2795	 Sentence Paraphrasing from a Conceptual Base	 A model of natural language based on an underlying language-free representation of meaning is described. A program based on this model is able to produce sentence paraphrases which demonstrate understanding with respect to a given context. This generator operates in conjunction with a natural language analyzer and a combined memory and inference model. In generating sentences from meaning structures the program employs both the information retrieval and deduction capabilities of the memory model. The model encompasses several diverse classes of linguistic knowledge which include executable tests of conceptual properties stored in discrimination nets information relating conceptual to syntactic roles stored in a word-sense dictionary and surface grammatical knowledge stored in a formal grammar. artificial intelligence natural language processing language generation models of cognitive processes semantic representation
