Centralize getSortedList in parent class

src/MDMarkingTypesSet.php

@@ -8,7 +8,7 @@
 /**
  * Class containing available marking types.
  */
-class MDMarkingTypesSet {
+class MDMarkingTypesSet extends MDValueSet {
 
     const MARKING_TYPES = [
         'signature',
@@ -21,4 +21,16 @@ class MDMarkingTypesSet {
         'handwritten',
     ];
 
+    /**
+     * Gets a sorted list of the entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string>
+     */
+    public static function getSortedList(MDTlLoader $tlLoader):array {
+        return parent::getSortedList($tlLoader, self::MARKING_TYPES, "marking_types", "marking_types");
+
+    }
+
 }