? clean-output-buffer.patch
Index: xmlsitemap.pages.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/xmlsitemap/xmlsitemap.pages.inc,v
retrieving revision 1.19
diff -u -5 -p -r1.19 xmlsitemap.pages.inc
--- xmlsitemap.pages.inc	30 Aug 2010 04:47:28 -0000	1.19
+++ xmlsitemap.pages.inc	5 Jan 2011 11:33:38 -0000
@@ -125,10 +125,14 @@ function xmlsitemap_file_transfer($uri, 
 
 /**
  * Output an XML transformation file for the sitemap XML.
  */
 function xmlsitemap_output_xsl() {
+  if (ob_get_level()) {
+    ob_end_clean();
+  }
+
   // Read the XSL content from the file.
   $module_path = drupal_get_path('module', 'xmlsitemap');
   $xsl_content = file_get_contents($module_path . '/xsl/xmlsitemap.xsl');
 
   // Make sure the strings in the XSL content are translated properly.