位置独立性：这意味着目的地应该从网络中的任何位置可用。
Location independence: This means that a destination should be available from anywhere in the network.
请求者与提供者的这个分离带来了二者之间一定的独立性，从消息格式和网络协议的角度均是如此。
This decoupling of the requester and the provider creates a degree of independence between the two, from both a message format perspective and from a network protocol perspective.
网络类型独立性：代理体系结构必须能够容纳不同种类的连接性技术。
Network type independence: The surrogate architecture must be able to accommodate a diverse range of connectivity technologies.
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