Micro XSD for Micro XML?

Now we have 'Micro XML', can't have a Micro XML Schema (Micro XSD)?

What would it be?
 no namespaces means no imports for a start
...

What would be its role, since the schema might not necessarily be readable
in all parsers capable of parsing Micro XML? Or would we want a version
of XML Schema which could be so parsed? Or would we be more likely to
recommend alternatives?

Would it be classed as an early implementation of Micro XML?

Would be now revisit the whole XML stack and recreate it or profile it for
Micro XML?

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Stephen D Green