Adobe Flex4 mxml schema

Is there a MXML schema xsd given by the latest Flex4 distribution? I found from the old release notes that :

Flex includes an XSD file that you can integrate with your third-party editing tools for schema validation and easier MXML coding. This file is开发者_StackOverflow installed in the following location: {install.dir}/extras/schema/mxml.xsd

There don't seem to be any extras included with the Flex 4 SDK, but some poking around turned up this project to automatically generate the mxml.xsd. It's geared towards Flex 3, but could be extended to Flex 4 if need be.