Okay thanks, that's what I thought :) I went ahead and added the tag baire-category to a few questions and created a short tag wiki summary. Feel free to re-write it if you don't like it.
I'd expect that this tag was also about set of first/second category, and the way it looks now it seems as a tag intended only for questions about Baire category theorem.
Another question: Do you plan to add tag-wiki later? Or did you leave this to other users, who are struggling to earn research assistant badge?
Go ahead, submit any sorts of improvements, I'll accept (agreed with the first/second category point). I didn't intend to write the tag-wiki. I'm always taking an inordinate amount of time with that. Submit any sorts of improvements, I'm going to accept.
@t.b. I'll wait whether you do some more edits to it, but I'd expect having in tag-excerpt only what the tag is for (BCT, meager sets, ...) and the text you wrote could go (with some expansion) into tag wiki.
In the tag-wiki we also have possibility to use markdown.
@t.b. Since tag-excerpt is the thing the users see when they hover over the tag or when they are adding tags to a question, I think tag-excerpt should be short and it should clarify what the tag is intended for. (Especially in the cases when there might be confusion.)
I've made some changes, but you probably noticed - I've seen that you approved changes to the tag-wiki excerpt.