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+Uuid
+==
+
+.. versionadded:: 2.5
+    The Uuid constraint was added in Symfony 2.5.
+
+Validates that a value is a valid `Universally unique identifier (UUID)`_ per `RFC 4122`_.
+By default, this will validate the format according to the RFC's guidelines, but this can
+be relaxed to accept non-standard UUIDs that other systems (like PostgreSQL) accept.
+UUID versions can also be restricted using a whitelist.
+
++----------------+---------------------------------------------------------------------+
+| Applies to     | :ref:`property or method <validation-property-target>`              |
++----------------+---------------------------------------------------------------------+
+| Options        | - `message`_                                                        |
+|                | - `strict`_                                                         |
+|                | - `versions`_                                                       |
++----------------+---------------------------------------------------------------------+
+| Class          | :class:`Symfony\\Component\\Validator\\Constraints\\Uuid`           |
++----------------+---------------------------------------------------------------------+
+| Validator      | :class:`Symfony\\Component\\Validator\\Constraints\\UuidValidator`  |
++----------------+---------------------------------------------------------------------+
+
+Basic Usage
+-----------
+
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        # src/UploadsBundle/Resources/config/validation.yml
+        Acme\UploadsBundle\Entity\File:
+            properties:
+                identifier:
+                    - Uuid: ~
+
+    .. code-block:: php-annotations
+
+        // src/Acme/UploadsBundle/Entity/File.php
+        namespace Acme\UploadsBundle\Entity;
+
+        use Symfony\Component\Validator\Constraints as Assert;
+
+        class File
+        {
+            /**
+             * @Assert\Uuid
+             */
+             protected $identifier;
+        }
+
+    .. code-block:: xml
+
+        <!-- src/Acme/UploadsBundle/Resources/config/validation.xml -->
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
+
+            <class name="Acme\UploadsBundle\Entity\File">
+                <property name="identifier">
+                    <constraint name="Uuid" />
+                </property>
+            </class>
+        </constraint-mapping>
+
+    .. code-block:: php
+
+        // src/Acme/UploadsBundle/Entity/File.php
+        namespace Acme\UploadsBundle\Entity;
+
+        use Symfony\Component\Validator\Mapping\ClassMetadata;
+        use Symfony\Component\Validator\Constraints as Assert;
+
+        class File
+        {
+            public static function loadValidatorMetadata(ClassMetadata $metadata)
+            {
+                $metadata->addPropertyConstraint('identifier', new Assert\Uuid());
+            }
+        }
+
+
+Options
+-------
+
+message
+~~~~~~~
+
+**type**: ``string`` **default**: ``This is not a valid UUID.``
+
+This message is shown if the string is not a valid UUID.
+
+strict
+~~~~~~
+
+**type**: ``boolean`` **default**: ``true``
+
+If this option is set to ``true`` the constraint will check if the UUID is formatted per the
+RFC's input format rules: ``216fff40-98d9-11e3-a5e2-0800200c9a66``.  Setting this to ``false``
+will allow alternate input formats like::
+
+  216f-ff40-98d9-11e3-a5e2-0800-200c-9a66
+  {216fff40-98d9-11e3-a5e2-0800200c9a66}
+  216fff4098d911e3a5e20800200c9a66
+
+versions
+~~~~~~~~
+
+**type**: ``int[]`` **default**: ``[1,2,3,4,5]``
+
+This option can be used to only allow specific `UUID versions`_.  Valid versions are 1 - 5.
+The following PHP constants can also be used:
+
+* ``Uuid::V1_MAC``
+* ``Uuid::V2_DCE``
+* ``Uuid::V3_MD5``
+* ``Uuid::V4_RANDOM``
+* ``Uuid::V5_SHA1``
+
+All five versions are allowed by default.
+
+.. _`Universally unique identifier (UUID)`: http://en.wikipedia.org/wiki/Universally_unique_identifier
+.. _`RFC 4122`: http://tools.ietf.org/html/rfc4122
+.. _`UUID versions`: http://en.wikipedia.org/wiki/Universally_unique_identifier#Variants_and_versions
+