Defining a subset of constraints to group them by use cases (the user is valid and has provided enough information to buy in one click).

定义约束的一个子集，以根据用例对其分组(用户是有效的，而且用户在一次点击中提供了足够的信息)。

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Public information is any information provided by the user with a clear mind that it could be displayed to everyone in the system.

公共信息由用户提供，且用户表明愿意将其显示给系统中的所有人。

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This client is provided with the necessary user authentication information, and opens an authenticated connection to the Calendar service.

该客户机提供了必要的用户身份验证信息，开启了Calendar服务的身份验证连接。

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The only intentional sharing of identity information, she said, was an encoded version of the user's email address, provided to a company that sends marketing emails to readers who opt to receive them.

WSJ: They Know What You're Shopping For