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This API defines a language- and platform- neutral protocol for Consumers to request address book, profile, and friends-list information from Service Providers. As a protocol, it is intended to be easy to understand and implement, either as a Service Provider or Consumer, using any language or platform of choice. It is also intended to be implemented by both individuals and small services as well as large providers, in any case where a service contains data about who a user knows and wishes to make that information portable, under the user's control.