• To: "'Rick Jelliffe'" <rjelliffe@a...>,<xml-dev@l...>
• Subject: RE: Restrictions on existence of attributes?
• From: "Michael Kay" <mike@s...>
• Date: Thu, 6 Jul 2006 09:07:23 +0100
• In-reply-to: <44ACB442.3020302@a...>
• Thread-index: AcagznTNmlLIFJTpQymvsH36rcC4KwABFYHQ

> a toolmaker could easily make a system that checks whether one 
> RELAX NG schema is a restricted or xsd-style extension of 
> another. 

I disagree. Just because month has the value-set 1..12 and percentage has
the value-set 1..100 does not mean that month is a subtype of percentage.
Subtyping is a semantic relationship, not merely a syntactic one.

Michael Kay
http://www.saxonica.com/

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