#PCDATA in caption?

I don't know whether the content model for caption was changed in 4.3 
(which I use) or if my xmllint (using libxml version 20430) is buggy, 
but the following, which I did by mistake, is parsed as valid:

     <caption><simpara>Ein ungerichteter Graph mit der Knotenmenge
     V={0,1,2,3,4,5,6} und der Kantenmenge
     {{0,1},{0,3},{1,2},{2,3},{4,5},{4,6}}</simpara>
     0 und sind adjazent zueinander.</caption>

Greetings,
Joachim

-- 
Joachim Ziegler                       Stuhlsatzenhausweg 85
Max-Planck-Institut für Informatik    66123 Saarbrücken, Germany
Email:           Tel.: (+49) 0681 9325-127