diff -r 72874dd7eb8d -r 954f6aef52d6 RelaxNG/publiquiz.rnc
--- a/RelaxNG/publiquiz.rnc	sam. juin 13 09:36:13 2015 +0200
+++ b/RelaxNG/publiquiz.rnc	sam. juin 13 11:14:32 2015 +0200
@@ -37,7 +37,7 @@
 top.quiz = element quiz { top.quiz.attributes, top.quiz.content }
 
 top.quiz.attributes =
-   quiz.id.attribute
+   quiz.id.attribute?
  & quiz.type.attribute?
  & lang.attribute?
 quiz.id.attribute = attribute id { xsd:NMTOKEN }