Multiple Inheritance in XML Schema

["Ramkumar Menon" <ramkumar.menon@gmail.com>]

Gurus,

Why isn't there a straightforward mechanism for multiple inheritance
in XML Schemas?
What are the rationales for that design decision? Is it because it
adds unnecessary complexity?
I am sure there are strong reasons for this - am interested in knowing them.
Ram

-- 
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-Ramkumar Menon
 A typical Macroprocessor