服务设计者必须根据操作签名中的请求和响应消息参数来决定服务契约的粒度。
A service designer must decide on the granularity of service contracts in terms of operation signatures for request and response message parameters.
操作系统对外公开一套通用功能的契约，比如搜索、分享等功能。
The operating system will expose a set of contracts for common functionality such as "search" and "share".
该方法必须遵循任意实现的服务契约或者实现的服务规格，以及定义操作的服务规格。
The method must conform to any fulfilled service contracts or realized service specifications, as well as to the service specification in which the operation is defined.
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