From fa593c4be19447f9180cb6fc85c8f113b290c329 Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Thu, 25 Mar 2021 13:51:35 +0100
Subject: [PATCH] Add controlled list of data history subjects

Close #3
---
 src/MDDataHistorySubjectsSet.php | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/MDDataHistorySubjectsSet.php

diff --git a/src/MDDataHistorySubjectsSet.php b/src/MDDataHistorySubjectsSet.php
new file mode 100644
index 0000000..730820e
--- /dev/null
+++ b/src/MDDataHistorySubjectsSet.php
@@ -0,0 +1,30 @@
+<?PHP
+/**
+ * Contains a class for controlling the list of available subjects for data history writing.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class containing available options for data history subjects.
+ */
+final class MDDataHistorySubjectsSet extends MDValueSet {
+
+    const AVAILABLE_SUBJECTS = [
+        'appointment',
+        'collection',
+        'contact',
+        'exhibition',
+        'literature',
+        'loan',
+        'museum',
+        'object',
+        'podcast',
+        'podcast_episode',
+        'sammlung',
+        'series',
+        'user',
+    ];
+
+}