某标识表示上下文无关的标识符(比如限定标识)。
X-id is an identifier with no context-dependent meaning (e. g. qualified-id).
如果我有一个上下文无关的语法,它并不能自动产生程序,我还是得写程序。
If I have a context free grammar, it doesn't generate the programs. I still have to write them.
如果您使用一种上下文无关的文法,那么n元语法的结构(参见参考资料)可能是您所需要的。
If you work with a context-free grammar, the structure of n-gram (see Resources) might be what you require.
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