I have that pattern - we have users who have multiple websites, the
list of sites is a feed and managing sites is a post to the feed.
Turns out that Atom is "sort of" closed under these operations.
Bill
James M Snell wrote:
The way we've implemented this in Connections is pretty simple and
effective. We essentially have the concept of a
collection-of-collections -- an atompub collection whose entries each
represent a collection. Within each of the atom:entry elements is an
app:collection element. Create a new collection by posting an entry.
Edit the collection metadata by putting to the edit uri. Each
collection has an entry URI and a collection feed URI.