diff --git a/src/Symfony/Component/HttpFoundation/Session/Session.php b/src/Symfony/Component/HttpFoundation/Session/Session.php
index c68bd30fce..cbadcd38a2 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Session.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Session.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\HttpFoundation\Session;
 
-use Symfony\Component\HttpFoundation\Session\Storage\MetaBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
 use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface;
@@ -212,9 +212,9 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
     /**
      * {@iheritdoc}
      */
-    public function getMetadata()
+    public function getMetadataBag()
     {
-        return $this->storage->getMetaBag();
+        return $this->storage->getMetadataBag();
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php b/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
index bfd7f6abb8..15b4c2924c 100644
--- a/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
+++ b/src/Symfony/Component/HttpFoundation/Session/SessionInterface.php
@@ -193,7 +193,7 @@ interface SessionInterface
     /**
      * Gets session meta.
      *
-     * @return MetaBag
+     * @return MetadataBag
      */
-    public function getMeta();
+    public function getMetadataBag();
 }
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/MetaBag.php b/src/Symfony/Component/HttpFoundation/Session/Storage/MetadataBag.php
similarity index 72%
rename from src/Symfony/Component/HttpFoundation/Session/Storage/MetaBag.php
rename to src/Symfony/Component/HttpFoundation/Session/Storage/MetadataBag.php
index 0bb160f843..892d004b5d 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/MetaBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/MetadataBag.php
@@ -16,16 +16,20 @@ use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
 /**
  * Metadata container.
  *
- * Adds meta data to the session.
+ * Adds metadata to the session.
  *
  * @author Drak <drak@zikula.org>
  */
-class MetaBag implements SessionBagInterface
+class MetadataBag implements SessionBagInterface
 {
+    const CREATED = 'c';
+    const UPDATED = 'u';
+    const LIFETIME = 'l';
+
     /**
      * @var string
      */
-    private $name = '__meta';
+    private $name = '__metadata';
 
     /**
      * @var string
@@ -52,19 +56,19 @@ class MetaBag implements SessionBagInterface
     public function __construct($storageKey = '_sf2_meta')
     {
         $this->storageKey = $storageKey;
-        $this->meta = array('created' => 0, 'lastused' => 0, 'lifetime' => 0);
+        $this->meta = array(self::CREATED => 0, self::UPDATED => 0, self::LIFETIME => 0);
     }
 
     /**
      * {@inheritdoc}
      */
-    public function initialize(array &$meta)
+    public function initialize(array &$array)
     {
-        $this->meta = &$meta;
+        $this->meta = &$array;
 
-        if (isset($meta['created'])) {
-            $this->lastUsed = $this->meta['lastused'];
-            $this->meta['lastused'] = time();
+        if (isset($array[self::CREATED])) {
+            $this->lastUsed = $this->meta[self::UPDATED];
+            $this->meta[self::UPDATED] = time();
         } else {
             $this->stampCreated();
         }
@@ -77,11 +81,11 @@ class MetaBag implements SessionBagInterface
      */
     public function getLifetime()
     {
-        return $this->meta['lifetime'];
+        return $this->meta[self::LIFETIME];
     }
 
     /**
-     * Stamps a new session's meta.
+     * Stamps a new session's metadata.
      *
      * @param integer $lifetime Sets the cookie lifetime for the session cookie. A null value
      *                          will leave the system settings unchanged, 0 sets the cookie
@@ -102,17 +106,17 @@ class MetaBag implements SessionBagInterface
     }
 
     /**
-     * Gets the created timestamp meta data.
+     * Gets the created timestamp metadata.
      *
      * @return integer Unix timestamp
      */
     public function getCreated()
     {
-        return $this->meta['created'];
+        return $this->meta[self::CREATED];
     }
 
     /**
-     * Gets the last used meta data.
+     * Gets the last used metadata.
      *
      * @return integer Unix timestamp
      */
@@ -150,7 +154,7 @@ class MetaBag implements SessionBagInterface
     private function stampCreated($lifetime = null)
     {
         $timeStamp = time();
-        $this->meta['created'] = $this->meta['lastused'] = $this->lastUsed = $timeStamp;
-        $this->meta['lifetime'] = (null === $lifetime) ? ini_get('session.cookie_lifetime') : $lifetime;
+        $this->meta[self::CREATED] = $this->meta[self::UPDATED] = $this->lastUsed = $timeStamp;
+        $this->meta[self::LIFETIME] = (null === $lifetime) ? ini_get('session.cookie_lifetime') : $lifetime;
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
index f77116a014..5500a03419 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/MockArraySessionStorage.php
@@ -12,7 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Session\Storage;
 
 use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
-use Symfony\Component\HttpFoundation\Session\Storage\MetaBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
 
 /**
  * MockArraySessionStorage mocks the session for unit tests.
@@ -54,20 +54,20 @@ class MockArraySessionStorage implements SessionStorageInterface
     protected $data = array();
 
