As we have seen, grammar can also come from a file or from an internal text string.

正如我们所见，文法可以来自一个文件或来自一个内部的文本字符串。

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After generating the QDML file from a DTD grammar I had to edit the file to define the document root element and add type information for non-String values (a couple of ints, in this case).

根据DTD文法生成QDML文件之后，必须编辑该文件来定义文档的根元素，并为非string值(在这里，是几个int)添加类型信息。

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The Sequitur compression algorithm is a linear-time online algorithm that forms a context-free grammar for a given string input.

Sequitur压缩算法是线性时间在线算法，为给定的字符串输入生成了一种与上下文无关的语法。

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