Marc, Thanks for your comment (and for your very interesting blog as well). I looked at http://www.imc.org/pdi/ to get familiar with iCalendar, which I had not heard of or associated with vcard or vcalendar before your note. So I am not well-versed.

I see no reason why parts of the iCalendar schema could not replace ESF, at least in concept. Perhaps the authors of ESF weren’t aware of iCalendar, or if they were, envisioned ESF as sufficiently simple that writing it as an RSS extension from scratch would be easier and more consistent with the RSS philosophy of keeping things simple.

But your point is a good one; maybe instead of writing all these new RSS extensions from scratch there’s benefit in reconciling all of these open standards, and benefitting from all the thought that has gone into prior efforts that for unrelated reasons didn’t take off?

I’d be curious to learn what the ESF authors have to say to your question.

Cesar, thanks for posting this. I don’t mean to be obtuse, but what does this standard do that the iCalendar format doesn’t already do?