It must first be understood that XSL, like all other programing languages, is merely a grammar specification in need of an implementation.
首先必须理解：象其它所有编程语言一样，XSL只是一种需要实现的文法规范。
Providing your own grammar pool implementation.
提供自己的语法池实现。
To implementation of efficient parsing of grammars, a new class of phrase structure grammars called overlap-free grammar(OFG) with heavily restricted rewriting rules is defined.
为了实现有效的文法解析，定义了一种生成规则受限的短语结构文法，称为无重叠生成文法。
To implementation of efficient parsing of grammars, a new class of phrase structure grammars called overlap-free grammar(OFG) with heavily restricted rewriting rules is defined.
为了实现有效的文法解析，定义了一种生成规则受限的短语结构文法，称为无重叠生成文法。
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