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Re: PIs considered harmful Was: XML-SW, a thought experiment

From: Elliotte Rusty Harold <elharo@metalab.unc.edu>
Date: Wed, 13 Feb 2002 11:08:16 -0500
Message-Id: <p04330106b8903ef211ec@[]>
To: Norman Walsh <Norman.Walsh@Sun.COM>
Cc: "'www-tag'" <www-tag@w3.org>
At 4:40 PM +0100 2/13/02, Jacek Kopecky wrote:
>  Norm,
>  had the DocBook schema been designed to allow for arbitrary
>extensibility in an other namespace, the added element (or
>attribute) would be the solution. Look at HTML - it ignores
>unknown tags. In XML we could ignore unknown elements from
>unknown namespaces _and_ their contents as well, of course.

Consider this position not from the perspective of Norm, who wrote 
most of the DocBook DTDs and stylesheets, but from my perspective, an 
interested user but one who hasn't had any real involvement ion the 
development of DocBook. Can I change DocBook to make it more 
extensible to arbitrary namespaces? Should I? Should I have to to be 
able to add my own unique processing information to my own DocBook 

Processing instructions are necessary because we need to add this 
information to documents written in XML vocabularies we do not 
control and cannot change. Perhaps schema languages should be written 
in a more permissive fashion so that they automatically allow 
anything from other namespaces. Everything not forbidden is 
permitted. However, that is not how either DTDs or the W3C XML Schema 
Language is written. Consequently we need processing instructions.

| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
|          The XML Bible, 2nd Edition (Hungry Minds, 2001)           |
|              http://www.ibiblio.org/xml/books/bible2/              |
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Received on Wednesday, 13 February 2002 11:19:59 UTC

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