Updated XSD schema

src/Symfony/Bundle/DoctrineBundle/Resources/config/schema/doctrine-1.0.xsd

@@ -93,6 +93,7 @@
             <xsd:element name="mapping" type="mapping" />
             <xsd:element name="metadata-cache-driver" type="metadata_cache_driver" minOccurs="0" maxOccurs="1" />
             <xsd:element name="dql" type="dql" minOccurs="0" maxOccurs="1" />
+            <xsd:element name="hydrator" type="type" minOccurs="0" maxOccurs="unbounded" />
         </xsd:choice>
 
         <xsd:attribute name="connection" type="xsd:string" />