--- a/RelaxNG/publiquiz.rnc	dim. févr. 10 09:59:12 2013 +0100
+++ b/RelaxNG/publiquiz.rnc	lun. févr. 11 13:18:31 2013 +0100
@@ -184,8 +184,11 @@
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ categories ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 # ~~~~~~ categories
-categories = element categories { categories.content }
+categories = element categories { categories.attributes, categories.content }
 
+categories.attributes =
+   multiple.attribute?
+   
 categories.content =
    category,
    category+