DDC-645 - Demoted <change-tracking-policy /> to an attribute on <entity /> to allow better validation, fixed XSD schema

UPGRADE_TO_2_0

@@ -1,3 +1,11 @@
+# Update from 2.0-BETA3 to 2.0-BETA4
+
+## XML Driver <change-tracking-policy /> element demoted to attribute
+
+We changed how the XML Driver allows to define the change-tracking-policy. The working case is now:
+
+    <entity change-tracking-policy="DEFERRED_IMPLICT" />
+
 # Update from 2.0-BETA2 to 2.0-BETA3
 
 ## Serialization of Uninitialized Proxies

doctrine-mapping.xsd

@@ -75,6 +75,7 @@
     <xs:attribute name="schema" type="xs:NMTOKEN" />
     <xs:attribute name="repository-class" type="xs:NMTOKEN"/>
     <xs:attribute name="inheritance-type" type="orm:inheritance-type"/>
+    <xs:attribute name="change-tracking-policy" type="orm:change-tracking-policy" />
   </xs:complexType>
   
   <xs:complexType name="mapped-superclass" >
@@ -82,6 +83,14 @@
       <xs:extension base="orm:entity"/>
     </xs:complexContent>
   </xs:complexType>
+
+  <xs:simpleType name="change-tracking-policy">
+    <xs:restriction base="xs:token">
+      <xs:enumeration value="DEFERRED_IMPLICIT"/>
+      <xs:enumeration value="DEFERRED_EXPLICIT"/>
+      <xs:enumeration value="NOTIFY"/>
+    </xs:restriction>
+  </xs:simpleType>
   
   <xs:simpleType name="inheritance-type">
     <xs:restriction base="xs:token">

lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php

@@ -99,9 +99,9 @@ class XmlDriver extends AbstractFileDriver
         }
 
         // Evaluate <change-tracking-policy...>
-        if (isset($xmlRoot->{'change-tracking-policy'})) {
+        if (isset($xmlRoot['change-tracking-policy'])) {
             $metadata->setChangeTrackingPolicy(constant('Doctrine\ORM\Mapping\ClassMetadata::CHANGETRACKING_'
-                    . strtoupper((string)$xmlRoot->{'change-tracking-policy'})));
+                    . strtoupper((string)$xmlRoot['change-tracking-policy'])));
         }
 
         // Evaluate <indexes...>