public abstract class UUIDGenFactory
A Universally Unique Identifier (UUID) is a 128 bit number generated
according to an algorithm that is garanteed to be unique in time and space
from all other UUIDs. It consists of an IEEE 802 Internet Address and
various time stamps to ensure uniqueness. For a complete specification,
see ftp://ietf.org/internet-drafts/draft-leach-uuids-guids-01.txt [leach].