Re: [xml-dev] How to redesign W3C XML Schema (Water Contract)

["Rick Jelliffe" <ricko@allette.com.au>]

From: "Mike Plusch" <mplusch@clearmethods.com>

> If folks are looking for an XML schema that:

> 2. Simpler than Relax NG or Schematron
...
> I recommend folks look at Water Contract.
> http://www.waterlang.org/water_book_2002/ch05.pdf
 
?? If Water Contract is simpler than Schematron, it is only because
apples are simpler than oranges.  

For example, here is a typical Schematron pattern (untested), that the number
of columns in any table should not exceed the cols attribute:

<rule context="tr">
    <assert test="count(td) &lt;= ../table/@cols">
    The number of columns in a table should not exceed the number in the cols attribute.
    </assert>
</rule>

What is the equivalent in Water Contract, and why is it less complex to anyone
who already knows XPaths?   

... (much fulminating deleted)

Cheers
Rick Jelliffe