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RE: Restrictions on existence of attributes?

• To: "'Eric van der Vlist'" <vdv@d...>,<xml-dev@l...>
• Subject: RE: Restrictions on existence of attributes?
• From: "Michael Kay" <mike@s...>
• Date: Wed, 28 Jun 2006 10:32:48 +0100
• In-reply-to: <1151476826.29266.28.camel@l...>
• Thread-index: Acaafeko7P0qkSmKRKqWKyPqLBrfWAAFryFA

> 1) the error messages that you get when there are several 
> attributes would be misleading for end users

That doesn't seem a convincing argument. Saxon says:

Validation error on line 1 column 20 of file:/c:/temp/test.xml:
  Identity constraint {uniqueAtt}: the field selects more than one node (See
  http://www.w3.org/TR/xmlschema-1/#cvc-identity-constraint clause 3)

Not exactly ideal for "end users", but it's no more obscure than the error
messages for many other validation errors. 

> 2) W3C XML Schema processors differ in their interpretation 
> of the spec on this point and this leads to interoperability issues.

That's an even less convincing argument. If a schema processor doesn't
conform to the spec, then don't use it.

Michael Kay
http://www.saxonica.com

• Follow-Ups:
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    • From: Robin Berjon <robin.berjon@e...>
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    • From: Eric van der Vlist <vdv@d...>

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  • RE: Restrictions on existence of attributes?
    • From: Eric van der Vlist <vdv@d...>

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