diff --git a/lib/FormatInterface.php b/lib/FormatInterface.php
index 2fac3fc..f99d214 100644
--- a/lib/FormatInterface.php
+++ b/lib/FormatInterface.php
@@ -1,6 +1,11 @@
 <?php
-interface FormatInterface{
+interface FormatInterface {
 	public function stringify();
 	public function display();
 	public function setItems(array $bridges);
+	public function getItems();
+	public function setExtraInfos(array $infos);
+	public function getExtraInfos();
+	public function setCharset($charset);
+	public function getCharset();
 }