If your Atom feed file fails the w3.org validator, you will get an error message explaining where the error is in your feed file. The tutorial exercise below shows you a good example.

Try to validate the following Atom feed file:

<?xml version="1.0" encoding="utf-8"?>

<feed xmlns="http://www.w3.org/2005/Atom">

<title>Webmaster GlobalGuideLine</title>

<subtitle>A place to find information for Webmasters

</subtitle>

<link href="http://GlobalGuideLine.com/atom.xml"/>

<id>http://GlobalGuideLine.com/</id>

<updated>2005-07-13T18:30:02Z</updated>

<author>

<name>GlobalGuideLine.com</name>

<email>noreply@GlobalGuideLine.com</email>

</author>

<entry>

<title>Webmaster FAQ Collection</title>

<link href="http://GlobalGuideLine.com/faq/"/>

<id>http://GlobalGuideLine.com/faq/</id>

<updated>2005-07-13T18:30:02Z</updated>

<summary>A massive collection of FAQs for Webmasters.

</summary>

</entry>

</feed>

You will get the following error message:

line 2, column 3: Missing atom:link with rel="self"

<feed xmlns="http://w