Can Microsoft's 'Longhorn' Pull it Off? Drew Marsh: "The author is so misinformed and/or confused it's pathetic. He should be fired immediately or at the very least stop covering technologies he doesn't understand. Microsoft is in no way trying to replace XSD. They have not invented a new schema language for describing the structure of XML instance documents (that's what XSD is for btw), what they've invented is a custom schema language for describing WinFS objects. That's all. In fact, the schema for describing WinFS objects is undoubtedly described by an XSD itself!"