Sample Appcast.xml

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle"  xmlns:dc="http://purl.org/dc/elements/1.1/">
   <channel>
      <title>Your Great App's Changelog</title>
      <link>http://you.com/app/appcast.xml</link>
      <description>Most recent changes with links to updates.</description>
      <language>en</language>
         <item>
            <title>Version 2.0 (2 bugs fixed; 3 new features)</title>
						<sparkle:releaseNotesLink>
							http://you.com/app/2.0.html
						</sparkle:releaseNotesLink>
            <pubDate>Wed, 09 Jan 2006 19:20:11 +0000</pubDate>
            <enclosure url="http://you.com/app/Your Great App 2.0.zip" sparkle:version="2.0" length="1623481" type="application/octet-stream" sparkle:dsaSignature="BAFJW4B6B1K1JyW30nbkBwainOzrN6EQuAh" />
         </item>

         <item>
            <title>Version 1.5 (8 bugs fixed; 2 new features)</title>
						<sparkle:releaseNotesLink>
							http://you.com/app/1.5.html
						</sparkle:releaseNotesLink>
            <pubDate>Wed, 01 Jan 2006 12:20:11 +0000</pubDate>
            <enclosure url="http://you.com/app/Your Great App 1.5.zip" sparkle:version="1.5" length="1472893" type="application/octet-stream" sparkle:dsaSignature="234818feCa1JyW30nbkBwainOzrN6EQuAh" />
         </item>

				<!-- Now here's an example of a version with a weird internal version number (like an SVN revision) but a human-readable external one. -->
				<item>
           <title>Version 1.4 (5 bugs fixed; 2 new features)</title>
						<sparkle:releaseNotesLink>
							http://you.com/app/1.4.html
						</sparkle:releaseNotesLink>
           <pubDate>Wed, 25 Dec 2005 12:20:11 +0000</pubDate>
           <enclosure url="http://you.com/app/Your Great App 1.4.zip" sparkle:version="241" sparkle:shortVersionString="1.4" sparkle:dsaSignature="MC0CFBfeCa1JyW30nbkBwainOzrN6EQuAh=" length="1472349" type="application/octet-stream" />
        </item>
   </channel>
</rss>