ref: 347bb2a7a7110e55debd5ebe57ba03bbe315c5ba
dir: /sys/src/cmd/hg/templates/rss/changelogentry.tmpl/
<item> <title>{desc|strip|firstline|strip|escape}</title> <guid isPermaLink="true">{urlbase}{url}rev/{node|short}</guid> <description><![CDATA[{desc|strip|escape|addbreaks|nonempty}]]></description> <author>{author|obfuscate}</author> <pubDate>{date|rfc822date}</pubDate> </item>