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A comment on I've been advocating for RSS support, and you should too. Parent comment

Re:I've been advocating for RSS support, and you should too by fire_lake on Saturday January 18, 2025 @11:14AM (#42749357)
> Which items you have seen previously is something the feed reader keeps track of.

Is there a particular field that can be used as an identifier?

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Re:I've been advocating for RSS support, and you should too by asjo on Sunday January 19, 2025 @05:04AM (#42755656)
Yes, the `guid` field in RSS and the `id` field in Atom.
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Re:I've been advocating for RSS support, and you should too by account42 on Monday January 20, 2025 @06:36AM (#42767611)
A lot of readers (intentionally?) get this wrong though and show entries as new/unread if there are changes to the content.

Of course a lot of feeds also get this wrong and change the GUIDs for existing entries once in a while which results in strictly compliant readers showing you the entire feed history as new. Really annoying.

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Re:I've been advocating for RSS support, and you should too by asjo on Tuesday January 21, 2025 @11:22AM (#42781873)
My system updates¹ the entry and marks the changes in the first case. What is right and what is wrong depends on what you want, I think.

The latter is annoying, I agree.

¹ It is an NNTP interface so the article is superseded; https://feedbase.org/about/ - if you don't want to see updates, you can configure your newsreader to skip supersedes.

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