This morning it "came to me" how to do feeds in the world outline. And it wasn't too hard to implement either (that was how I was sure I had the right answer).
What's in the feed: Nodes of type blogpost or howto, and perhaps others in the future.
They appear in reverse chronologic order of course.
There are at most 20 of them.
The generating of the RSS happens on the workstation, as the OPML is being generated and it is uploaded along with the OPML. This helps with scaling. The server only acts as a pass-through. It moves the RSS text to the S3 storage system.
The address of my feed is: