Question Answering with Joost at CLEF 2007

We describe our system for the monolingual Dutch and multilingual English to Dutch QA tasks. First, we present a brief overview of our QA-system, which makes heavy use of syntactic information. Next, we describe the modules that were developed especially for CLEF 2007, i.e. preprocessing of Wikipedia, inclusion of query expansion in IR, anaphora resolution in follow-up questions, and a question classification module for the multilingual task. We achieved 25.5% accuracy for the Dutch monolingual task, and 13.5% accuracy for the multilingual task.