That it will never come again is what makes life so sweet.
—Emily Dickinson in “That it will never come again” (1741)
To clarify the terms used in subsequent chapters, we need to describe what an identity is and how it is used, as well as the most common events in the life of an identity.
Terminology
The concepts of an identity, an identifier, and an account are closely related but subtly different. We use the term “identifier” to refer to a single attribute whose purpose is to uniquely identify ...
