The Ckip Chinese Treebank: Guidelines for Annotation

This paper aims to present the methodology and guidelines for annotation in CKIP Chinese Treebank. Under the framework of the Information-based Case grammar (ICG), a lexical feature-based grammar formalism, which stipulates each lexical item containing both syntactic and semantic information, the potential phrasal heads of input are located and the semantic relations between words are also identified. Thus, not only phrasal categories but also thematic roles are both annotated. Incorporating with Head-Driven Principle, some guidelines are also implemented for more consistent annotation in such grammatical phenomenon as the constructions of coordinates, topicalization, and the construction with nominal predicate. In addition, we tag the CKIP Treebank with semantic categories to extract useful collocation among semantic classes of the bracketed constitutes, which is also supposed to further enhance the performance of our parsing model.