--- a/RelaxNG/publidoc.rnc	ven. janv. 10 16:50:33 2014 +0100
+++ b/RelaxNG/publidoc.rnc	sam. janv. 11 09:05:15 2014 +0100
@@ -99,6 +99,7 @@
 
 division.head.content =
    (title, shorttitle?, subtitle*)?
+ & head.index*
  & abstract?
  & annotation*