面向中文信息处理的现代汉语短语结构规则研究

Chapter three: With the existent syntactic and semantic categories, a constraint-based Chinese phrase-structure rule system is constructed. Each rule includes two parts: a context free rewrite rule and a series of unification equations. The former is used for describing the construction of a compounded phrase, and the latter is used for describing the functions of the compounded phrase and the constraints of the constituents，which generally consist of syntactic constraints and semantic constraints. As a result, there are 89 rules induced in this chapter for most types of phrases in Modern Chinese, i.e. np, ap, vp, dj.

Chapter four: This chapter analyzes the ambiguity of determining boundaries and structural relations of Chinese phrases in automatic parsing by computer. Seen from different perspectives, all of the ambiguous phrases can be classified into different types. In terms of components of ambiguous structures, ambiguous phrases can be classified into two categories: one including terminal symbols, the other not including terminal symbols but only non-terminal symbols. In terms of the influence of ambiguity, ambiguous phrases can also be classified into two categories: self-confined ambiguous phrases and non-self-confined ambiguous phrases. The influence of the former ambiguity is mainly inside the ambiguous phrases. The influence of the latter ambiguity is outside of the ambiguous phrases.

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