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I will appreciate any answer on my questions...
Thanks in advance.
How you will update it depends on the answers to my original questions. I believe that some CM software has feed generation capabilities built in and there are a number of options right through to hand coding your rss files in Notepad.
1.When i complete my code for rss (and upload it on my server), i have to create rss files for every category with some default articles in it? When a user publish an article it's better to update the current rss for this article's category or replace it with a new rss file with this only one article in it?
I think you've figured this out, but you'd want more than one article in a feed. I have some feeds with hundreds of items in them. It's up to you and the frequency of your updates.
An other question i have is if a user subscribe to an rss, lets say just with firefox, how and when firefox will inform the user for a new update?
Which tag i have to use for update frequency?