Consequently, architectural approaches where the development of a XML message processing layer requires the understanding of each of the underlying service components are inappropriate.
XML消息处理层的开发需要了解每个基础服务组件，因此这种结构方法是不合适的。
Potentially, those filters serve as a policy enforcement layer where the message is first checked from the security and Quality of Service (QoS) standpoints, and then is queued for processing.
这些筛选器可能作为策略强制层，消息首先在这里经过安全和服务质量(QoS)检查，然后排队等待处理。
The processing layer will use the key provided by the simulator service to identify the Spring XML file to retrieve.
处理层将会使用模拟器服务提供的键值来确定需要检索的Spring XML文件。
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