Getting possible root values from XML schema ?

[a\.desentenac]

I validate a XML file against a XSD, and when the root node of
the XML is invalid, I'd like to get the possible valid values.
Is that possible without using a parser to parse the XSD as a
XML file and get the children of the schema element ?

For every other element of the XML I get the XSModelGroup from
its parent type definition and find the possible
XSElementDeclarations, but that clearly is not possible for
the root element, since it has no parent !

Thanks, Adrien

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