ref: 38c2cdf164f0cc12db65f9f51b3b4a7815543d12
dir: /sys/src/cmd/hg/templates/rss/filelog.tmpl/
{header} <title>{repo|escape}: {file|escape} history</title> <description>{file|escape} revision history</description> {entries%filelogentry} </channel> </rss>