Topic Topology Group Topics
All groups in a topic will inherit group parameters from the parent (and ancestor) topic parameters. All valid group parameters are valid topic parameters (see Group Parameters).
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
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
(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 `
score file. If you enter the group `
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
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.