What means the part between the date and the server answer in Apache’s log?

I have in the log file a following line:

xxx.xxx.xxx.xxx;[05/Aug/2016:00:00:48 +0200];GET /extensions/css/example.css?rev=example HTTP/1.1;200;66931;http://www.example.com/page.html

Please explain me, what means the part between the date and the server answer? I'm a bit perplexed about it - it isn't a redirect URL, but what is it then?

Edit:I come to decision, that i've completely misformulated my question - sorry for that.

I don't mean with my question, what are the senses of certain url parts, like rev=example etc. I'm rather interesting, why are in the log entry two kinds of url: one of them, the first, beginning with GET, and the second at the entry's end.

I thought firstly its a kind of redirect - but no, the answer code is 200. So what mean two urls / paths in this log entry?