Index: modules/system/page.tpl.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/page.tpl.php,v
retrieving revision 1.17
diff -u -p -r1.17 page.tpl.php
--- modules/system/page.tpl.php	24 Feb 2009 17:50:22 -0000	1.17
+++ modules/system/page.tpl.php	2 Mar 2009 18:11:03 -0000
@@ -21,6 +21,8 @@
  * - $language: (object) The language the site is being displayed in.
  *   $language->language contains its textual representation.
  *   $language->dir contains the language direction. It will either be 'ltr' or 'rtl'.
+ * - $rdf_namespaces: All the RDF namespace prefixes used in the HTML document.
+ * - $grddl_profile: A GRDDL profile allowing agents to extract the RDF data.
  * - $head_title: A modified version of the page title, for use in the TITLE tag.
  * - $head: Markup for the HEAD section (including meta tags, keyword tags, and
  *   so on).
@@ -71,11 +73,12 @@
  * @see template_preprocess_page()
  */
 ?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<?php print $language->language; ?>" lang="<?php print $language->language; ?>" dir="<?php print $language->dir; ?>">
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN"
+  "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<?php print $language->language; ?>" dir="<?php print $language->dir; ?>"
+  <?php print $rdf_namespaces; ?>>
 
-<head>
+<head profile="<?php print $grddl_profile; ?>">
   <title><?php print $head_title; ?></title>
   <?php print $head; ?>
   <?php print $styles; ?>
