A parameter marker is a way to accommodate this.

参数标志是满足这种需要的一种方式。

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Written in marker pen or spray paint, these designs were purely functional but they gradually made way for more artistic work.

这些用记号笔或喷漆画的图案原本只具功能性，但是它们逐渐成为更具艺术性的作品。

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If your design includes empty interfaces that types are expected to implement, you are most likely using an interface as a marker, or a way of identifying a group of types.

如果你的设计包含一个空的接口，并且希望一些类型实现这个接口，你很可能希望使用这个接口作为一个标记来标示一组类型。

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