This presentation: http://www.cafeconleche.org/slides/xmlone/london2002/namespaces/
XML in a Nutshell
Elliotte Rusty Harold and W. Scott Means
O'Reilly & Associates, 2001
ISBN 0-596-00058-8
XML Bible, Gold edition
Elliotte Rusty Harold
Hungry Minds, 2001
ISBN 0-7645-4819-0
Chapter 13: Namespaces
Chapter 28: RDDL
Who's Jon Johansen? http://www.eff.org/IP/DeCSS_prosecutions/Johansen_DeCSS_case/