How do I flag unread items of an RSS Feed?

Posted by Jennifer on Stack Overflow See other posts from Stack Overflow or by Jennifer
Published on 2010-03-02T02:04:08Z Indexed on 2010/05/27 17:41 UTC
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database-design

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rss

I'm trying to do a RSS reader but I have no idea on how to identify the unread items. For example what should I do when I refresh my list to prevent having duplicates?

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