44 Digital Object Identifier (DOI®) System
CONTENTS
IDENTIFIER CONCEPTS
An identifier is a concise means of referencing something. The term “identifier” can mean several different things:
- A “string,” typically a number or name, denoting a specific entity (the referent of the identifier string). For example, the identifier ISBN 978-0-00-721331-3 denotes the book “Francis Crick” by Matt Ridley.
- A “specification,” which prescribes how such strings are constructed. For example, the ISO standard ...
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