--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/lib/Property/Unknown.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,50 @@
+<?php
+
+namespace Sabre\VObject\Property;
+
+use
+    Sabre\VObject\Property,
+    Sabre\VObject\Component,
+    Sabre\VObject\Parser\MimeDir,
+    Sabre\VObject\Document;
+
+/**
+ * Unknown property
+ *
+ * This object represents any properties not recognized by the parser.
+ * This type of value has been introduced by the jCal, jCard specs.
+ *
+ * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Unknown extends Text {
+
+    /**
+     * Returns the value, in the format it should be encoded for json.
+     *
+     * This method must always return an array.
+     *
+     * @return array
+     */
+    public function getJsonValue() {
+
+        return array($this->getRawMimeDirValue());
+
+    }
+
+    /**
+     * Returns the type of value.
+     *
+     * This corresponds to the VALUE= parameter. Every property also has a
+     * 'default' valueType.
+     *
+     * @return string
+     */
+    public function getValueType() {
+
+        return "UNKNOWN";
+
+    }
+
+}