I made a quick hack and after showing it to a few people at the Jena
User Conference 2006 in Bristol, it
seems it might be worth showing to people. I had this flash of
inspiration\^wthe obvious: RSS is a format that is a syndication feed of
items with (date, time, description) which sounds remarkably similar to
a calendar file such as
iCalendar ICS files produced
and consumed by calendar programs such as Apple's iCal. So I made a
program that uses Raptor's
parser to read any RSS/Atom feed into an RDF graph (*), query it with
SPARQL to grab the entries and then output it in the iCalendar format.
Most of my time was spent dealing with the baroque \-escaping of the
result format, and trying to get the RSS dates to work; even with the
help raptor gives using curl's
curl_parsedate to uplift from RSS date
(Of course this feed is proper RSS 1.0/RDF so the
is not necessary; I could use raptor's guess parser to do the right
I tried it on some other feeds in the wild too and it mostly worked but it looks like there are some other bugs to shake out. I'm interested to what people think of this as an alternative interface to the River of News format. It allows you to skim a bit easier in your calendar and to see when news items arrived. I'm not sure if I'll run it as a PlanetRDF service yet.
(*) This means with a slight modification, it could do an aggregated calendar if I loaded in multiple feeds.