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a modification of the Gazdar and Mellish
bottom-up chart parser , the module builds a semantic
representation compositionally, and a `best parse' algorithm is
applied to each final chart, providing a partial parse if no complete
sentence span can be constructed.
The parser operates in two stages, first applying a Named Entity
grammar to construct proper noun phrases, then applying a full
sentence grammar, derived partly from an automatic analysis of the tag
sequences occurring in the Penn TreeBank corpus .