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   Re: Parser Behaviour (serious)

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  • From: "Clark C. Evans" <cce@clarkevans.com>
  • To: Simon Wilson <Simon.Wilson@crealogix.com>
  • Date: Mon, 3 Apr 2000 11:53:23 -0400 (EDT)

On Mon, 3 Apr 2000, Simon Wilson wrote:
> Imagine if all those XML-based B2B systems out there referenced external
> entities on external web-sites. Hack the site, change or remove the DTD/schema
> and a lot of companies are losing a lot of money.
> 
> As a result, I think you'll find that most people with their wits about them
> will be taking a copy of standardized DTDs and referencing that instead in order
> to prevent such things from happening.

This is actually deeper.  What happens if 3 organizations
agree on a given DTD.  They all refer to that DTD, having
it hosted by one of the companies.  And then the hosting
company makes a slight 'clarifying' change... which happens
to cause validation of particular documents which were
considered invalid by one organization to succeed.

I think it is rather "essential" to be able to 'ovverride' 
the DTD used as a command line option; pointing it to
a local version of the DTD.

Clark




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