RE: Mixed content and empty content

> Empty is a special case of element-only content, and whitespace is always
> allowed in element-only content. I think.

XML Schema 1.0, section 3.4.4, clause 2.1 states that if the {content type}
of a complex type is empty(which is the case for an empty <xs:complexType/>
declaration with mixed="false") then the element being validated may have no
character or element information item [children] at all, which sounds like
it explicitly excludes whitespace.  So <foo/> and <foo></foo> would both be
valid, but not <foo> </foo>. 
 
Thanks for the correction. Shouldn't try to answer questions from memory.
 
Michael Kay
http://www.saxonica.com/