--- a/RelaxNG/publiset.rnc	mar. janv. 01 16:57:31 2013 +0100
+++ b/RelaxNG/publiset.rnc	lun. janv. 14 19:19:33 2013 +0100
@@ -55,6 +55,7 @@
    (title, shorttitle?, subtitle?)?
  & identifier*
  & copyright?
+ & collection?
  & contributors?
  & keywordset?
  & abstract?
@@ -181,6 +182,12 @@
 
 copyright.content = inlines
 
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ collection ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+collection = element collection { collection.content }
+
+collection.content = inlines
+
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ contributors ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 # ~~~~~~ contributors