In an XPath expression, comparing a string and a Boolean function can yield unexpected results.

在XPath表达式中，比较字符串和Boolean函数会得到非预期的结果。

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Consider the unexpected result when a Boolean function is converted to a string and back again.

考虑Boolean函数转换成字符串以及再转换回来时会出现的非预期结果。

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The string function, however, is not the only means of converting a Boolean function to a string.

但是string函数并不是将Boolean函数转换成字符串的惟一方法。

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PROFESSOR2: So it's not really a Boolean-valued function.

教授2：因此这并不是一个,真正的布尔值的函数。

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