2.1.8 [W3C-XSS] Section 4.2.3, References to schema components across namespaces

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V0009:

The specification states:

 Note: Since both the namespace and schemaLocation [attribute] are optional, 
 a bare <import/> information item is allowed. This simply allows unqualified 
 reference to foreign components with no target namespace without giving 
 any hints as to where to find them.

MSXML6

An unqualified reference results in an invalid schema document.