指定属性的位置参数和具名参数。
Specify positional parameters and named parameters for the attribute.
借助于具名参数，我们可以有选择地修改被拷贝实例的值，请参看scala站点以深入了解该主题。
Using named arguments, one can selectively change values for the copied instance, as shown on the Scala website.
当应用程序第一次执行建立参数执行个体的程序码时，会检查组态档是否有关于具名参数的追踪层级资讯。
When your application executes the code that creates an instance of a switch for the first time, it checks the configuration file for trace-level information about the named switch.
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