逻辑表达式，是否可以将它取反？
Similarly, take any Boolean expression. Could you just reverse it?
使用正则表达式，逻辑就变得简单了。
The logic becomes trivial when you put regular expressions into action.
如果一个表达式的逻辑不容易理解，则需要试着改变其形式。
If a logical expression is hard to understand, try transforming it.
这个表达式可以使用逻辑比较操作。
表达式问题的最常用解决方案之一是普通老式的if - then - else逻辑。
One of the most common solutions to the Expression Problem is plain old if-then-else logic.
XPath表达式中的二进制逻辑比简单的true和false要稍微复杂一点。
Binary logic in XPath expressions is a bit more complex than simply true and false.
逻辑测试还可以针对类似 Perl 的正则表达式进行测试。
The logical test can also test against a Perl-like regular expression.
Modeler中的表达式编辑器用于定义决策逻辑。
The expression editor in Modeler is used to define the logic for decisions.
设想一个逻辑操作表达式，例如port . signal. send 。
Imagine a logical action expression, such as port.signal .send .
设想一个逻辑操作表达式，例如port . signal. send 。
Imagine a logical action expression, such as port.signal .send .
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