High Quality Content by WIKIPEDIA articles! Tag URI is a universal unique identifier protocol commonly used in various internet-related technologies and associated with data storage and transfer systems such as YAML. With reference to a given (possibly implicit) set of objects, a unique identifier (UID) is any identifier which is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. The above methods can be combined, hierarchically or singly, to create other generation schemes which guarantee uniqueness. In many cases, a single object may have more than one unique identifier, each of which identifies it for a different purpose. In relational databases, certain attributes of an entity that serve as unique identifiers are called primary keys.

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