freejung - 9:23 pm on Jun 2, 2011 (gmt 0)
This could be very important.
Of particular interest are the WebPage and WebPageElement types, allowing you to specifically mark up breadcrumbs, nav, header, footer, sidebar, main content etc. Seems like they would have to take this data with a grain of salt to prevent abuse, for example marking an obscure paragraph in tiny text at the bottom of the page as the "main content" of the page. We probably want to be very careful to mark up elements accurately, as discrepancies could be seen as a signal of spam.
I plan to make it standard procedure to use this markup schema in all of my templates.