[EXI] ComplexType with mixed="true"

Hi EXI experts
            In the specification the grammar derivation rules for a schema
with ComplexType having mixed="true" are not specified. 
            Adding a CH production for accepting string content to all LHS
Nonterminals of the 'Type' grammar would suffice for this ? Or if the method
is different please share your knowledge.
 
regards
Santhanakrishnan