Annotating a Japanese Text Corpus with Predicate-Argument and Coreference Relations

In this paper, we discuss how to annotate coreference and predicate-argument relations in Japanese written text. There have been research activities for building Japanese text corpora annotated with coreference and predicate-argument relations as are done in the Kyoto Text Corpus version 4.0 (Kawahara et al., 2002) and the GDATagged Corpus (Hasida, 2005). However, there is still much room for re ning their speci cations. For this reason, we discuss issues in annotating these two relations, and propose a new speci cation for each relation. In accordance with the speci cation, we built a large-scaled annotated corpus, and examined the reliability of our corpus. As the result of our current work, we have released an annotated corpus named NAIST Text Corpus, which is used as the evaluation data set in the coreference and zero-anaphora resolution tasks in Iida et al. (2005) and Iida et al. (2006).