Hybrid Constraints for Robust Parsing: First Experiments and Evaluation

In this paper we present IDEAL+, a parsing architecture for Italian, which pursues the goal of pairing robustness with deep linguistic analysis by extending a shallow processing kernel with a pool of hybrid constraints for the incremental identification of grammatical relations. The parsing output takes the form of dependency structures representing the full range of instantiated functional relations (e.g. subject, object, modifier, complement, etc.). The paper focuses on nature and interaction of the battery of hybrid constraints and evaluates their joint impact against a gold standard of more than 700 manually annotated sentences.