Thanks for your reply. I didn't know LaTex as filetype so far, but I'm quite facinated by the idea. Combined with a Ghostscript/Ghostview, this is a very good solution to make pdf documents via xml feeds over different platforms. This is about the way the examples (next to download link) have been created.
Your reply was all I needed. I've been googling, but didn't find anything that brought me further on. thanks again for your help and greets.
a bit late, but perhaps interesting to other users: if you don't have MiKTeX or another laTeX-distrubution installed, you can compile the covers online here: online latex compiler
Copy the exported tex-file and paste it in the editor-window
Switch to "output format" PDF
Press [compile]
download the pdf-file
Because the original cosmo export file does not work right for me (wrong size, does not fit in the jewel-box), I've changed some numbers for the size (*.mte see below). Hope it would be helpfull for anyone ...