Evaluating and improving syntactic lexica by plugging them within a parser

We present some evaluation results for four French syntactic lexica, obtained through their conversion to the Alexina format used by the Lefff lexicon (Sagot, 2010), and their integration within the large-coverage TAG-based FRMG parser (de La Clergerie, 2005). The evaluations are run on two test corpora, annotated with two distinct annotation formats, namely EASy/Passage chunks and relations and CoNLL dependencies. The information provided by the evaluation results provide valuable feedback about the four lexica. Moreover, when coupled with error mining techniques, they allow us to identify how these lexica might be improved