XML can
be used in your application in a variety of ways. One of the most common
uses is in content management system for many web applications. In such
content management system, you can design your dynamic pages in such
a way that the content for the pages are got from the different elements
of the XML document.
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You
can create an admin interface that helps you to edit the content of
the XML document and update the elements of the XML document so that
the changes are reflected in the web pages.
This is
one common use where people who contribute to the content of the website
need not know anything about HTML or other programming languages. They
can simply use the admin interface to edit and post the content for
the web site.
Similarly
there are many ways in which you can use the XML document in your web
applications. A simple search on the internet would give you ideas on
how to use XML in your applications.