端口类型就是命名了的一组抽象操作和涉及到的消息集合。
A port type is a named set of the abstract operations and messages involved.
您可以通过实现接口和类执行来执行这些抽象操作。
You can implement abstraction by having realizations between the interfaces and the class implementations.
不管如何去实现，抽象操作以简化数据管理的总体想法是正确的。
The general idea of abstracting operations to simplify data management is valid, no matter how you implement it.
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