ihmc.us>
Date: Thu, 24 Jul 2003 14:00:25 -0500
Message-Id: <p06001a17bb45dcb18c2b@[10.0.100.23]>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: bwm@hplb.hpl.hp.com, www-rdf-comments@w3.org

>From: Brian McBride <bwm@hplb.hpl.hp.com>
>Subject: Re: pfps-04
>Date: 24 Jul 2003 15:53:39 +0100
>
>>  On Wed, 2003-07-23 at 23:03, Peter F. Patel-Schneider wrote:
>>
>>  [...]
>>
>>  > Therefore for the RDF entailment rules to be complete, no XML Literal can
>>  > have a character string as its denotation.
>>
>>  Right.  The denotation of an XML Literal is an octet sequence, as
>>  defined by the xml canonicalization spec, see the note in:
>>
>> 
>> 
>>http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-concepts-20030117/#section-XMLLiteral
>
>Unfortunately this does not answer the question.  Octet sequence is
>undefined in http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/.  At
>least some places in this document appear to indicate that an octet
>sequence is just a sequence of (Unicode?) characters.  (See for example,
>the example in Section 2.2 of ``the Canonical XML version of elem2 from the
>second case''.)  Also, the phrase ``exclusive canonical XML refers to XML
>that is in exclusive canonical form'' appears to indicate that exclusive
>canonical XML is a subset of XML, again indicating that octets should
>probably be a restricted form of (Unicode?) characters.
>
>Following pointers leads to
>http://www.w3.org/TR/2001/REC-xml-c14n-20010315, where the canonical form
>of an XML document is a physical representation of the document encoded in
>UTF-8, and talks about octets encoding various kinds of characters.  This
>doesn't help matters too much.
>
>So the question boils down to whether octets and Unicode characters are
>disjoint.

You seem to have reached the conclusion I had 
come to, viz. that this question is indeterminate 
and hence beyond the ability of the RDF spec to 
resolve. Hence the 'agnosticism' comment.

Pat



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Received on Thursday, 24 July 2003 15:00:27 GMT

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