Why do captions appear centered?

They do, both in HTML and FO output.

This only looks good when a caption is so small that it fits into one 
line, but

"A Caption is an extended description of a MediaObject."

"Extended" means IMHO a block of text that can become quite large. And 
that's what my captions are. Else they were just titles.

Am I wrong?

Joachim

-- 
Joachim Ziegler                       Stuhlsatzenhausweg 85
Max-Planck-Institut für Informatik    66123 Saarbrücken
Email:           Germany