这些小三角对应于控制代码合并的加减符号。
These correspond to the plus and minus signs that control code folding.
通过在合法的列表中都不包含空格和标点符号，就可以防止出现被控制的问题。
By not including whitespace characters and punctuation in the legal list, you can prevent potential avenues of manipulation.
转换图还包含 输入符号（在本例中为 XML 标记）和控制输入符号如何修改状态的 转换函数。
The transition diagram also includes input symbols (in this case XML tags) and a transition function that controls how input symbols modify the state.
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