buChart Parser:

a modification of the Gazdar and Mellish bottom-up chart parser [17], 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 [22].