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i've created a bespoke cms/blogging tool for my own site using php and mysql. i'm currently using a php function to generate an rss 2.0 feed - containing the 12 most recent posts - whenever i add a new post. all seems to be working fine, and the feed validates.
my question is this: what is the accepted method with dealing with edited or deleted posts? if i edit a post, this will call my function again, but obviously my original post will be sitting in someone's reader. is there a way of flagging this as an updated post or something? and what about a publish date? do i create a new publish date, or should i continue with the original publish date, or is there an rss 2.0 tag like rePubDate or something?
i just can't seem to find any general advice relating to the fact that you may want to change your feed in some way rather than just adding to it. i can't imagine that it's possible to recall a feed, so surely there is an accepted 'best practice' for when this situation arises.
any advice, help or links to some guides on this would be greatly appreciated. thanks in advance.