The lexicon is used to mediate and map between a language-independent domain model and a language-dependent ontology widely used in NLG , the Upper Model ( Bateman 1990 ) .
upper modeling organizing knowledge for natural language processing
John A Bateman
The resulting approach has at its center a lexicon that partly implements current theories of lexical semantics such as Jackendoff 's ( 1990 ) and Levin 's ( 1993 ) . The lexicon is used to mediate and map between a language-independent domain model and a language-dependent ontology widely used in NLG , the Upper Model ( Bateman 1990 ) . Although the idea of a two-level representation accommodating language-neutral and language-specific requirements is not new ( see for example Nirenburg and Levin [ 1992 ] , Dorr and Voss [ 1993 ] , and Di Eugenio [ 1998 ] ) , Stede is among the few who make effective use of those two levels in a complex system .
The lexicon is used to mediate and map between a language-independent domain model and a language-dependent ontology widely used in NLG , the Upper Model ( @@CITATION ) .