Normative references

The following documents are referenced in such a way that some or all of their content constitutes requirements of this document.

Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <>.
[RFC 3986]
Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, DOI 10.17487/RFC3986, January 2005, <>.
[RFC 5646]
Phillips, A., Ed., and M. Davis, Ed., "Tags for Identifying Languages", BCP 47, RFC 5646, DOI 10.17487/RFC5646, September 2009, <>.
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <>.
[XML 1.0]
Extensible Markup Language (XML) 1.0 (Fifth Edition), T Bray, J. Paoli, M. E. Maler, F. Yergeau, Editors, W3C Recommendation, 26 November 2008, Latest version available at
[XML 1.1]
Extensible Markup Language (XML) 1.1 (Second Edition), T. Bray, J. Paoli, M. E. Maler, F. Yergeau, J. Cowan, Editors, W3C Recommendation, 16 August 2006, Latest version available at