Accession Number : ADA137110

Title :   Extending Grammars to New Domains.

Descriptive Note : Research rept.,


Personal Author(s) : Robinson,J J

PDF Url : ADA137110

Report Date : Jan 1984

Pagination or Media Count : 63

Abstract : This is the report of an undertaking to extend and adapt an existing grammar, DIAGRAM, to provide the syntactic analysis of sentences in a new domain. DIAGRAM is an augmented phrase-structure grammar whose rules provide a means for associating semantic and domain dependent interpretations with a syntatic analysis. An earlier version, used for the syntactic analysis and the interpretation of spoken English, covered the vocabulary and basic phrase types needed to query a static data base of information about naval ships. The new domain in which the extended and adapted version has been tested is represented by a set of eighteen dialogues, called Helper dialogues, in which computer users present their problems to the operator and ask for help. Extending the syntax to cover the new words and phrase types exhibited in these sample texts raises a number of questions of general theoretical interest along with problems that can properly be construed as artifacts of the particular grammar that is being extended or of the limitations of the parsing program and the computer system in which the grammar is applied to input sentences. This report therefore can be read with both a broad and a narrow scope. The narrow scope reading is concerned with the additions and revisions that were made to DIAGRAM in order to parse the sentences in the dialogues selected from the new domain. The broad scope reading is concerned with the kinds of problems encountered in extending syntatic coverage generally and with strategies for coping with them. (Author)

Descriptors :   *Artificial intelligence, *Computational linguistics, *Phrase structure grammars, Man machine systems, Man computer interface, Comprehension, Semantics, Syntax, Parsers, Natural language, English language, Linguistics, Information processing, Models, Computer programs

Subject Categories : Linguistics
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE