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A UUID is 128 bits in size, in which 2 to 4 bits are used to indicate the format's variant. The most common variant in use today, OSF DCE, additionally defines 4 bits for its version. The use of the remaining bits is governed by the variant/version selected.
A UML class diagram for a strongly typed identifier. A strongly typed identifier is user-defined data type which serves as an identifier or key that is strongly typed.This is a solution to the "primitive obsession" code smell as mentioned by Martin Fowler.
A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. [1] The concept was formalized early in the development of computer science and information systems.
Unique ID for the Mifare series of chips (integrated circuits) used in contactless smart cards and proximity cards. Unique ID of a message in a folder on an IMAP server; User identifier (Unix), a code identifying each user on a Unix and Unix-like systems; Globally unique identifier (GUID) Universally unique identifier (UUID)
In computer science, a U-form is an abstract data type comprising a collection of attribute–value pairs associated with a universally-unique identifier (UUID).A U-form essentially comprises an associative array augmented with a UUID and with keys limited to strings.
It is also possible that the surrogate key exists in addition to the database-generated UUID (for example, an HR number for each employee other than the UUID of each employee). A surrogate key is frequently a sequential number (e.g. a Sybase or SQL Server "identity column", a PostgreSQL or Informix serial , an Oracle or SQL Server SEQUENCE or a ...
Message-ID is a unique identifier for a digital message, most commonly a globally unique identifier used in email and Usenet newsgroups. [1] Message-IDs are required to have a specific format which is a subset of an email address [2] and be globally unique. No two different messages must ever have the same Message-ID.
It is also used by Mach-O to identify Universal object files, and by the Java programming language to identify Java bytecode class files. It was originally created by NeXTSTEP developers as a reference to the baristas at Peet's Coffee & Tea. [4] 0xCAFED00D: 3405697037 ("cafe dude") is used by Java as a magic number for their pack200 compression ...