服务实现模型工件-表示服务实现层的工件，比如，服务运营或服务端点。
Service implementation Model artifact - artifacts representing service implementation layer, for example, service Operation or service Endpoint.
只要command实现的输入输出保持不变，业务逻辑中的更改不必去影响Web服务实现层。
As long as the inputs and outputs of the command implementations remain constant, changes in business logic do not need to impact the Web services implementation layer.
服务实现层(Service implementation layer)——负责将现有的(可通过后端适配器访问的)服务编排成客户所需的服务。
Service implementation layer - responsible for orchestration of existing services (accessible through back-end adaptors) into services required by customers.
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