These contracts include the provided and required interfaces, the roles those interfaces play in the service specification, and the rules or protocol for how those roles interact.
这些约定包括所提供的和所需要的接口，在服务规范中那些接口所扮演的角色，以及那些角色如何交互的规则或协议。
Further, the consumer and provider must interact according to the protocol defined in the service interface.
进一步，消费者和提供者必须依照服务接口中定义的协议进行相互作用。
To model this protocol, we need to specify the producer and consumer roles, their responsibilities, and the protocol or rules for how they interact.
要对这一协议进行建模，我们需要指定生产者和消费者这两个角色，它们的职责、以及它们进行交互的协议或者规则。
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