Newsfeeds

I’ve come across a problem I don’t know how to solve.

I want to publish a newsfeed with articles at a secondth
nesting level.

For example, have the top level newsfeed nodes be the
days of the month, then have a list the articles as nodes
published at the second level.

2007-04-01
article1
article2
article3
2007-0-4-02
article1
article2
2007-0-4-03
article1
article2

… and so on

Ive been told this could be accomplished using OPML

Anybody knows of someone doing something like
this in Ruby using OPML, Atom or something else

Your comments will be greatly appreciated, thanks


Uma G.