一个性能需求指定了性能可接受的限值，并帮助您确认服务层次的协议。
A performance requirement specifies acceptable thresholds of performance and helps validate service level agreements.
第一代CA由SETCO公司建立，以SET协议为基础，服务于B2C电子商务模式的层次性结构。
The first generation of CA was set up by SETCO based on SET protocols, serving the B2C e-commerce hierarchy.
传统的语法层次上的服务发现协议在查全率和查准率上都无法满足人们对智能化、个性化服务的需求。
The traditional service discovery protocol on the syntax level cannot satisfy people's intelligent and individual demands in recall and precision aspects.
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