--- a/RelaxNG/publiset.rnc	mer. nov. 06 18:26:52 2013 +0100
+++ b/RelaxNG/publiset.rnc	mer. nov. 06 18:28:08 2013 +0100
@@ -174,6 +174,8 @@
  | (attribute type { "uri" }, for.attribute?, xsd:anyURI)
 }
 
+for.attribute = attribute for { xsd:NCName }
+
 # ~~~~~~ identifier.ean
 identifier.ean = element identifier {
    attribute type { "ean" }, for.attribute?, xsd:token {pattern = "\d{13}"}