UUID
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{{FormatInfo | {{FormatInfo | ||
|formattype=electronic | |formattype=electronic | ||
| − | |subcat= | + | |subcat=Elements of File Formats |
}} | }} | ||
| − | 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 | + | 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 | + | 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 | |
| − | + | See also [[GUID]], the Microsoft version of UUID. | |
| + | |||
| + | 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. | ||
| + | |||
| + | A UUID can also be convert into a [[OID]], by prefixing "<tt>2.25.</tt>" followed by the decimal representation of the 128-bit number of the UUID (as a single number, not broken up into parts). | ||
== Links == | == Links == | ||
* RFC 4122 | * RFC 4122 | ||
| + | * [https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-03 New UUID Formats] (internet draft) | ||
* [[Wikipedia:Universally unique identifier]] | * [[Wikipedia:Universally unique identifier]] | ||
| − | |||
[[Category:Naming and numbering systems]] | [[Category:Naming and numbering systems]] | ||
Latest revision as of 20:58, 30 April 2022
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.
A UUID can also be convert into a OID, by prefixing "2.25." followed by the decimal representation of the 128-bit number of the UUID (as a single number, not broken up into parts).
[edit] Links
- RFC 4122
- New UUID Formats (internet draft)
- Wikipedia:Universally unique identifier
