By default Nucleus supports XML-RSS Syndication. Nucleus version 1.55 this is RSS version 0.91. As of version 2.0 of Nucleus both RSS 0.91 and RSS 2.0 will be supported.
Pie/Atom/Echo is a proposed replacement for RSS. There is an experimental skin available that lets Nucleus generate Atom 0.2 feeds.
Insert long text and external references for syndication here!
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