From Just Solve the File Format Problem
(Difference between revisions)
Jump to: navigation, search
(UUID into OID)
Line 18: Line 18:
== 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

File Format

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:


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

Personal tools