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   SAX Topic 2004-0003: Unicode normalization

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  • To: XML Developers List <xml-dev@lists.xml.org>
  • Subject: SAX Topic 2004-0003: Unicode normalization
  • From: David Megginson <dmeggin@attglobal.net>
  • Date: Sun, 22 Feb 2004 09:28:35 -0500
  • User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040122 Debian/1.6-1

* Topic 2004-0003: Unicode normalization

- add a feature to request Unicode normalization checking (John Cowan,

- add a read-only feature to indicate that the current document is
   normalized (John Cowan, 2004-02-18); not needed, because if no
   error() is reported after normalization is requested, document is
   normalized (Norm Walsh, 2004-02-20)

- add a feature to XMLReaderFactory, such as
   http://xml.org/sax/features/unicode-normalization-checking; most
   appropriate at the factory level (Norm Walsh, 2004-02-19); Jeff
   Rafter (2004-02-19) and Elliotte Rusty Harold (2004-02-19) disagree;
   Norm wants feature in factory so that factory can return different
   parsers (2004-02-20)

- unicode-normalization-checking should be false by default (Elliotte
   Rusty Harold, 2004-02-19)

- errors should be reported through the error() callback (Elliotte
   Rusty Harold, 2004-02-19); Norm Walsh agrees (2004-02-20); using
   error() instead of warning() may cause too much noise (Jeff Rafter,
   2004-02-20); should error() or warning() be called only on the first
   problem? (Jeff Rafter, 2004-02-20)

- may want to standardize an exception subtype for normalization
   errors (Elliotte Rusty Harold, 2004-02-19); Norm Walsh agrees

- feature should be in XMLReader, not in the factory (Jeff Rafter,
   2004-02-19); Elliotte Rusy Harold agrees (2004-02-19);

- normalization transcoding may be a useful feature (Jeff Rafter,
   2004-02-19); that's application-level functionality that belongs in
   a layer above SAX (Norm Walsh, 2004-02-20); could also argue that
   validation is application-level functionality (Karl Waclawek,
   2004-02-20); Jeff Rafter agrees, pointing to separate validating and
   non-validating AElfred parsers (2004-02-20)

All the best,



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