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   RE: SAX2 Namespace Support

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  • From: "Hunter, David" <dhunter@Mobility.com>
  • To: 'David Megginson' <david@megginson.com>, xml-dev <xml-dev@ic.ac.uk>
  • Date: Thu, 6 Jan 2000 10:37:06 -0500

From: David Megginson [mailto:david@megginson.com]
Sent: Wednesday, January 05, 2000 6:58 PM

> > The problem though boils down to how often, in reality, XML 
> instances 
> > will have the same Namespace declared twice, with different 
> prefixes.
> The fact that the bug would be rare makes it worse -- an application
> will run perfectly for, say, 18 months, then will suddenly and
> inexplicably blow up long after the original programmers have moved on
> because one input document happened to declare the same NS twice and
> the programmers didn't build in error recovery for that problem.

I don't want to flog any dead horses, so I hope this hasn't been covered
already, but is it really an error to have the same namespace declared
twice, with different prefixes?  i.e., is the following really not legal

<tag xmlns:p1="urn:person:000-000-000"

And, if that is illegal, is the following legal:

<tag xmlns="urn:person:000-000-000"

I looked through the Namespace spec, but couldn't find anything making this
illegal, so did I miss something, or did I misunderstand the conversation?
(Both equally likely.)

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