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ERIC Number: ED027517
Record Type: Non-Journal
Publication Date: 1968-Jul
Pages: 36
Abstractor: N/A
Reference Count: N/A
Dependency Structures and Transformational Rules.
Robinson, Jane J.
In this paper the author shows that dependency grammars are not only equivalent to structure-free phrase-structure grammars (i.e., equally adequate), but are even more informative: they express both the "is a" relation which phrase-structure grammars express and the "governs" relation which phrase-structure grammars obscure. It is shown that dependency theory with its concept of "governor" succeeds where phrase-structure theory fails and in addition resolves some of the knotty problems left unresolved by other formulations of the concept of "head" in part endocentric terms. The problem of designating a "governor-head" for exocentric constructions of the base component is discussed in terms of selecting among distinctive categories of a structure-free analysis either in phrase structure or dependency terms. As in all transformational grammars, considerations of the results of applying transformations to obtain appropriate structures for derived sentences plays a key role in making the decision. Since a dependency grammar has a unique restatement as a dependency-phrase grammar, the transformation rules defined on its structures can be stated in the phrase-structure form now used (labelled bracketings with variables) or solely in dependency form. The latter eliminates the need for "tree-pruning." (DO)
Clearinghouse for Federal Scientific & Technical Information, Springfield, Va. 22151 (AD-679 633, MF $.65, HC $3.00) Prepayment requested.
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: Air Force Cambridge Research Labs., L.G. Hanscom Field, MA.
Authoring Institution: International Business Machines Corp., Yorktown Heights, NY. Thomas J. Watson Research Center.