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Re: SAX2: summary of Namespace-support arguments

  • From: "Rick Jelliffe" <ricko@a...>
  • To: "XMLDev list" <xml-dev@i...>
  • Date: Sun, 19 Dec 1999 15:51:21 +0800

Re: SAX2: summary of Namespace-support arguments
 From: James Clark <jjc@j...>

 >I do indeed want that, and in the past I've argued against *requiring*
>processors to provide information about the prefix used. I've become a
>lot less negative about this prefix information recently and I think
>it's better for an API to provide it

Isn't it a requirement for XSL?  In XSL, if two elements have the name
namespace but different prefixes, they are processed differently (at
least, for the XSL namespace itself).

This is essential for XSL scripts that generate XSL.  This cannot be
done if either the prefix is lost or unless some other arrangement
(e.g. adding some attribute giving an instance number) is used.

Also, prefixes form part of the markup.  They should have documentation
meaning.   I think it is bad if the "rdf": prefix were to be replace by
"xyz" or, worse, by some prefix generated at random like "dom".   So,
like document-entity encoding, prefixes do not form part of the
canonical
information set of the document but they do form part of the pragmatic
information set required for round-tripping.

Different instances of the same document are required for programming
languages that use XML syntax and which allow namespaced elements
as data.  Prefix-preservation is required for this. Prefix-preservation
is also required for round-tripping.

Rick Jelliffe


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