glossary

Unique identifier

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(or UID): An identifier for an object which is guaranteed to be different from identifiers of all other objects in a collection. Within a database, every object will have a UID that is unique within the database. A UID assigned by a central registry (such as an ISBN for books, or a DOI for data) will be unique for all objects for which it is assigned. The http://… identifiers of linked data provide a technique for guaranteeing UIDs without a central authority.