# File lib/json-schema/uri/uuid.rb, line 90
                def create_md5 str, namespace
                        md5 = Digest::MD5.new
                        md5.update namespace.raw_bytes
                        md5.update str
                        sum = md5.digest
                        raw = mask 3, sum[0..16]
                        ret = new raw
                        ret.freeze
                        ret
                end