Enable the creation of comment feeds (comments on an entry from another feed) and the atomization of other hierarchical data, such as discussion forums, without recursion, by adding "comments" to the lin/@rel registry, and allowing atom:content and atom:summary as children of atom:head.
Comments on weblog entries and comment feeds are a reality today. Atom does not currently have a good way to support them.
Other hierarchical data that is sometimes syndicated could use a good method of representation using Atom.
This method enables this while preserving the simplicity of a flat feed model.
In section 4.2 of draft-ietf-atompub-format-05.txt, add the following to the lists of child elements of atom:head:
atom:head elements MUST NOT contain more than one atom:summary element.
atom:head elements MUST NOT contain more than one atom:content element.
Add the following to section 4.6.2:
The value "comments" signifies that the URI in the value of the href attribute identifies a resource containing comments on the content of the containing atom:feed or atom:entry element. For example, the URI may identify another Atom feed document whose entries are comments about the containing atom:entry.
Consumers may wish to handle content and summaries at the feed level, and another link/@rel value.