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Annotation of Explicit and Implicit Discourse Relations in the TüBa-D/Z Treebank

We report on an effort to add annotation for discourse relations, discourse structure, and topic segmentation to a subset of the texts of the Tübingen Treebank of Written German (TüBa-D/Z), which will allow the study of discourse relations and discourse structure in the context of the other information currently present in the corpus (including syntax, referential annotation, and named entities). This paper motivates the design decisions taken in the context of existing annotation schemes for RST, SDRT or the Penn Discourse Treebank, provides an overview over the annotation scheme and presents the result of an agreement study. In the agreement study, we use the notion of interadjudicator agreement to show that the task of discourse annotation, while challenging in principle, can be successfully solved when using appropriate heuristics.