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。
In some cases, you might want to provide your own grammar pool implementation.
有时候可能希望提供自己的语法池实现。
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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