  This paper presents an overview of `Lexpresso', a Controlled Natural Language
developed at the Defence Science & Technology Organisation as a bidirectional
natural language interface to a high-level information fusion system. The paper
describes Lexpresso's main features including lexical coverage, expressiveness
and range of linguistic syntactic and semantic structures. It also touches on
its tight integration with a formal semantic formalism and tentatively
classifies it against the PENS system.
