To use an XPath expression within parameters that expect a static string, dynamic XPath expression invocation can be done by wrapping the expression within braces ({and}).

要在期望静态字符串的参数中使用XPath表达式，可以通过将表达式封装在括号({和})中来调用动态xpath表达式。

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When this macro executes, it will match the my-if expression up to the template like this (in other words, matching a macro invocation to a macro definition pattern).

在这个宏执行时，它按照以下形式将my - if表达式与模板进行匹配(换句话说，将宏调用与宏定义模式进行匹配)。

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The story is slightly different when the diamond expression appears in a method-invocation context. Consider a Box that appears as an argument to the m() method

在 diamond 表达式出现在方法调用上下文时会有轻微的不同。

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