Thank you very much, Vincent and Sergiu!
Sergiu, the workaround you suggested is perfect. But you were right, it
was quite a bunch of work :-)
One more question came up: Shall I share this piece of information as a
FAQ on xwiki.org? I'm not sure, because the XWiki 2.0 Syntax offers a
more efficient workaround for versions 1.7 and up. Hence, the workaround
for older versions might be outdated. What do you think?
Best regards,
Sascha