Discourse Structure and Co-Reference: An Empirical Study
Dan Cristea, Nancy lde, Daniel Marcu, Valentin Tablan · 1999
We compare the potential of two classes of linear and hierarchical models of discourse to determine co-reference links and resolve anaphors. The comparison uses a corpus of thirty texts, which were manually annotated for co-reference and discourse structure. 1 Introduction Most current anaphora resolution systems implement a pipeline architecture with three modules (Lappin and Leass, 1994; Mitkov, 1997; Kameyama, 1997). 1. A COLLECT module determines a list of potential antecedents (LPA) for each anaphor (pronoun, definite noun, proper name, etc.) that have the potential to resolve it. 2. A FILTER module eliminates referees incompatible with the anaphor from the LPA. 3. A PREFERENCE module determines the most likely antecedent on the basis of an ordering policy. In most cases, the COLLECT module determines an LPA by enumerating all antecedents in a window of text that precedes the anaphor under scrutiny (Hobbs, 1978; Lappin and Leass, 1994; Mitkov, 1997; Kameyama, 1997; Ge et al....