This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
Section 3.4.3 rule 1 says If the <simpleContent> alternative is chosen, the <simpleContent> element must not have mixed = true. I think it means to say If the <simpleContent> alternative is chosen, the <complexType> element must not have mixed = true.
The editors will endeavor to confirm that this is indeed a typo (or that it's not) and propose a fix.
A change proposal intended to resolve this issue (and others) was adopted by the XML Schema WG on 5 September 2008. http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.b5904etc.html Accordingly, I am marking the issue RESOLVED. Michael, as the originator of the issue, you can indicate your assent to the disposition of the issue by closing it, or your opposition to the disposition by reopening the issue. If we don't hear from other in two weeks, we'll assume you are content. Thank you.