--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Attribute;
+
+use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
+
+/**
+ * Attributes store.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+interface AttributeBagInterface extends SessionBagInterface
+{
+ /**
+ * Checks if an attribute is defined.
+ *
+ * @param string $name The attribute name
+ *
+ * @return bool true if the attribute is defined, false otherwise
+ */
+ public function has($name);
+
+ /**
+ * Returns an attribute.
+ *
+ * @param string $name The attribute name
+ * @param mixed $default The default value if not found
+ *
+ * @return mixed
+ */
+ public function get($name, $default = null);
+
+ /**
+ * Sets an attribute.
+ *
+ * @param string $name
+ * @param mixed $value
+ */
+ public function set($name, $value);
+
+ /**
+ * Returns attributes.
+ *
+ * @return array Attributes
+ */
+ public function all();
+
+ /**
+ * Sets attributes.
+ *
+ * @param array $attributes Attributes
+ */
+ public function replace(array $attributes);
+
+ /**
+ * Removes an attribute.
+ *
+ * @param string $name
+ *
+ * @return mixed The removed value or null when it does not exist
+ */
+ public function remove($name);
+}