ACL Anthology Network (All About NLP) (beta) The Association Of Computational Linguistics Anthology Network 
ACL ID  P891029 

Title  A Generalization Of The Offline Parsable Grammars 
Venue  Annual Meeting of the Association of Computational Linguistics 
Session  Main Conference 
Year  1989 
Authors 

The offline parsable grammars apparently have enough formal power to describe human language, yet the parsing problem for these grammars is solvable. Unfortunately they exclude grammars that use xbar theory  and these grammars have strong linguistic justification. We define a more general class of unification grammars, which admits xbar grammars while preserving the desirable properties of offline parsable grammars. Consider a unification grammar based on term unification. A typical rule has the form t o ~ t 1... t n where t o is a term of first order logic, and tt...t n are either terms or terminal symbols. Those t i which are terms are called the toplevel terms of the rule. Suppose that no toplevel term is a variable. Then erasing the arguments of the top level terms gives a new ...