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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 head grammar ： ウィキペディア英語版 head grammar Head Grammar (HG) is a grammar formalism introduced in Carl Pollard (1984)〔Pollard, C. 1984. ''Generalized Phrase Structure Grammars, Head Grammars, and Natural Language''. Ph.D. thesis, Stanford University, CA.〕 as an extension of the Context-free grammar class of grammars. Head Grammar is therefore a type of phrase structure grammar, as opposed to a dependency grammar. The class of head grammars is a subset of the linear context-free rewriting systems. One typical way of defining head grammars is to replace the terminal strings of CFGs with indexed terminal strings, where the index denotes the "head" word of the string. Thus, for example, a CF rule such as $A\; \backslash to\; abc$ might instead be $A\; \backslash to\; (abc,\; 0)$, where the 0th terminal, the ''a'', is the head of the resulting terminal string. For convenience of notation, such a rule could be written as just the terminal string, with the head terminal denoted by some sort of mark, as in $A\; \backslash to\; \backslash widehatbc$. Two fundamental operations are then added to all rewrite rules: wrapping and concatenation. ==Operations on Headed Strings== 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「head 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.