To guarantee the uniqueness of global identifiers they must be URIs ( meaning they most likely contain a domain name that has been registered to guarantee uniqueness ) .

为了保证全局标识符的 唯一 性，全局标识符必须是URI（就是说很可能包含注册的 域名以保证唯一性）。

In this particular case let 's assume that the uniqueness of a Person in the system is its first name-last name combination .

在这个特定例子中，假设系统中Person的 惟一 性是其 姓名的组合。