If it helps, I was just digging into something like that last week. They’re a bit more tutorial/step-by-step than delving into raw code, but relatively workable for creating custom feeds.
A reply to Greg McVerry on custom RSS feeds
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Chris Aldrich
I'm a biomedical and electrical engineer with interests in information theory, complexity, evolution, genetics, signal processing, IndieWeb, theoretical mathematics, and big history. I'm also a talent manager-producer-publisher in the entertainment industry with expertise in representation, distribution, finance, production, content delivery, and new media. View all posts by Chris Aldrich