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Session on mime types and fragids

From: Jeni Tennison <jeni@jenitennison.com>
Date: Tue, 31 May 2011 23:33:32 +0100
Message-Id: <86CD77ED-070A-4490-B5C8-35187B66DC22@jenitennison.com>
To: "www-tag@w3.org List" <www-tag@w3.org>
Hi,

We're due to have a session on mime types and fragids at the F2F next week. Below is the intended agenda and background reading (it looks a lot but is mostly either short sections within larger documents or 'just enough to get the gist').

Cheers,

Jeni

---
AIMS

  - make decision on direction we take on RDFa Core (ACTION-509)
  - agree text for MIME and the Web draft on fragids (ACTION-543)
  - make decision (again) on direction we take on 3023bis (application/xml)
  - identify other actions to resolve fragid issues

AGENDA

1. Current specifications
  - URI spec
      http://tools.ietf.org/html/rfc3986#page-24
  - AWWW
      http://www.w3.org/TR/2004/REC-webarch-20041215/#fragid
      http://www.w3.org/TR/2004/REC-webarch-20041215/#internet-media-type

2. Emerging practice and opportunities

 a. New XML mime type definition
    - 3023bis [DRAFT]
        http://www.w3.org/2006/02/son-of-3023/draft-murata-kohn-lilley-xml-04.html#frag
    - XPointer framework
        http://www.w3.org/TR/2003/REC-xptr-framework-20030325/

 b. Hashbangs
   - HTML mime type definition
       http://www.rfc-editor.org/rfc/rfc2854.txt
   - XHTML mime type definition
       http://www.rfc-editor.org/rfc/rfc3236.txt

 c. Images and video
   - media type fragments [DRAFT]
       http://www.w3.org/TR/2011/WD-media-frags-20110317/
   - SVG mime type definition [DRAFT?]
       http://www.imc.org/ietf-xml-mime/mail-archive/msg01153.html

 d. Semantic web
   - application/rdf+xml mime type definition
       http://www.ietf.org/rfc/rfc3870.txt
   - RDFa core
       http://www.w3.org/TR/2011/WD-rdfa-core-20110331/
   - Turtle [to be updated by RDF WG]
       http://www.iana.org/assignments/media-types/text/turtle
   - N3 [submission]
       http://www.w3.org/TeamSubmission/2011/SUBM-n3-20110328/#sec-mediaReg
   - N-triples
       http://www.w3.org/TR/2004/REC-rdf-testcases-20040210/#ntriples
   - Manchester OWL Syntax [NOTE]
       http://www.w3.org/TR/2009/NOTE-owl2-manchester-syntax-20091027/#Appendix:_Internet_Media_Type.2C_File_Extension_and_Macintosh_File_Type

3. Discussion

  a. Under 3023bis rules, SVG cannot specify support for media type fragments
     - is this a problem?
     - should SVG have a non-+xml media type so that it can?
     - should 3023bis allow +xml media types to support other fragment id syntaxes?

  b. Under 3023bis rules, any application/xml or +xml document's fragments must indicate XML elements
     - what fragids can an RDFa XML document use and be consistent with 3023bis?
     - what fragids can an XHTML document use and be consistent with 3023bis?
     - should 3023bis allow +xml media types to define fragids that point to things other than XML elements?

  c. In practice, does it matter what the mime type definitions say?
     - how do applications work out what fragment identifiers to interpret?
     - what happens when applications interpret additional fragment identifiers?
       (eg if an image rendering application applied media type fragments to SVG)
     - what happens when different applications interpret fragment identifiers differently?
       (eg if an XML processor interprets #me as an error, RDF processor as a Person)

  d. What additional guidelines or rewriting is needed
     - to 3023bis
     - to RDFa Core
     - to RDF Concepts?
     - to AWWW
     - to URI spec
     - to 'how to define fragment identifier semantics'
     - to IETF or W3C processes?

4. Decisions and action assignment

OTHER READING

- Previous decisions on 3023bis
    http://www.w3.org/2001/tag/2010/06/08-minutes.html#item01
    http://lists.w3.org/Archives/Public/www-tag/2010Jun/0125.html
    http://lists.w3.org/Archives/Public/www-tag/2010Nov/0078.html

- Proposal for mime type fragid section by Jeni (ACTION-543)
    http://lists.w3.org/Archives/Public/www-tag/2011May/0000.html

- Summary of issues around 3023bis and impact on RDFa and other specs
    http://lists.w3.org/Archives/Public/www-tag/2011May/0027.html
-- 
Jeni Tennison
http://www.jenitennison.com
Received on Tuesday, 31 May 2011 22:33:58 GMT

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