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library(uuid): Universally Unique Identifier (UUID) Library

11 library(uuid): Universally Unique Identifier (UUID) Library

See also
http://www.ossp.org/pkg/lib/uuid/
To be done
Compare UUIDs, extract time and version from UUIDs

The library provides operations on UUIDs. Please consult other sources for understanding UUIDs and the implications of the different UUID versions. Some typical calls are given below: 

?- uuid(X).
X = 'ea6589fa-19dd-11e2-8a49-001d92e1879d'.

?- uuid(X, [url('http://www.swi-prolog.org')]).
X = '73a07870-6a90-3f2e-ae2b-ffa538dc7c2c'.
[det]uuid(-UUID)
UUID is an atom representing a new UUID. This is the same as calling uuid(UUID, []). See uuid/2 for options.
[det]uuid(-UUID, +Options)
Create a new UUID according to Options. The following options are defined:
version(+Versions)
Integer in the range 1..5, which specifies the UUID version that is created. Default is 1.
dns(DNS)
url(URL)
oid(OID)
x500(X500)
Provide additional context information for UUIDs using version 3 or 5. If there is no explicit version option, UUID version 3 is used.
format(+Format)
Representation of the UUID. Default is atom, yielding atoms such as 8304efdd-bd6e-5b7c-a27f-83f3f05c64e0. The alternative is integer, returning a large integer that represents the 128 bits of the UUID.

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LogicalCaptain said (2020-09-19T00:28:36):0 upvotes 0 0 downvotes
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There is also a pack for UUIDs: https://eu.swi-prolog.org/pack/list?p=pluuid

Explanation of UUIDs at Wikipedia: https://en.wikipedia.org/wiki/Universally_unique_identifier

  • UUID Version 1: generated from 60+13 bit timestamp+clocksequence and "node ID" (generally MAC address)
  • UUID Version 2: generated from an identifier (generally group or user ID), time and node ID (generally MAC address). So-called "DCE security" UUID.
  • UUID Version 3: deterministic UUID generated by MD5-hashing a "namespace identifier and name" (e.g. an URL)
  • UUID Version 4: generated using a random or pseudo-random number
  • UUID Version 5: deterministic UUID generated by SHA1-hashing a "namespace identifier and name" (e.g. an URL)