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Declaring namespaces
This namespace declaration associates the prefix ucedu with the URL http://www.ucedu.org/names to declare a namespace.
We can use the prefix defined to uniquely identify the elements of the XML document as belonging to the namespace specified here. The element names have now been changed.
An alternative namespace declaration does not use a prefix. In this case, the namespace is a default namespace and a prefix is not used to refer to the elements that belong to that namespace.