BNF description of syntax
在BNF表示法中，為了表示一串任意個數的元素，唯一的方法是通過遞歸來定義。
一百在BNF範式編碼的基礎上，深入討論了生僻漢字數字化處理問題。
Automated tools can use those descriptions (I'll use the generic term, BNF, to refer to both variations) or a close approximation thereto to generate your parsing code for you.
In BNF, the only way to indicate a list of an arbitrary number of elements is through recursion.
The BNF is used to formalize the network access control rules.
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