Is this allowed? ("mixed" appears on both complexType and complexContent.) 


<complexType name="ct" mixed="true">
  <complexContent mixed="false">
There doesn't appear to be any constraint saying it's not allowed.

Assuming it's allowed, the mapping rules for complexType complexContent in 2E 
state: 

[Definition:] Let the effective mixed be the appropriate case among the 
following: 
1 If the mixed [attribute] is present on <complexContent> then its actual 
value; 
2 If the mixed [attribute] is present on <complexType> then its actual value; 
3 otherwise false. 
Now both 1 and 2 apply. Which one should be used? (I think the intention is 
that "mixed" on <complexContent> takes precedence. In that case, we at least 
need an "otherwise" in clause 2 above.) 

See
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2003JanMar/0039.html