bill - 11:53 pm on Nov 14, 2009 (gmt 0)
Which tag i have to use for update frequency?
Have you followed the RSS 2.0 specs [cyber.law.harvard.edu]? There are several optional channel elements that may affect update frequency. The ttl, skipDays and skipHours elements let publishers offer guidance regarding a feed's frequency of updates. However, support for ttl is arguably sparse with most feed readers/aggegators. So you can suggest an update frequency, but don't count on everyone following that suggestion the same way.