RE: [xml-dev] What kind of content is allowed in simple types & simple content?

> XSD does not constrain comments or PIs. So it is valid to 
> have them even
> in simpleType content. However, it is not considered a good 
> practice...

... by vendors of database products (and data binding products) that have
difficulty in coping with them.

Stick to native XML technologies, and you should be fine.

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