diff --git a/doctrine-mapping.xsd b/doctrine-mapping.xsd
index 96f155a60..937d5a4ec 100644
--- a/doctrine-mapping.xsd
+++ b/doctrine-mapping.xsd
@@ -161,6 +161,7 @@
       <xs:enumeration value="SEQUENCE"/> 
       <xs:enumeration value="IDENTITY"/> 
       <xs:enumeration value="AUTO"/> 
+      <xs:enumeration value="UUID"/> 
     </xs:restriction> 
   </xs:simpleType>
   
diff --git a/lib/Doctrine/ORM/Id/UuidGenerator.php b/lib/Doctrine/ORM/Id/UuidGenerator.php
new file mode 100644
index 000000000..b4ae37773
--- /dev/null
+++ b/lib/Doctrine/ORM/Id/UuidGenerator.php
@@ -0,0 +1,48 @@
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Id;
+
+use Serializable, Doctrine\ORM\EntityManager;
+
+/**
+ * Represents an ID generator that uses the database UUID expression
+ *
+ * @since 2.3
+ * @author Maarten de Keizer <m.de.keizer@markei.nl>
+ */
+class UuidGenerator extends AbstractIdGenerator
+{
+    
+    /**
+     * Generates an ID for the given entity.
+     *
+     * @param Doctrine\ORM\EntityManager $em The EntityManager to user
+     * @param object $entity
+     * @return string The generated value.
+     * @override
+     */
+    public function generate(EntityManager $em, $entity)
+    {
+        $conn = $em->getConnection();
+        $sql = 'SELECT ' . $conn->getDatabasePlatform()->getGuidExpression();
+        return $conn->query($sql)->fetchColumn(0);
+    }
+    
+}
diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php b/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
index 815808014..54ce6ff34 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
@@ -515,6 +515,9 @@ class ClassMetadataFactory implements ClassMetadataFactoryInterface
             case ClassMetadata::GENERATOR_TYPE_NONE:
                 $class->setIdGenerator(new \Doctrine\ORM\Id\AssignedGenerator());
                 break;
+            case ClassMetadata::GENERATOR_TYPE_UUID:
+                $class->setIdGenerator(new \Doctrine\ORM\Id\UuidGenerator());
+                break;
             case ClassMetadata::GENERATOR_TYPE_TABLE:
                 throw new ORMException("TableGenerator not yet implemented.");
                 break;
diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
index 40614c7d2..a52bdb8a1 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
@@ -94,6 +94,11 @@ class ClassMetadataInfo implements ClassMetadata
      * must have a natural, manually assigned id.
      */
     const GENERATOR_TYPE_NONE = 5;
+    /**
+     * UUID means that a UUID/GUID expression is used for id generation. Full
+     * portability is currently not guaranteed.
+     */
+    const GENERATOR_TYPE_UUID = 6;
     /**
      * DEFERRED_IMPLICIT means that changes of entities are calculated at commit-time
      * by doing a property-by-property comparison with the original data. This will
@@ -1559,6 +1564,16 @@ class ClassMetadataInfo implements ClassMetadata
     {
         return $this->generatorType == self::GENERATOR_TYPE_NONE;
     }
+    
+    /**
+     * Checks whether the class use a UUID for id generation
+     *
+     * @return boolean
+     */
+    public function isIdentifierUuid()
+    {
+        return $this->generatorType == self::GENERATOR_TYPE_UUID;
+    }
 
     /**
      * Gets the type of a field.
diff --git a/tests/Doctrine/Tests/ORM/Functional/UUIDGeneratorTest.php b/tests/Doctrine/Tests/ORM/Functional/UUIDGeneratorTest.php
new file mode 100644
index 000000000..5fa237ee4
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/UUIDGeneratorTest.php
@@ -0,0 +1,48 @@
+<?php
+namespace Doctrine\Tests\ORM\Functional;
+
+/**
+ * @group DDC-451
+ */
+class UUIDGeneratorTest extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+
+        if ($this->_em->getConnection()->getDatabasePlatform()->getName() != 'mysql') {
+            $this->markTestSkipped('Currently restricted to MySQL platform.');
+        }
+
+        $this->_schemaTool->createSchema(array(
+            $this->_em->getClassMetadata(__NAMESPACE__ . '\\UUIDEntity')
+        ));
+    }
+
+    public function testGenerateUUID()
+    {
+        $entity = new UUIDEntity();
+
+        $this->_em->persist($entity);
+        $this->assertNotNull($entity->getId());
+        $this->assertTrue(strlen($entity->getId()) > 0);
+    }
+}
+
+/**
+ * @Entity
+ */
+class UUIDEntity
+{
+    /** @Id @Column(type="string") @GeneratedValue(strategy="UUID") */
+    private $id;
+    /**
+     * Get id.
+     *
+     * @return id.
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+}