Can I use custom Document Information Panel with SharePoint services (not MOSS)

I know it is possible by using MOSS + InfoPath to create and use custom Document Information Panel.

However is it possible to write custom InfoPath XML schema and then add it t开发者_如何学运维o Content Type definition programmatically or declaratively... Is that possible? Maybe somebody tried something like that?

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Yes. Here's a video on Channel 9.