RE: [xml-dev] choosing elements based on attribute values

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

> 
> Just trying one last time:
>  
> > I use W3C schema 1.0. I need to make an element or set of elements 
> > mandatory or optional based on the attribute value as below:

It's a well-known restriction of XML Schema 1.0 that this can't be done.

It can be done in XML Schema 1.1. Saxon 9.0 which appeared a couple of weeks
ago is probably the first product to have any support for XML Schema 1.1
features - it implements assertions, which are certainly powerful enough for
this. 

But if you don't want to be at the bleeding edge, the answer is that it
can't be done.

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