目标服务接口和操作名称。
这个结构中的重要字段包括接口规范名称服务缓存过期时间，这用于确认是否必须刷新缓存。
Some of the important fields of this structure are the interface specification name service cache expiration age to know if the cache has to be refreshed.
服务接口都被赋以唯一的名称，供标识之用。
Service interfaces were given names to uniquely identify them.
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