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RE: Validness, doctype, and Schema Instance

• To: "'Jeff Rafter'" <lists@j...>,"'Frans Englich'" <frans.englich@t...>
• Subject: RE: Validness, doctype, and Schema Instance
• From: "Michael Kay" <mike@s...>
• Date: Thu, 18 Nov 2004 17:12:39 -0000
• Cc: "'XML Developers List'" <xml-dev@l...>
• In-reply-to: <419CCA3C.2040907@j...>
• Thread-index: AcTNibhUZlmm+uxkQzSMKTHi7vkEnAABzm5g

> 
> This is perfectly legal-- however there are a lot of situations where 
> the validity of a document is assumed by a business process. 
> For example 
> you and a trading partner are passing documents back and forth-- that 
> trading partner assumes your document is constructed according to an 
> agreed on DTD-- validity insures this.

Actually, trading partners invariably require more than validity. Validity
does NOT ensure conformance to "an agreed on DTD". A document is valid if it
conforms to any old DTD that it happens to reference.

This is a real practical problem because most XML parsers don't give you an
easy way of validating an incoming document against a specific DTD.

Michael Kay

• References:
  • Re: Validness, doctype, and Schema Instance
    • From: Jeff Rafter <lists@j...>

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