Add controlled lists of recording types and external hosting options

src/MDExternalHostingSet.php

@@ -0,0 +1,20 @@
+<?PHP
+/**
+ * Contains a class for controlling the list of available external sources.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class containing available external sources.
+ */
+final class MDExternalHostingSet extends MDValueSet {
+
+    const DEFAULT_EXTERNAL_HOSTING = 'Archive.org';
+
+    const EXTERNAL_SOURCES = [
+        'Archive.org',
+    ];
+
+}

src/MDRecordingTypesSet.php

@@ -0,0 +1,32 @@
+<?PHP
+/**
+ * Contains a class for controlling the list of available recording types.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class containing available recording types.
+ */
+final class MDRecordingTypesSet extends MDValueSet {
+
+    const DEFAULT_RECORDING_TYPE = 'audio';
+
+    const RECORDING_TYPES = [
+        'audio',
+        'video',
+    ];
+
+    /**
+     * Gets a list of the entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string>
+     */
+    public static function getSortedList(MDTlLoader $tlLoader):array {
+        return parent::getTlSortedList($tlLoader, self::RECORDING_TYPES, "recording_types_set", "recording_types_set");
+
+    }
+}