[Zope-CMF] Topic Criteria excluding subject

[Jan Ulrich Hasecke]

Hi,

is it possible to exclude Content in a topic-view by a keyword?

I have a Topic which displays links with general content. Search by
content-type "Link". 

Now I've made a Topic with links to a special Content, searched by
Subject:"special Keyword" and I do not want to show this links up in
the general linkcollection.

Is it possible to exclude them by Subject, someting like !Keyword 

TIA
juh