Index: skins/MonoBook.php
===================================================================
--- skins/MonoBook.php	(revision 47963)
+++ skins/MonoBook.php	(working copy)
@@ -340,7 +340,15 @@
 			<ul>
 <?php		foreach($this->data['language_urls'] as $langlink) { ?>
 				<li class="<?php echo htmlspecialchars($langlink['class'])?>"><?php
-				?><a href="<?php echo htmlspecialchars($langlink['href']) ?>"><?php echo $langlink['text'] ?></a></li>
+				?><a
+	title="<?php echo $langlink['text'];?>"
+	rel="alternate"
+	lang="<?php echo $langlink['interwiki'];?>"
+	hreflang="<?php echo $langlink['interwiki'];?>"
+	xml:lang="<?php echo $langlink['interwiki'];?>"
+	href="<?php echo htmlspecialchars($langlink['href']) ?>">
+	<?php echo $langlink['text'] ?>
+</a></li>
 <?php		} ?>
 			</ul>
 		</div>
Index: includes/SkinTemplate.php
===================================================================
--- includes/SkinTemplate.php	(revision 47963)
+++ includes/SkinTemplate.php	(working copy)
@@ -419,7 +419,8 @@
 					$language_urls[] = array(
 						'href' => $nt->getFullURL(),
 						'text' => ($wgContLang->getLanguageName( $nt->getInterwiki()) != ''?$wgContLang->getLanguageName( $nt->getInterwiki()) : $l),
-						'class' => $class
+						'class' => $class,
+						'interwiki' => $nt->getInterwiki()
 					);
 				}
 			}