:before, :after and content

Hello,

I try to edit generic XML with Amaya 9.1.  I wrote a CSS stylesheet and 
referenced it in the XML document via a xml-stylesheet processing 
instruction.

Now I discovered that Amaya ignores content generation instructions which are 
specified via the :before and :after pseudo-elements and the content property 
(see http://www.w3.org/TR/CSS21/generate.html).  Is this in fact a 
restriction in the current Amaya version or have I overlooked something?

Best wishes,
Wolfgang