How can I monitor the other website?

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Because they publish their metadata scheme and the pages they publish and what metadata those pages relate to as an XFML file.

(Note: These slides are written with Radio's outliner tool BTW, very cool technology. Check out OPML as well.)

XFML publishes, for anyone to see, what metadata you have on your site (categories, subcategories, faceted metadata), and how pages of your website relate to that website