虽然这是不正确的xpath语法，但是括号暗示了不同的优先级。
Although this is not proper XPath syntax, the parentheses imply a different priority.
该语法还知道运算符优先级。
设置 throttling优先级的语法很简单。
当访问和修改属性是应该总是使用点语法，这会使得代码更简洁。括号符号具有更高的优先级。
Dot-notation should always be used for accessing and mutating properties, as it makes code more concise. Bracket notation is preferred in all other instances.
有一些运算符的优先级不合适；语法的一些部分还可以做得更好。
Some of the operators have the wrong precedence; some parts of the syntax could be better.
请注意下面的列表只是SGML语法规则全集的简化版本，并不涉及比如优先级等其他复杂规则。
Please note that the list below is a simplification of the full SGML syntax rules and does not address, e. g., precedences.
请注意下面的列表只是SGML语法规则全集的简化版本，并不涉及比如优先级等其他复杂规则。
Please note that the list below is a simplification of the full SGML syntax rules and does not address, e. g., precedences.
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