Link is required on constraint

diff --git a/docbook/relaxng/src/ebnf.rnc b/docbook/relaxng/src/ebnf.rnc
index 5d4d8333cbcd3ec61b346b28615a09bb291e587c..43dc8a70d4fadc0b36c85dec80d7deda3df017bd 100644 (file)
--- a/docbook/relaxng/src/ebnf.rnc
+++ b/docbook/relaxng/src/ebnf.rnc
@@ -165,7 +165,7 @@ div {
    constraint.attlist =
       constraint.role.attribute?
     & common.attributes
-    & common.linking.attributes
+    & common.linking.attributes.req
     & local.constraint.attributes
 
    db.constraint =