Version and Conformance
The following table provides a brief history of highlighted changes in each of the released versions of Microsoft XML Core Services (MSXML). It will help you see how MSXML has evolved over time to implement schema support and conform to the XML standards for schema use.
Only DTD support provided. No support for schemas.
MSXML 2.0 through 4.0
Support for XML-Data Reduced (XDR) schemas.
MSXML 4.0 and later
Support for XML Schema definition language (XSD) schemas.
MSXML 5.0 for Microsoft Office Applications
Support for inline XSD schemas.
Support for XML-Data Reduced (XDR) schemas has been removed.