Namespace Prefix Declaration |
    xmlns:prefix="namespace_URI"
This declaration associates the namespace URI given with the prefix name given. Once it has been declared, the prefix may qualify the current element name, attribute names, or any other element or attribute name within the scope of the element that declares it. Nested elements may redefine a given prefix, using a different namespace URI if desired, and XML 1.1 documents may undefine a namespace prefix by setting it to an empty string:
    xmlns:prefix="