diff --git a/src/MDAppointmentRecordingSet.php b/src/MDAppointmentRecordingSet.php
new file mode 100644
index 0000000..97cd8d6
--- /dev/null
+++ b/src/MDAppointmentRecordingSet.php
@@ -0,0 +1,17 @@
+<?PHP
+/**
+ * Contains a class for controlling the list of available recording types and sources.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class containing available units for weights, lengths etc.
+ */
+final class MDAppointmentRecordingSet extends MDValueSet {
+
+    const AVAILABLE_RECORDING_TYPES = ['video'];
+    const EXTERNAL_SOURCES = ['Archive.org' => 'https://archive.org/details/'];
+
+}