I missed having expanding outlines, and I want to use the structure in interesting ways in RSS, so I decided to add a small feature to Fargo, that lets us edit outlines as they will be presented, with structure.
This blog post is an example of such an outline. As is the one you're reading right now.
In the Attribute editor (click on the Suitcase icon in the left margin) add an attribute called flMarkdown, with the value false. When you're done the atts should look like this screen shot.
The outlines are in the new source namespace. What you'll see in the feed is <source:outline>.
In 1.63 we added macro and glossary processing to the RSS feed builder, but the processing was done in the wrong place. The result is that unencoded XML could end up in description and title elements. This is not legal XML. In 1.64 we do it selectively, before encoding, only in title and description elements.