Using XDR Schemas
As mentioned, XML-Data Reduced (XDR) schema validation is the result of a Microsoft implementation of an early draft of what today is XSDs. XDR was implemented for the first time in the version of MSXML that shipped with Microsoft Internet Explorer 5.0, back in the spring of 1999.
In the XDR schema specification, you’ll find almost all of the ideas that characterize XSDs today. The main reason for XDR support in the .NET Framework is backward compatibility with existing MSXML-based applications. To enable these applications to upgrade properly to the .NET Framework, XDR support has been retained intact. You will not find XDR support anywhere else outside the Microsoft Windows platform, however.
If you have used Microsoft ActiveX ...
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