The extraction procedure consists of three steps : First , the bracketing of the trees in the Penn Treebank is corrected and extended based on the approaches of Magerman ( 1994 ) and Collins ( 1997 ) .
natural language parsing as statistical pattern recognition
David Magerman
Xia ( 1999 ) also presents a similar method for the extraction of a TAG from the Penn Treebank . The extraction procedure consists of three steps : First , the bracketing of the trees in the Penn Treebank is corrected and extended based on the approaches of Magerman ( 1994 ) and Collins ( 1997 ) . Then the elementary trees are read off in a quite straightforward manner .
The extraction procedure consists of three steps : First , the bracketing of the trees in the Penn Treebank is corrected and extended based on the approaches of @@CITATION and Collins ( 1997 ) .