This is a story about and . We explicitly reference and we explicitly don't reference Namespaces in XML 1.1. XML 1.0 Extensible Markup Language (XML) 1.0 (Fourth Edition). Tim Bray, Jean Paoli, C. M. Sperberg-McQueen, et. al. editors. W3C Recommendation 16 August 2006. Namespaces 1.0 Namespaces in XML 1.0 (Second Edition). Tim Bray, Dave Hollander, Andrew Layman, et. al., editors. W3C Recommendation 16 August 2006. XML 1.1 Extensible Markup Language (XML) 1.1 (Second Edition). Tim Bray, Jean Paoli, C. M. Sperberg-McQueen, et. al. editors. W3C Recommendation 16 August 2006. Namespaces 1.1 Namespaces in XML 1.1 (Second Edition). Tim Bray, Dave Hollander, Andrew Layman, et. al., editors. W3C Recommendation 16 August 2006.