In an article I'm working on I refer to Norm Walsh's piece Embedded
Harmful and his
follow-up "Escaped Markup: What To Do
Instead". I've always
urged people to use
type="xhtml" in Atom rather than
do the tidying to XHTML in the aggregation processing stage, and my
arguments largely line up with Norm's.
From a comment by Dan Connolly I also found this older XML.com article with the same title as Norm's: "Embedded Markup Considered Harmful" by Theodor Holm Nelson. I can't make much sense of what Mr. Nelson is saying. Can you?