RE: [xml-dev] Restrictions on existence of attributes?

["Michael Kay" <mike@saxonica.com>]

> 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/