I am looking for the XSD schema of RSS. Via Wikipedia I have found several pages on the specifications of RSS 2.0 but none offers an XSD schema. I found several correct xsd files around on the web but all these schemas are created by individual developers. I'm surprised not to find a site official RSS 2.0 specification and provides a formal XSD.

Do you know where I can find a perfect match of the official XSD schema for RSS 2.0?