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XML Script and XML-Script are two unrelated XML technologies. The former (XML Script) is an XML transformation language, while the latter (XML-Script) is a Microsoft technology preview for scripting web browsers, or an XML version of ECMAJavaScript. Microsoft is expected to rename XML-Script to Atlas Script before its first release.
References
"Error: ASP.net". The Official Microsoft ASP.NET Site. Retrieved 2023-10-24.