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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Discontinuous-constituent phrase structure grammar ： ウィキペディア英語版 Discontinuous-constituent phrase structure grammar Discontinuous-constituent Phrase Structure Grammar (DCPSG) (distinct from Discontinuous Phrase Structure Grammar/DPSG) is a formalism for describing discontinuous phrase structures in natural language, such as verb phrases in VSO languages. The formalism was introduced in the slightly more constrained form of Discontinuous-constituent Phrase Structure Grammar with Subscripts and Deletes (DCPSGsd) in Harman (1963).〔Harman, Gilbert H. 1963. Generative Grammars without Transformation Rules: A Defense of Phrase Structure. ''Language'' 39(4), 597-616.〕 DCPSGs describe a superset of the context-free languages, by means of rewrite rules that permit a limited amount of wrapping, similar to that found in Head grammar. ==Description== Re''write rules of a DCPSG are identical to those of a CFG, with the addition of a meta-symbol, denoted here as an underscore. ''DCPSG'' rules therefore have the general form $X\; \backslash to\; \backslash alpha$ where $\backslash alpha$ is a string of terminal symbols and/or non-terminal symbols and at most one underscore. The rewrite semantics of DCPSG are identical as those of a CFG when the rule being used does not contain an underscore: given a rule $X\; \backslash to\; \backslash alpha$, an occurrence of $X$ may be rewritten as $\backslash alpha$. For rules with an underscore, the rewrite semantics are slightly different: given a rule $X\; \backslash to\; \backslash alpha\; \backslash \_\; \backslash beta$, an occurrence of $X$ can be rewritten as $\backslash alpha$, with $\backslash beta$ being inserted immediately after the next non-terminal that is introduced at the same time. Using strict left-most productions, $\backslash beta$ is simply inserted immediately after the non-terminal that follows $X$ prior to the rewrite. '' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Discontinuous-constituent phrase structure grammar」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.