small update trying to add an API to get useful error informations back

* TODO: small update
* xmlregexp.c: trying to add an API to get useful error informations
  back from a failing regexp context.
Daniel
diff --git a/TODO b/TODO
index e348834..9c32224 100644
--- a/TODO
+++ b/TODO
@@ -39,7 +39,7 @@
 - Stricten the UTF8 conformance (Martin Duerst):
   http://www.w3.org/2001/06/utf-8-test/.
   The bad files are in http://www.w3.org/2001/06/utf-8-wrong/.
-  
+- xml:id normalized value
 
 TODO:
 =====