I've had a request to add <author> to our RSS 2.0 feeds. Problem is, its a wacky element - it seems to require us to *only* use an email address - i.e., I can't sub in a display name, a real name or anything else that might otherwise point to a person - username@hostname.tld appears to be the only valid input.

Is this an accurate interpretation of the spec? What will I break when Blogware starts ignoring this requirement and uses "Display Names" instead?

<author> sub-element of <item> 

<author> is an optional sub-element of <item>.

It's the email address of the author of the item.