第四，我们强化了商会这类中介机构的服务与协调功能。
Fourth, we have strengthened the service and coordinating functions of such intermediary organizations.
Broker协调使用者与服务提供者，如图3所示。
The broker coordinates the consumer with the service providers, as shown in Figure 3.
在第4部分。服务的组成中，我们查看了怎样通过服务渠道将可协调的请求与服务联系起来，来集合服务参与者。
In part 4. Service Composition we looked at how services participants can be assembled by connecting compatible requests and services through service channels.
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