[This sample code uses features that were implemented only in MSXML 6.0.]
As an extension of the IXMLDOMDocument2 interface, the IXMLDOMDocument3 interface supports two additional methods, importNode and validateNode. The first one can be used to clone a node from an XML DOM object of different threading model. The second method performs run-time validation of a specified DOM fragment against the currently loaded document type definition (DTD), schema, or schema collection.
With a pointer to this interface, you can access all the methods and properties of the IXMLDOMDocument2 interface.
Header and IDL files: msxml6.h, msxml6.idl
For version-specific GUID and ProgIDs, see GUID and ProgID Information.
Implemented in: MSXML 6.