Even beyond top-down and shift-reduce parser, NLTK also offers "chart parsers" that create partial hypotheses that a given sequence can be continued to fulfill a rule. 甚至,除了top-down和shift-reduce解析器以外,NLTK还提供了“chart解析器”,它可以创建部分假定,这样一个给定的序列就可以继而完成一个规则。