diff --git a/src/MDEventsSet.php b/src/MDEventsSet.php
index 330c4bb..074a7ee 100644
--- a/src/MDEventsSet.php
+++ b/src/MDEventsSet.php
@@ -11,7 +11,7 @@ declare(strict_types = 1);
  */
 final class MDEventsSet extends MDValueSet {
 
-    const EVENT_IDS = [
+    public const EVENT_IDS = [
         '1',  // => Created
         '2',  // => Found
         '3',  // => Published
@@ -63,26 +63,26 @@ final class MDEventsSet extends MDValueSet {
 
     ];
 
-    const EVENTS_PRODUCTION      = [1, 7, 9, 10, 19, 20, 26, 27, 28, 38, 39, 48];
+    public const EVENTS_PRODUCTION      = [1, 7, 9, 10, 19, 20, 26, 27, 28, 38, 39, 48];
 
     // Array enthält solche Ereignisse, die nach der Herstellung passiert sein müssen
-    const EVENTS_POST_PRODUCTION = [2, 3, 6, 8, 11, 13, 14, 15, 32, 34, 37, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50];
+    public const EVENTS_POST_PRODUCTION = [2, 3, 6, 8, 11, 13, 14, 15, 32, 34, 37, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50];
 
     // Array enthält solche Ereignisse, die vor der Herstellung passiert sein müssen
-    const EVENTS_PRE_PRODUCTION  = [4, 12, 25, 29, 30, 31, 35];
+    public const EVENTS_PRE_PRODUCTION  = [4, 12, 25, 29, 30, 31, 35];
 
     // Array enthält solche Ereignisse, die sich auf Objekte beziehen, die nicht hergestellt wurden
-    const EVENTS_NO_PRODUCTION   = [16, 21, 33];
+    public const EVENTS_NO_PRODUCTION   = [16, 21, 33];
 
     // Array enthält Ereignistypen, die auf Korrespondenzen hinweisen
-    const EVENTS_CORRESPONDENCE  = [11, 13];
+    public const EVENTS_CORRESPONDENCE  = [11, 13];
 
     /*
      * Constants for event types without places, times, actors
      */
-    const EVENTS_NO_TIME  = [5, 22, 23, 36];
-    const EVENTS_NO_ACTOR = [21, 22, 24, 36];
-    const EVENTS_NO_PLACE = [5, 23, 24];
+    public const EVENTS_NO_TIME  = [5, 22, 23, 36];
+    public const EVENTS_NO_ACTOR = [21, 22, 24, 36];
+    public const EVENTS_NO_PLACE = [5, 23, 24];
 
     /**
      * Gets a list of the entries in a translated version.