/usr/lib/swipl/library/ext/clib/uuid.pl
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 uuid(-UUID, +Options) is det
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.

If SWI-Prolog was not built with the OSSP UUID dependency library a simple Prolog alternative that only implements version 4 random UUIDs is provided. In this case the default version is 4 and the only admissible options are version(4) and format(Format).