WLM allows you to assign workloads with different response time requirements to different service classes and service subclasses.
WLM允许您将具有不同响应时间需求的工作负载分配给不同的服务类和服务子类。
Thus, the Web service implementation can use the subclasses, but since they do not appear in the interface definition, cannot send them in messages.
因此，Web服务实现可以使用子类，但由于他们没有出现在接口定义中，所有不能在消息中发送他们。
Since the client has the complete data model hierarchy, it is possible for the client to send subclasses in the hierarchy in a request to the Web service.
由于客户端拥有完全的数据模型层次，客户端就有可能在Web服务请求中发送层次中的子类。
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