上下文無關(guān)
If (X,a) is a pair of symbols of any context free grammar, then there is at most one generalized precedence relation between X aad a. 在分析速度和占用內(nèi)存方面,廣義優(yōu)先文法與弱優(yōu)先文法相似,但前者包含的文法類更廣。
If( X, a) is a pair of symbols of any context free grammar, then there is at most one generalized precedence relation between X aad a. 指出基因表達(dá)式編程和僅含有單個非終結(jié)符的上下文無關(guān)文法在描述能力上是等價的。
LFC is different from otherfunctional languages in that LFC uses context free language (CFL) as its basic datatype and the theory of CFRF (Recursive Function defined on Context-Freelanguages) as its theoretical basis. 作為一種函數(shù)式語言，LFC 語言具有函數(shù)式語言共有的特點，而 LFC 語言與其它函數(shù)式語言不同的地方在于其將上下文無關(guān)語言(CFL)作為基本的數(shù)據(jù)類型，其理論基礎(chǔ)是上下文無關(guān)語言遞歸函數(shù)(CFRF)理論。
This essay summarizes the effects, problems and solutions of Chinese parsing using CTT with a Chinese simple Context Free Grammar (CFG) after a brief introduction of the composition, several characteristics of the Copenhagen Tree Tracer (CTT) program. 本文簡要介紹了自然語言處理的圖形接口軟件CTT(Copenhagen Tree Tracer),并介紹了利用它在簡單的CFG形式化體系下做漢語自動句法分析的狀況、存在問題、解決辦法。
On the basis of the formalizable characteristic of music rhythm, a probabilistic context free grammar (PCFG) system was defined to describe the relatively independent music rhythm elements. 基于音樂節(jié)奏本身具有可被形式化的特性，定義了一個概率上下文無關(guān)文法(PCFG)系統(tǒng)來描述相對獨立的音樂節(jié)奏元素。
Metaobject parsing is a formalized method, which is used for system comprehension of the procedure-oriented legacy software.The method is based on object-oriented context free grammar. 元對象分析法是理解面向過程遺產(chǎn)軟件系統(tǒng)的一種形式化方法，這種方法以面向?qū)ο蟮纳舷挛臒o關(guān)文法為基礎(chǔ)。
