nx_atom_v1.nx

atom.nx -- Atom 1.0 feed builder (RFC 4287). Modern alternative to RSS 2.0. Atom's strictness (required id, updated, author; XML namespaces; RFC 3339 dates) makes it cleaner for programmatic parsing. Google, NetNewsWire, and many news APIs prefer Atom. Nishi-pages should emit both -- RSS for universal compatibility, Atom for correctness. Feed skeleton: <?xml version=\"1.0\" encoding=\"utf-8\"?> <feed xmlns=\"http://www.w3.org/2005/Atom\"> <title>...</title> <link href=\"...\"/> <id>...</id> <updated>2026-04-22T12:34:56Z</updated> <author><name>...</name></author> <entry> <title>...</title> <link href=\"...\"/> <id>...</id> <updated>...</updated> <summary>...</summary> <content type=\"html\"><![CDATA[...]]></content> </entry> </feed> Dates: ISO 8601 (iso8601.nx) -- RFC 3339 is the Atom-specified subset. HTML content: CDATA wrap, same convention as rss.nx. Invariants: A1 id must be a stable tag: URI or URL. Caller supplies; we emit as-is (escaped). A2 updated is required at both feed + entry level; we require it rather than defaulting. A3 Stream builder: atom_begin -> atom_entry* -> atom_end.