     /**
-     * @var MetaBag
+     * @var MetadataBag
      */
-    protected $metaBag;
+    protected $metadataBag;
 
     /**
      * Constructor.
      *
      * @param string  $name    Session name
-     * @param MetaBag $metaBag MetaBag instance.
+     * @param MetadataBag $metaBag MetadataBag instance.
      */
-    public function __construct($name = 'MOCKSESSID', MetaBag $metaBag = null)
+    public function __construct($name = 'MOCKSESSID', MetadataBag $metaBag = null)
     {
         $this->name = $name;
-        $this->setMetaBag($metaBag);
+        $this->setMetadataBag($metaBag);
     }
 
     /**
@@ -107,7 +107,7 @@ class MockArraySessionStorage implements SessionStorageInterface
             $this->start();
         }
 
-        $this->metaBag->stampNew($lifetime);
+        $this->metadataBag->stampNew($lifetime);
         $this->id = $this->generateId();
 
         return true;
@@ -200,27 +200,27 @@ class MockArraySessionStorage implements SessionStorageInterface
     }
 
     /**
-     * Sets the metabag.
+     * Sets the MetadataBag.
      *
-     * @param MetaBag $metaBag
+     * @param MetadataBag $bag
      */
-    public function setMetaBag(MetaBag $metaBag = null)
+    public function setMetadataBag(MetadataBag $bag = null)
     {
-        if (null === $metaBag) {
-            $metaBag = new MetaBag();
+        if (null === $bag) {
+            $bag = new MetadataBag();
         }
 
-        $this->metaBag = $metaBag;
+        $this->metadataBag = $bag;
     }
 
     /**
-     * Gets the MetaBag.
+     * Gets the MetadataBag.
      *
-     * @return MetaBag
+     * @return MetadataBag
      */
-    public function getMetaBag()
+    public function getMetadataBag()
     {
-        return $this->metaBag;
+        return $this->metadataBag;
     }
 
     /**
@@ -238,7 +238,7 @@ class MockArraySessionStorage implements SessionStorageInterface
 
     protected function loadSession()
     {
-        $bags = array_merge($this->bags, array($this->metaBag));
+        $bags = array_merge($this->bags, array($this->metadataBag));
 
         foreach ($bags as $bag) {
             $key = $bag->getStorageKey();
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
index 72b3f5c79a..215ed26ab0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
@@ -12,7 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Session\Storage;
 
 use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
-use Symfony\Component\HttpFoundation\Session\Storage\MetaBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\NativeProxy;
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\AbstractProxy;
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy;
@@ -47,9 +47,9 @@ class NativeSessionStorage implements SessionStorageInterface
     protected $saveHandler;
 
     /**
-     * @var MetaBag
+     * @var MetadataBag
      */
-    protected $metaBag;
+    protected $metadataBag;
 
     /**
      * Constructor.
@@ -91,9 +91,9 @@ class NativeSessionStorage implements SessionStorageInterface
      *
      * @param array   $options Session configuration options.
      * @param object  $handler SessionHandlerInterface.
-     * @param MetaBag $handler MetaBag.
+     * @param MetadataBag $handler MetadataBag.
      */
-    public function __construct(array $options = array(), $handler = null, MetaBag $metaBag = null)
+    public function __construct(array $options = array(), $handler = null, MetadataBag $metaBag = null)
     {
         // sensible defaults
         ini_set('session.auto_start', 0); // by default we prefer to explicitly start the session using the class.
@@ -106,7 +106,7 @@ class NativeSessionStorage implements SessionStorageInterface
             register_shutdown_function('session_write_close');
         }
 
-        $this->setMetaBag($metaBag);
+        $this->setMetadataBag($metaBag);
         $this->setOptions($options);
         $this->setSaveHandler($handler);
     }
@@ -202,7 +202,7 @@ class NativeSessionStorage implements SessionStorageInterface
         }
 
         if ($destroy) {
-            $this->metaBag->stampNew();
+            $this->metadataBag->stampNew();
         }
 
         return session_regenerate_id($destroy);
@@ -266,27 +266,27 @@ class NativeSessionStorage implements SessionStorageInterface
     }
 
     /**
-     * Sets the metabag.
+     * Sets the MetadataBag.
      *
-     * @param MetaBag $metaBag
+     * @param MetadataBag $metaBag
      */
-    public function setMetaBag(MetaBag $metaBag = null)
+    public function setMetadataBag(MetadataBag $metaBag = null)
     {
         if (null === $metaBag) {
-            $metaBag = new MetaBag();
+            $metaBag = new MetadataBag();
         }
 
-        $this->metaBag = $metaBag;
+        $this->metadataBag = $metaBag;
     }
 
