From 8e487d38fadc636e1902e140fcbe5c564c446bea Mon Sep 17 00:00:00 2001
From: David Maus <maus@hab.de>
Date: Wed, 31 Jan 2018 15:57:45 +0100
Subject: [PATCH] skos:notation optional

---
 src/schema/vocab.rnc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/schema/vocab.rnc b/src/schema/vocab.rnc
index e16c6b40..4d418348 100644
--- a/src/schema/vocab.rnc
+++ b/src/schema/vocab.rnc
@@ -27,7 +27,7 @@ skos.Concept =
    element skos:Concept {
       rdfPrimarySubject
     & Label+
-    & skos.notation
+    & skos.notation?
     & skos.inScheme
     & skos.match
     & empty
-- 
GitLab