Topic Parameters ---------------- All groups in a topic will inherit group parameters from the parent (and ancestor) topic parameters. All valid group parameters are valid topic parameters (Note: Group Parameters). In addition, the following parameters are only valid as topic parameters: `subscribe' When subscribing new groups by topic (Note: Subscription Methods), the `subscribe' topic parameter says what groups go in what topic. Its value should be a regexp to match the groups that should go in that topic. Group parameters (of course) override topic parameters, and topic parameters in sub-topics override topic parameters in super-topics. You know. Normal inheritance rules. ("Rules" is here a noun, not a verb, although you may feel free to disagree with me here.) Gnus Emacs 3: comp.emacs 2: alt.religion.emacs 452: alt.sex.emacs Relief 452: alt.sex.emacs 0: comp.talk.emacs.recovery Misc 8: comp.binaries.fractals 13: comp.sources.unix 452: alt.sex.emacs The `Emacs' topic has the topic parameter `(score-file . "emacs.SCORE")'; the `Relief' topic has the topic parameter `(score-file . "relief.SCORE")'; and the `Misc' topic has the topic parameter `(score-file . "emacs.SCORE")'. In addition, `alt.religion.emacs' has the group parameter `(score-file . "religion.SCORE")'. Now, when you enter `alt.sex.emacs' in the `Relief' topic, you will get the `relief.SCORE' home score file. If you enter the same group in the `Emacs' topic, you'll get the `emacs.SCORE' home score file. If you enter the group `alt.religion.emacs', you'll get the `religion.SCORE' home score file. This seems rather simple and self-evident, doesn't it? Well, yes. But there are some problems, especially with the `total-expiry' parameter. Say you have a mail group in two topics; one with `total-expiry' and one without. What happens when you do `M-x gnus-expire-all-expirable-groups'? Gnus has no way of telling which one of these topics you mean to expire articles from, so anything may happen. In fact, I hereby declare that it is "undefined" what happens. You just have to be careful if you do stuff like that.
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