Obviously there are two schools of thought regarding wiki excepts:
It should tell what that tag is about; e.g. drivers
Device driver or software driver program allowing higher-level computer programs to interact with a hardware device.
It should tell what kind of questions should get this tag; e.g. server
This is for questions related to Ubuntu Server (As opposed to Ubuntu Desktop), and the Ubuntu Server core, as well as any questions related to installing services and programs on Ubuntu Server
I want your input which form is preferable.
The other related question I found (http://meta.askubuntu.com/questions/3977/what-makes-a-tag-wiki-good) doesn't focus on the excerpt (although the example given is of the second form).