Empirical study of the relevance of semantic information for anaphora resolution: the case of adverbial anaphora

In this paper we present the referential tagging of part of the EPEC Corpus of Basque (26,000 words). We extended our annotation from pronominal anaphora to include other types of referential structures, such as proper names, and nominal and adverbial anaphora. We describe the criteria defined for the annotation and the problematic cases we found in the tagging process. We particularly focus here on adverbial anaphora, with the aim of drawing some conclusions related to the features of antecedents in order to test whether semantic information can be helpful in future computational treatment of this phenomenon.