The importance of including nonheadwords has become uncontroversial ( e.g. Collins 1999 ; Charniak 2000 ; Goodman 1998 ) .
a maximumentropyinspired parser
E Charniak
While the models of Collins ( 1996 ) and Eisner ( 1996 ) restricted the fragments to the locality of head-words , later models showed the importance of including context from higher nodes in the tree ( Charniak 1997 ; Johnson 1998a ) . The importance of including nonheadwords has become uncontroversial ( e.g. Collins 1999 ; Charniak 2000 ; Goodman 1998 ) . And Collins ( 2000 ) argues for `` keeping track of counts of arbitrary fragments within parse trees '' , which has indeed been carried out in Collins and Duffy ( 2002 ) who use exactly the same set of ( all ) tree fragments as proposed in Bod ( 1992 ) .
The importance of including nonheadwords has become uncontroversial ( e.g. Collins 1999 ; @@CITATION ; Goodman 1998 ) .