diff --git a/ontology/uco/types/types.ttl b/ontology/uco/types/types.ttl
index aa9574f6..862e0b07 100644
--- a/ontology/uco/types/types.ttl
+++ b/ontology/uco/types/types.ttl
@@ -288,6 +288,7 @@ types:threadOriginItem
 types:threadOriginItem-subjects-shape
 	a sh:PropertyShape ;
 	sh:class types:ThreadItem ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path types:threadOriginItem ;
 	sh:targetSubjectsOf types:threadOriginItem ;
 	.
@@ -296,6 +297,7 @@ types:threadOriginItem-subjects-threadPredecessor-shape
 	a sh:PropertyShape ;
 	sh:description "An origin item in a thread must not have a predecessor."@en ;
 	sh:maxCount "0"^^xsd:integer ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path (
 		types:threadOriginItem
 		types:threadPredecessor
@@ -307,6 +309,7 @@ types:threadOriginItem-subjects-threadPreviousItem-shape
 	a sh:PropertyShape ;
 	sh:description "An origin item in a thread must not have a previous item."@en ;
 	sh:maxCount "0"^^xsd:integer ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path (
 		types:threadOriginItem
 		types:threadPreviousItem
@@ -395,6 +398,7 @@ types:threadTerminalItem
 types:threadTerminalItem-subjects-shape
 	a sh:PropertyShape ;
 	sh:class types:ThreadItem ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path types:threadTerminalItem ;
 	sh:targetSubjectsOf types:threadTerminalItem ;
 	.
@@ -403,6 +407,7 @@ types:threadTerminalItem-subjects-threadNextItem-shape
 	a sh:PropertyShape ;
 	sh:description "A terminal item in a thread must not have a next item."@en ;
 	sh:maxCount "0"^^xsd:integer ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path (
 		types:threadTerminalItem
 		types:threadNextItem
@@ -414,6 +419,7 @@ types:threadTerminalItem-subjects-threadSuccessor-shape
 	a sh:PropertyShape ;
 	sh:description "A terminal item in a thread must not have a successor."@en ;
 	sh:maxCount "0"^^xsd:integer ;
+	sh:nodeKind sh:BlankNodeOrIRI ;
 	sh:path (
 		types:threadTerminalItem
 		types:threadSuccessor