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URIs must be used for the prefix names.
A URI (Uniform Resource Identifier) is a string of characters that identifies a resource.
It can be URL (Uniform Resource Locator) or URN (Universal Resource Name).
The URL we're using is simply used as a name, for the namespace.
XML parser won't try to pull back any resources from that location.
XML parser uses it for naming the namespaces in the document.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Book List</title>
</head>
<body>
<pub:publications
xmlns:pub="http://www.java2java.com/namespaces/pub">
<pub:book>
<pub:title>Mastering XHTML</pub:title>
<pub:author>Ed Tittel</pub:author>
</pub:book>
<pub:book>
<pub:title>Java Developer?Guide to E-Commerce
with XML and JSP</pub:title>
<pub:author>William Brogden</pub:author>
</pub:book>
</pub:publications>
</body>
</html>
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