     /**
-     * Gets the MetaBag.
+     * Gets the MetadataBag.
      *
-     * @return MetaBag
+     * @return MetadataBag
      */
-    public function getMetaBag()
+    public function getMetadataBag()
     {
-        return $this->metaBag;
+        return $this->metadataBag;
     }
 
     /**
@@ -378,7 +378,7 @@ class NativeSessionStorage implements SessionStorageInterface
             $session = &$_SESSION;
         }
 
-        $bags = array_merge($this->bags, array($this->metaBag));
+        $bags = array_merge($this->bags, array($this->metadataBag));
 
         foreach ($bags as $bag) {
             $key = $bag->getStorageKey();
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/SessionStorageInterface.php b/src/Symfony/Component/HttpFoundation/Session/Storage/SessionStorageInterface.php
index 1c1014b89f..20c533c2eb 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/SessionStorageInterface.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/SessionStorageInterface.php
@@ -12,7 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Session\Storage;
 
 use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
-use Symfony\Component\HttpFoundation\Session\Storage\MetaBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
 
 /**
  * StorageInterface.
@@ -130,7 +130,7 @@ interface SessionStorageInterface
     function registerBag(SessionBagInterface $bag);
 
     /**
-     * @return MetaBag
+     * @return MetadataBag
      */
-    function getMetaBag();
+    function getMetadataBag();
 }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
index cb903369c6..bd45b2fbe6 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
@@ -12,7 +12,7 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session;
 
 use Symfony\Component\HttpFoundation\Session\Session;
-use Symfony\Component\HttpFoundation\Session\MetaBag;
+use Symfony\Component\HttpFoundation\Session\MetadataBag;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
@@ -257,6 +257,6 @@ class SessionTest extends \PHPUnit_Framework_TestCase
 
     public function testGetMeta()
     {
-        $this->assertInstanceOf('Symfony\Component\HttpFoundation\Session\Storage\MetaBag', $this->session->getMeta());
+        $this->assertInstanceOf('Symfony\Component\HttpFoundation\Session\Storage\MetadataBag', $this->session->getMetadataBag());
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetaBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetadataBagTest.php
similarity index 79%
rename from src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetaBagTest.php
rename to src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetadataBagTest.php
index a3b578c4cb..39f268b4b5 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetaBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MetadataBagTest.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\HttpFoundation\Tests\Session\Storage;
 
-use Symfony\Component\HttpFoundation\Session\Storage\MetaBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
 
 /**
- * Test class for MetaBag.
+ * Test class for MetadataBag.
  */
-class MetaBagTest extends \PHPUnit_Framework_TestCase
+class MetadataBagTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * @var MetaBag
+     * @var MetadataBag
      */
     protected $bag;
 
@@ -30,8 +30,8 @@ class MetaBagTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        $this->bag = new MetaBag();
-        $this->array = array('created' => 1234567, 'lastused' => 12345678);
+        $this->bag = new MetadataBag();
+        $this->array = array(MetadataBag::CREATED => 1234567, MetadataBag::UPDATED => 12345678, MetadataBag::LIFETIME => 0);
         $this->bag->initialize($this->array);
     }
 
@@ -43,17 +43,17 @@ class MetaBagTest extends \PHPUnit_Framework_TestCase
 
     public function testInitialize()
     {
-        $p = new \ReflectionProperty('Symfony\Component\HttpFoundation\Session\Storage\MetaBag', 'meta');
+        $p = new \ReflectionProperty('Symfony\Component\HttpFoundation\Session\Storage\MetadataBag', 'meta');
         $p->setAccessible(true);
 
-        $bag1 = new MetaBag();
+        $bag1 = new MetadataBag();
         $array = array();
         $bag1->initialize($array);
         $this->assertGreaterThanOrEqual(time(), $bag1->getCreated());
         $this->assertEquals($bag1->getCreated(), $bag1->getLastUsed());
 
         sleep(1);
-        $bag2 = new MetaBag();
+        $bag2 = new MetadataBag();
         $array2 = $p->getValue($bag1);
         $bag2->initialize($array2);
         $this->assertEquals($bag1->getCreated(), $bag2->getCreated());
@@ -61,7 +61,7 @@ class MetaBagTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($bag2->getCreated(), $bag2->getLastUsed());
 
         sleep(1);
-        $bag3 = new MetaBag();
+        $bag3 = new MetadataBag();
         $array3 = $p->getValue($bag2);
         $bag3->initialize($array3);
         $this->assertEquals($bag1->getCreated(), $bag3->getCreated());
@@ -71,7 +71,7 @@ class MetaBagTest extends \PHPUnit_Framework_TestCase
 
     public function testGetSetName()
     {
-        $this->assertEquals('__meta', $this->bag->getName());
+        $this->assertEquals('__metadata', $this->bag->getName());
         $this->bag->setName('foo');
         $this->assertEquals('foo', $this->bag->getName());