接口协议和实现策略之间的解耦。
Decoupling of interface protocols from an implementation strategy.
可通过协议或通过实现一系列规则强制执行信任策略来手动链接。
It can be articulated manually, by an agreement, or by implementing a set of rules enforcing the trust policy.
扩展开发者：通过支持更多协议，更多实现语言，更多数据格式，更多QoS策略等来丰富sca的功能。
Extension Developers: Enrich the SCA capabilities with support for more protocols, more implementation languages, more data formats, more qos.
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