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Re: pfps-06

From: pat hayes <phayes@ihmc.us>
Date: Thu, 24 Jul 2003 02:49:00 -0500
Message-Id: <p06001a0ebb453f0835e3@[10.0.100.23]>
To: Graham Klyne <gk@ninebynine.org>
Cc: Brian_McBride <bwm@hplb.hpl.hp.com>, Jeremy Carroll <jjc@hpl.hp.com>, w3c-rdfcore-wg@w3.org

>Pat,
>
>I think there's a possibly valid objection in that XMLLiteral 
>datatyped literals are now not self-denoting, if I understand the 
>latest Concepts specification correctly.  Apparently, the literal 
>form is a sequence of characters, but the literal value is a 
>corresponding sequence of octets encoding those characters.

The semantics document simply refers to the Concepts document for the 
relevant definitions, so if what you say is right, and Im sure it is, 
then that's what the semantics document says also.  Apparently one of 
my change list notes was misleading, and I apologize for that; but 
the document itself merely passes the buck to Concepts.

Pat

>[[
>The lexical space
>     is the set of all strings which:
>
>...
>
>The value space
>     is the set of all exclusive Canonical XML (with comments, with 
>empty InclusiveNamespaces PrefixList ) ...
>
>Note: The lexical space and value spaces differ in that the lexical 
>space is a set of Unicode strings, whereas the value space is a set 
>of UTF-8 octet sequences.
>]]
>--
>http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-concepts-20030117/#section-XMLLiteral
>
>to find more details of the distinction, you need to follow some links...
>
>[[
>The exclusive canonical form of a document subset is a physical 
>representation of the XPath node-set, as an octet sequence, produced 
>by the method described in this specification.
>]]
>--
>http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/#def-exclusive-canonical-XML
>
>This is enough to see that the value space is an octet sequence 
>rather than a character sequence.  For further details, dig 
>further...
>
>#g
>--
>
>At 14:59 23/07/03 -0500, pat hayes wrote:
>
>>>From: Brian McBride <bwm@hplb.hpl.hp.com>
>>>Subject: pfps-06
>>>Date: 21 Jul 2003 14:28:58 +0100
>>>
>>>>
>>>>
>>>>  Peter,
>>>>
>>>>  with reference to your comment recorded as
>>>>
>>>>    http://www.w3.org/2001/sw/RDFCore/20030123-issues/#pfps-06
>>>>
>>>>  the RDFCore WG has resolved to accept this comment.
>>>>
>>>>  http://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2003Jul/0236.html
>>>>
>>>>  As you know, there have been extensive modifications to the description of
>>>>  the datatyping semantics since your comment was written
>>>>
>>>>  The current editor's draft, which is stable enough to review,
>>>>
>>>>  http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-mt-20030117/
>>>>
>>>>  now contains an account of datatyping and XML literals which treats
>>>>  XML literals uniformly with other typed literals and is more explicit
>>>>  about the exact status of LV.
>>>>
>>>>  Please reply to this message, copying www-rdf-comments@w3.org,
>>>>  indicating whether this response adequately addresses your comment.
>>>>
>>>>  Brian
>>>
>>>The document is internally inconsistent on the treatment of XML Literals.
>>>
>>>The change list in the document Semantics says that XML literals ``are now
>>>required to be in canonical form and therefore to denote their own literal
>>>string.''  This appears to mean that XML literals are just a subset of
>>>character strings.  This is completely counter to what is said in RDF
>>>Concepts, at least the version pointed to from the document.
>>
>>Peter, please be so good as to review the document.itself, not the 
>>change list, which is not worded carefully and is intended only to 
>>be a guide to the changes made in the document. If you would 
>>prefer, I could provide you with a copy with the change list 
>>deleted.
>>
>>Pat
>>
>>>However, Section 3 of the document Semantics has no mention of the fact
>>>that XML literals denote themselves.  It also says that is ``is
>>>deliberately agnostic as to whether or not XML data is considered to be
>>>identical to a character string'', which is in direct contradiction to the
>>>wording in the change list.
>>>
>>>So, I do not feel that my concerns in this area have been adequately
>>>addressed.
>>>
>>>Peter F. Patel-Schneider
>>
>>
>>--
>>---------------------------------------------------------------------
>>IHMC    (850)434 8903 or (650)494 3973   home
>>40 South Alcaniz St.    (850)202 4416   office
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>
>-------------------
>Graham Klyne
><GK@NineByNine.org>
>PGP: 0FAA 69FF C083 000B A2E9  A131 01B9 1C7A DBCA CB5E


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Received on Thursday, 24 July 2003 03:49:06 EDT

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