diff --git a/family.ttl b/family.ttl
index ccd274c22f..60d5ed69c6 100644
--- a/family.ttl
+++ b/family.ttl
@@ -1,29 +1,31 @@
 @prefix dct: <http://purl.org/dc/terms/>.
 @prefix skos: <http://www.w3.org/2004/02/skos/core#>.
-@prefix w3i: <https://w3id.org/>.
+@prefix vann: <http://purl.org/vocab/vann/>.
+@prefix dom: <https://w3id.org/>.
 
-w3i:
+dom:
     a skos:ConceptScheme;
     dct:description "My wonderful vocabulary."@en;
     dct:title "Test"@en;
-    skos:hasTopConcept w3i:51115 .
-w3i:51115
+    vann:preferredNamespaceUri dom:;
+    skos:hasTopConcept dom:51115 .
+dom:51115
     a skos:Concept;
-    skos:narrower w3i:70a6c, w3i:eea19, w3i:eedb5;
+    skos:narrower dom:70a6c, dom:eea19, dom:eedb5;
     skos:prefLabel "Family"@en;
-    skos:topConceptOf w3i: .
-w3i:70a6c
+    skos:topConceptOf dom: .
+dom:70a6c
     a skos:Concept;
-    skos:broader w3i:51115;
-    skos:inScheme w3i:;
+    skos:broader dom:51115;
+    skos:inScheme dom:;
     skos:prefLabel "Mother"@en.
-w3i:eea19
+dom:eea19
     a skos:Concept;
-    skos:broader w3i:51115;
-    skos:inScheme w3i:;
+    skos:broader dom:51115;
+    skos:inScheme dom:;
     skos:prefLabel "Child"@en.
-w3i:eedb5
+dom:eedb5
     a skos:Concept;
-    skos:broader w3i:51115;
-    skos:inScheme w3i:;
+    skos:broader dom:51115;
+    skos:inScheme dom:;
     skos:prefLabel "Father"@en.