[whatwg] 'Main Part of the Content' Idiom

[Smylers]

The HTML5 spec should define how to mark up the main content on a page
(even if the answer is "by omission"). This is something that many
authors ask about, the latest example being today's thread on the help
mailing list:
http://lists.whatwg.org/htdig.cgi/help-whatwg.org/2010-June/000561.html

Please could this be added to the 'idioms' section, perhaps giving
examples of when <article> or <section> might be appropriate as well as
one in which the main content is simply that which isn't in <header>,
<aside>, etc.

Thanks.

Smylers
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