--- a/RelaxNG/publidoc.rnc	lun. mars 11 18:43:26 2013 +0100
+++ b/RelaxNG/publidoc.rnc	lun. mars 11 19:02:04 2013 +0100
@@ -164,6 +164,7 @@
 
 section.head.content =
    (title, shorttitle?, subtitle?)?
+ & date?
  & keywordset?
  & subjectset?
  & abstract?