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   Draconian error handling (was Re: XML syntax )

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  • From: "Rick Jelliffe" <ricko@allette.com.au>
  • To: <xml-dev@ic.ac.uk>
  • Date: Wed, 17 Dec 1997 07:06:22 +1100

 From: james anderson <mecom-gmbh@mixx.de>

>my problem is, whenever i come to a point in the proposed recommendation at
>which a parser is required to report an error and "must not continue normal
>processing" even though the result which the stream would denote would be
>sufficiently unambiguous if allowed, then i feel compelled to ask, "why does one
>have to exclude this"?

The requirement for "Draconian error handling" actually came from the HTML
side not the SGML people.  The reason was to ensure data integrity:
if a document was compromised it should be clearly marked as such when
passed to the application.  Under no circumstances should something that
is not well-formed be passed to an application as if it were.

This is because XML is intended for more than just typed-text applications.

It was thought that allowing all sorts of transparent error-recovery 
mechanisms would just reintroduce tag minimization in through the back
door.  Then people would start to rely on it, or at least write their
XML to suit the error-recovery of particular parsers, and we would
be back in HTML-land, where the effective grammar is too loose to
be reliable.

Rick Jelliffe

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