> how do you know how often to poll? I would guess a combination of frequency from sitemap.xml, last modified http header, and past heuristics. Previously view

> how do you know how often to poll? I would guess a combination of frequency from sitemap.xml, last modified http header, and past heuristics. Previously viewed items would, I think, need to be cached in the client (unless the RSS URL uses some kind of token to identify the user, which sounds ripe for abuse).