[Zope-dev] Is TF IDF implemented in zope search engine. On NED in Zope.

Hi all, I was reading a paper on News Event Detection (NED) and I started wondering how hard would it be to implement such a mechanism in Zope. My first step was to find out if Zope already implemented a vector space model (tf idf, maybe) for indexing and searching the documents. I know nothing of Zope internals yet. So, I'm counting with your help for me to start digging into Zope's. Best regards and thanks in advance, Manuel.