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A URI (Uniform Resource Identifier) is a string of characters that identifies a resource.
URI could be URL (Uniform Resource Locator), or URN (Universal Resource Name).
The first part of the URL specifies the protocol.
For example, here's a URL to a web page on the Internet: http://www.google.com/intl/en/about.html
A URN looks something like this: urn:foo:a123,456
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2java.com"
xmlns="http://www.java2java.com"
elementFormDefault="qualified">
<xsd:element name="name" type="xsd:string" />
<xsd:element name="source" type="xsd:string" />
</xsd:schema>
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