Abstract
Japanese corpora annotated with predicate-argument structure (PAS) have been constructed as part of several research projects and these annotated corpora have significantly advanced the field of PAS analysis. However, according to an inter-annotator agreement study and qualitative analysis of the existing corpora, there is still a strong need for further improvement of the annotation guidelines of the corpora. To improve the quality of PAS annotation guidelines, we have collected and summarized the practical knowledge and a list of problematic issues concerning the task of the PAS annotation through discussions with researchers actively engaged in the construction of NAIST Text Corpus (NTC) and Kyoto Text Corpus (KTC), researchers concerned with existing PAS annotation guidelines, and an annotator who is working on the annotation task, using NTC and KTC guidelines. This paper reports the problems and suggestions that we collected and possible solutions to those problems on the basis of results of the discussions. Finally, we suggest a method for continuously improving annotation guidelines.
