Let me comprehend the output from RewriteLog in apache2. I've something similar to

...... (3) using pattern '^/img(.*)' to uri '/api/marker/2'
...... (3) using pattern '^/img/imagecache/(.+)' to uri '/api/marker/2' ..... (1) go through /api/marker/2
.... . (3) [perdir /some/path] add path info postfix: /some/path/marker -> /some/path/marker/2
.......(3) [perdir /some/path] strip per-dir prefix: /some/path/marker/2 -> marker/2

Individuals things in brackets (Example (1),(2) etc..., the important thing phrases "go throughInch "using pattern" "perdir" prefix/postfix etc. I do not see nothing in manual in regards to this.

I filed this as problem #49844 at Bugzilla: "No documentation around the logging format of RewriteLog"