In this sample Message Broker flow shown in Figure 13, the SRRetrieveEntity node is used to retrieve all metadata contents for a specific entity.
在图13中所示的此示例Message broker流中，SRRetrieveEntity节点用于从特定实体检索所有元数据内容。
A node here is a logical entity; for our simple example, all three of these nodes could be on the same physical computer.
这里的节点为逻辑实体；我们的示例应用程序非常简单，这三个节点可位于同一台计算机上。
A service provider node can represent the services of a business entity or it can simply represent the service interface for a reusable subsystem.
服务提供者节点能代表商业实体的服务，或者它甚至能代表可重用的子系统的服务接口。
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