Greetings again. I think we have rough consensus on "emitting with whitespace around IRIs and dates is an error" and "we should warn folks that people might emit errors here because this is somewhat subtle".
If that is true, I propose that, just before section 3.1 (at the end of the introductory text to "Common Atom Constructs") we add:
Note that there MUST be no whitespace in a Date construct or in any IRI. Some XML-emitting implementations erroneously insert whitespace around values by default, and such implementations will emit invalid Atom.
--Paul Hoffman, Director --Internet Mail Consortium
