UUID

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{{FormatInfo
 
{{FormatInfo
 
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|formattype=electronic
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A [[UUID]] (universally unique identifier) is an arbitrary 128-bit identifier, and a standard set of guidelines for generating such an identifier. The goal is that each identifer will (with overwhelming probability) be unique, without need of a central authority.
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A [[UUID]] (universally unique identifier) is an arbitrary 128-bit identifier, and a standard set of guidelines for generating such an identifier. The goal is that each identifier will (with overwhelming probability) be unique, without need of a central authority.
  
Some of the bits in a UUID are obviously not random. They are used to indicate the UUID version number, etc.
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Some of the bits in a UUID are not random, and are used to indicate the UUID version number, etc.
  
 
The standard way to display a UUID is to use [[hex encoding]], with four hyphens added at particular positions. It typically looks something like this:
 
The standard way to display a UUID is to use [[hex encoding]], with four hyphens added at particular positions. It typically looks something like this:
  00000000-1111-2222-3333-444444444444
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00000000-1111-2222-3333-444444444444
  
The Microsoft version of UUID is known as [[GUID]]. ''[TODO: Explain the difference between UUID and GUID. Supposedly there is a difference in [[endianness]], but what exactly does that mean?]''
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See also [[GUID]], the Microsoft version of UUID.
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Any UUID (or GUID) can be converted into a [[URI]] by inserting "<tt>urn:uuid:</tt>" at the beginning, and then followed by the standard form, with letters in lowercase. This allows a UUID to be represented anywhere a URI is allowed, such as the identification of a node in a [[RDF]] graph.
  
 
== Links ==
 
== Links ==
 
* RFC 4122
 
* RFC 4122
 
* [[Wikipedia:Universally unique identifier]]
 
* [[Wikipedia:Universally unique identifier]]
* [[Wikipedia:Globally unique identifier]]
 
  
 
[[Category:Naming and numbering systems]]
 
[[Category:Naming and numbering systems]]

Latest revision as of 19:28, 23 August 2017

File Format
Name UUID
Ontology

A UUID (universally unique identifier) is an arbitrary 128-bit identifier, and a standard set of guidelines for generating such an identifier. The goal is that each identifier will (with overwhelming probability) be unique, without need of a central authority.

Some of the bits in a UUID are not random, and are used to indicate the UUID version number, etc.

The standard way to display a UUID is to use hex encoding, with four hyphens added at particular positions. It typically looks something like this:

00000000-1111-2222-3333-444444444444

See also GUID, the Microsoft version of UUID.

Any UUID (or GUID) can be converted into a URI by inserting "urn:uuid:" at the beginning, and then followed by the standard form, with letters in lowercase. This allows a UUID to be represented anywhere a URI is allowed, such as the identification of a node in a RDF graph.

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