Allowed SaturdayDelivery option on national boxes

Bpost/Order/Box/Option/SaturdayDelivery.php

@@ -0,0 +1,33 @@
+<?php
+namespace TijsVerkoyen\Bpost\Bpost\Order\Box\Option;
+
+use DOMDocument;
+use DomElement;
+
+/**
+ * bPost SaturdayDelivery class
+ *
+ * @author    Tijs Verkoyen <php-bpost@verkoyen.eu>
+ * @version   3.0.0
+ * @copyright Copyright (c), Tijs Verkoyen. All rights reserved.
+ * @license   BSD License
+ */
+class SaturdayDelivery extends Option
+{
+    /**
+     * Return the object as an array for usage in the XML
+     *
+     * @param  DomDocument $document
+     * @param  string      $prefix
+     * @return DomElement
+     */
+    public function toXML(DOMDocument $document, $prefix = 'common')
+    {
+        $tagName = 'saturdayDelivery';
+        if ($prefix !== null) {
+            $tagName = $prefix . ':' . $tagName;
+        }
+
+        return $document->createElement($tagName);
+    }
+}