--- a/RelaxNG/publiset.rnc	mar. juin 18 14:51:33 2013 +0200
+++ b/RelaxNG/publiset.rnc	mar. juin 18 15:44:51 2013 +0200
@@ -52,7 +52,7 @@
    remap.attributes
 
 composition.head.content =
-   (title, shorttitle?, subtitle?)?
+   (title, shorttitle?, subtitle*)?
  & (identifier, identifier?)?
  & copyright*
  & collection?
@@ -119,7 +119,7 @@
 division.head = element head { division.head.content }
 
 division.head.content =
-   (title, shorttitle?, subtitle?)?
+   (title, shorttitle?, subtitle*)?
 
 
 # =============================================================================