group capabilities for rss aggreation

[MichaelLenczner]

Once groups of nodes exist (http://dev.wifidog.org/ticket/246) then the next request is to allow managment of rss aggregation for groups.

2 things: 1) a portal page being able to combine a network rss feed with a node rss feed and display entries by date.

2) managing rss subscriptions for groups. (this should actually be a part of rfe 246).

This way a portal page could display an aggreated / combined feed information by date of network wide content, group-targed content, and node-targted content.

[benoitg]

Now that we have two pass content display, this is actually possible (and even "easy") to implement even without #246. We'd need to implement two content types: One is a feed accumulator item, which would basically just be a feed URL (initially without BIAS, otherwise, it would be way to easy for someone to hog it). The second would be a feed accumulator, which is basically the current aggregator, without items. Accumulator items would add themselves to the accumulator during the prepare phase, and the accumulator would display them.

Off course, this in no way solves true content grouping.