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Re: [closed] issue #pfps-07 typed literals with lang tags

From: pat hayes <phayes@ai.uwf.edu>
Date: Thu, 1 May 2003 10:07:55 -0500
Message-Id: <p05210627bad6e570c52d@[10.0.100.12]>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: www-rdf-comments@w3.org

>From: pat hayes <phayes@ai.uwf.edu>
>Subject: [closed] issue #pfps-07 typed literals with lang tags
>Date: Tue, 29 Apr 2003 16:06:56 -0500
>
>>  Peter,
>>
>>  In
>>
>>    http://lists.w3.org/Archives/Public/www-rdf-comments/2003JanMar/0088.html
>>
>>  you raised a last call comment on the RDFCore WD's which was recorded as:
>>
>>  http://www.w3.org/2001/sw/RDFCore/20030123-issues/#pfps-07
>>
>>  The RDFCore WG has accepted your comment:
>>
>>    http://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2003Apr/0361.html
>>
>>  and the wording of the current editor's draft of the semantics document
>>
>  > http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-mt-20030117/
>>
>>  incorporates conditions and rules for the case you describe.
>>
>>  Please reply to this message, copying www-rdf-comments@w3.org,
>>  indicating whether this decision is acceptable.
>>
>>  Pat Hayes
>
>This message is extraordinarily cryptic. 
>
>I would appreciate some indication of just what has been done to address
>whatever concern I had here.

OK.

The omission of this case (non-XML typed literals containing lang 
tags) from the last call document was a editorial mistake. Putting 
this case back in has necessitated making changes to the semantic 
conditions and to the closure rules to cover this case.

The semantic conditions have been altered so that lang tags  in 
non-XML typed literals are required to not influence the 
interpretation of the literal, ie they are effectively ignored by the 
semantics.  (Section 3.1, 
http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-mt-20030117/#rdfinterp)

The closure rules (see 
http://www.w3.org/2001/sw/RDFCore/TR/WD-rdf-mt-20030117/#rdf_entail ) 
now include two rules which sanction the removal, insertion or 
replacement of lang tags in any non-XML typed literal. There is a 
comment in the subsequent text to the effect that it would be 
computationally more efficient to simply strip out lang tags from all 
non-XML literals as a syntactic normalization.

In both cases, these are stated as RDF conditions, so hold in all 
semantic extensions which apply to the lang tag literal syntax.  The 
conditions on datatypes are stated so that the lexical form to which 
the datatype mapping is applied consists of the literal string, and 
does not include the lang tag (in non-XML literals). This is in line 
with the above rules, of course.

The case of lang tags in XML typed literals is covered by other rules 
and conditions. This is somewhat more complicated and may still be 
modified. I presume that your comment was not intended to apply to 
this case as the last call document covered this case (inadequately, 
but that was a different question which is still being addressed.)

Pat


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Received on Thursday, 1 May 2003 11:07:59 GMT

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