One of the reasons for proposing PaceExtensionConstruct [1] was to allow existing RSS extensions and RDF properties to be used in Atom.
If we have no model for extension elements, other than that they are bits of opaque infoset hanging in specific but meaningless places, then it seems that we need to redefine all existing extensions for use in Atom on a case-by-case basis. This thread seems to confirm that. Is that the best that we can come up with? [1] http://www.intertwingly.net/wiki/pie/PaceExtensionConstruct -- Dave
