Tags for conlanging

Ok, I've scanned in most of my non-fiction and tagged lots. I figured it was time to discuss how to tag, I'll use my own library as an example:

I use "conlang" when I feel the book is useful for conlangers/conlanging. I might start tagging books containing conlangs the same way, still undecided. There are a lot more books useful for conlangers in my library than what I have tagged, though.

Other relevant tags are "linguistics", "language", and "dictionary". In addition to the "linguistics"-tag I may have added tags for the subtype of linguistics, like "syntax" or "phonetics" or what have you. I'm not sure whether I should add "conlang" to all books that have the before-mentioned tags or not.

Now, over to you!

I use "conlangs" for books that contain conlangs, at the moment. "Ling&langs" is my catch-all tag for linguistics- and foreign language-related books, which system probably needs tweaking.