What is an XML namespace name?
An XML namespace name is a URI reference that uniquely identifies the namespace. URI references are used because they are widely understood and well documented. (Note that URI references are different from URIs in that they allow fragment identifiers (#).) Because people may only allocate URIs under their control, it is easy to ensure that no two XML namespaces are identified by the same URI reference. Note: Version 1.1 of the XML namespaces recommendation uses IRI (Internationalized Resource Identifiers) references instead of URI references.
