Index: wp-includes/general-template.php
===================================================================
--- wp-includes/general-template.php	(revision 6254)
+++ wp-includes/general-template.php	(working copy)
@@ -827,6 +827,7 @@
 
 function rsd_link() {
 	echo '	<link rel="EditURI" type="application/rsd+xml" title="RSD" href="' . get_bloginfo('wpurl') . "/xmlrpc.php?rsd\" />\n";
+	echo '	<link rel="service" type="application/atomsvc+xml" title="AtomPub" href="' . get_bloginfo('wpurl') . "/wp-app.php/service\" />\n";
 }
 
 function wlwmanifest_link() {
Index: xmlrpc.php
===================================================================
--- xmlrpc.php	(revision 6254)
+++ xmlrpc.php	(working copy)
@@ -32,6 +32,7 @@
       <api name="Movable Type" blogID="1" preferred="false" apiLink="<?php bloginfo_rss('wpurl') ?>/xmlrpc.php" />
       <api name="MetaWeblog" blogID="1" preferred="false" apiLink="<?php bloginfo_rss('wpurl') ?>/xmlrpc.php" />
       <api name="Blogger" blogID="1" preferred="false" apiLink="<?php bloginfo_rss('wpurl') ?>/xmlrpc.php" />
+      <api name="Atom" preferred="false" apiLink="<?php bloginfo_rss('wpurl') ?>/wp-app.php/service" />
     </apis>
   </service>
 </rsd>
Index: wp-content/themes/classic/header.php
===================================================================
--- wp-content/themes/classic/header.php	(revision 6254)
+++ wp-content/themes/classic/header.php	(working copy)
@@ -12,7 +12,7 @@
 
 	<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<?php bloginfo('rss2_url'); ?>" />
 	<link rel="alternate" type="text/xml" title="RSS .92" href="<?php bloginfo('rss_url'); ?>" />
-	<link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="<?php bloginfo('atom_url'); ?>" />
+	<link rel="alternate" type="application/atom+xml" title="Atom 1.0" href="<?php bloginfo('atom_url'); ?>" />
 
 	<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
 	<?php wp_get_archives('type=monthly&format=link'); ?>