In bash, all Boolean expressions are enclosed in square brackets.
在bash中，所有布尔表达式都用方括号括起。
Another nice feature of XPath is its ability to evaluate Boolean expressions.
XPath的另一个特点是能够计算布尔表达式。
We can define multiple conditions in a single Query Filter definition by using Boolean expressions.
可以使用布尔表达式在单个Query Filter定义中定义多个条件。
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