remove the comment from the testphase

Metadata/Driver/XmlDriver.php

@@ -168,7 +168,7 @@ class XmlDriver extends AbstractFileDriver
 
                     //we need read-only before setter and getter set, because that method depends on flag being set
                     if (null !== $readOnly = $pElem->attributes()->{'read-only'}) {
-                        //$pMetadata->readOnly = 'true' === strtolower($readOnly);
+                        $pMetadata->readOnly = 'true' === strtolower($readOnly);
                     }
 
                     $getter = $pElem->attributes()->{'accessor-getter'};