References

S. Bradner; 'Key words for use in RFCs to Indicate Requirement Levels'; RFC 2119 (Best Current Practice); March 1997; URL http://www.ietf.org/rfc/rfc2119.txt.

Unicode Consortium; 'The Unicode Standard 5.0'; 2007; URL http://www.unicode.org/versions/Unicode5.0.0/.

P. Leach, M. Mealling, and R. Salz; 'A Universally Unique IDentifier (UUID) URN Namespace'; RFC 4122 (Proposed Standard); July 2005; URL http://www.ietf.org/rfc/rfc4122.txt.