Generalized phrase structure grammar (GPSG) is a framework for describing the syntax and semantics of natural languages. It is a type of phrase structure grammar, as opposed to a dependency grammar. GPSG was initially developed in the late 1970s by Gerald Gazdar. Other contributors include Ewan Klein, Ivan Sag, and Geoffrey Pullum. Their book Generalized Phrase Structure Grammar, published in 1985, is the main monograph on GPSG, especially as it applies to English syntax.
One of the chief goals of GPSG is to show that the syntax of natural languages can be described by context-free grammars (written as ID/LP grammars), with some suitable conventions intended to make writing such grammars easier for syntacticians. Among these conventions are a sophisticated feature structure system and so-called "meta-rules", which are rules generating the productions of a context-free grammar. GPSG further augments syntactic descriptions with semantic annotations that can be used to compute the compositional meaning of a sentence from its syntactic derivation tree. However, it has been argued (for example by Robert Berwick) that these extensions require parsing algorithms of a higher order of computational complexity than those used for basic CFGs.
Gerald Gazdar, and many other syntacticians, have since argued that natural languages cannot in fact be adequately described by CFGs .
GPSG is in part a reaction against transformational theories of syntax. In fact, the notational extensions to context-free grammars developed in GPSG are claimed to make transformations redundant. Most of the syntactic innovations of GPSG were subsequently incorporated into head-driven phrase structure grammar.
Famous quotes containing the words generalized, phrase, structure and/or grammar:
“One is conscious of no brave and noble earnestness in it, of no generalized passion for intellectual and spiritual adventure, of no organized determination to think things out. What is there is a highly self-conscious and insipid correctness, a bloodless respectability submergence of matter in manner—in brief, what is there is the feeble, uninspiring quality of German painting and English music.”
—H.L. (Henry Lewis)
“And what, then, is belief? It is the demi-cadence which closes a musical phrase in the symphony of our intellectual life.”
—Charles Sanders Peirce (1839–1914)
“Just as a new scientific discovery manifests something that was already latent in the order of nature, and at the same time is logically related to the total structure of the existing science, so the new poem manifests something that was already latent in the order of words.”
—Northrop Frye (b. 1912)
“Grammar is the logic of speech, even as logic is the grammar of reason.”
—Richard Chenevix Trench (1807–1886)