There are only two differences between XML namespaces 1.0 and XML namespaces 1.1:
* Version 1.1 adds a way to undeclare prefixes. For more information, see question 4.7.
* Version 1.1 uses IRIs (Internationalized Resource Identifiers)
instead of URIs. Basically, URIs are restricted to a subset of ASCII
characters, while IRIs allow much broader use of Unicode characters.
For complete details, see section 9 of Namespaces in XML 1.1.
NOTE: As of this writing (February, 2003), Namespaces in XML 1.1 is
still a candidate recommendation and not widely used. PART II:
DECLARING AND USING XML NAMESPACES