--- a/RelaxNG/publiset.rnc	jeu. mars 14 17:40:08 2013 +0100
+++ b/RelaxNG/publiset.rnc	ven. mars 15 08:51:12 2013 +0100
@@ -54,7 +54,7 @@
 composition.head.content =
    (title, shorttitle?, subtitle?)?
  & identifier*
- & copyright?
+ & copyright*
  & collection?
  & contributors?
  & keywordset?