diff --git a/src/MDEventsSet.php b/src/MDEventsSet.php
index 07d8f2d..7dcd1fa 100644
--- a/src/MDEventsSet.php
+++ b/src/MDEventsSet.php
@@ -84,6 +84,9 @@ final class MDEventsSet extends MDValueSet {
     // Array enthält Ereignistypen, die auf Korrespondenzen hinweisen
     public const EVENTS_CORRESPONDENCE  = [11, 13];
 
+    // List of array types that contain ownership information.
+    public const EVENTS_OWNERSHIP_RELATED = [40, 41, 42, 43, 49, 50, 56, 57, 58];
+
     /*
      * Constants for event types without places, times, actors
      */