Completeness of Compositional Translation for Context-Free Grammars
  A machine translation system is said to be *complete* if all expressions that are correct according to the source-language grammar can be translated into the target language. This paper addresses the completeness issue for compositional machine translation in general, and for compositional machine translation of context-free grammars in particular. Conditions that guarantee translation completeness of context-free grammars are presented. 
Willem-Olaf Huijsen (Research Institute for Language and Speech (OTS),   Utrecht University, The Netherlands)