RE: [XML Schema 1.1] Does mode="none" on a subtype nullify the openness of its parent type?

>  
> Thanks Michael. So, by putting mode="none" on a subtype it is 
> only prohibiting extension elements from being inserted 
> around the subtypes' elements; extension elements can still 
> be inserted around the parent type's elements. Is that correct?

No!

The content of an element is validated either against the parent type P or
against the subtype S. If it's validated against P then "extension" elements
are allowed; it it's validated against S then they aren't. Which type is
used for validation depends on the type defined in the element declaration
and/or the value of xsi:type on the instance.

Regards,

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