Index: xmlsitemap.generate.inc
===================================================================
--- xmlsitemap.generate.inc	(revision 11199)
+++ xmlsitemap.generate.inc	(working copy)
@@ -346,6 +346,13 @@
       // sitemaps.org specification.
       $link_output .= '<priority>' . number_format($link['priority'], 1) . '</priority>';
     }
+    
+    // check if other modules want to modify our xml node
+    $altered = module_invoke_all('xmlsitemap_modify_link', $link_output, $link);
+    if ($altered[0]) {
+      $link_output = $altered[0];
+    }
+    
     $link_output .= '</url>' . PHP_EOL;
     $status &= (bool) fwrite($handle, $link_output);
   }