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本文叙述了在通常的文法中引入两个基元间连接属性的重要性,从而看出在属性文法中,句法和词意两部分间可以有折衷的关系,即增加后者的复杂性将会使前者得到简化,反之亦然。这样使便于应用的有限状态属性文法成为基本的形式。这里作者吸取了PDL,Plex Grammar,Tree Grammar中连接关系的优点,引入连接属性,提出一类关联属性文法。这类文法可以有效地描述和识别曲线段构成的图形,如汉字、电子线路图等。
This article describes the importance of introducing the properties of the two primitives in common grammar and thus finds that in the attribute grammar, there is an eclectic relationship between the syntactic and the meanings of the word meaning that increasing the latter’s complexity will The former is simplified, and vice versa. This makes it easy to apply finite state attribute grammars to the basic form. Here, the author draws the advantages of the connection relation in PDL, Plex Grammar and Tree Grammar, introduces the connection properties, and proposes a kind of related property grammar. Such grammar can effectively describe and identify the curve segment composed of graphics, such as Chinese characters, electronic circuit diagrams.