It shows how to refer to the XML Schema from the instance document.
You used the XML Schema to determine whether your instance document was schema valid.
File: Schema.xsd
xmlns:target="http://www.rntsoft.com/name"
targetNamespace="http://www.rntsoft.com/name"
elementFormDefault="qualified">
File: Data.xsl
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.rntsoft.com/name name5.xsd"
title="Mr.">
John
Joh
Doe