public function getPropertyDiff(core_kernel_classes_Class $sourceClass, core_kernel_classes_Class $destinationClass)
    {
        $returnValue = array();
        $sourceProperties = $sourceClass->getProperties(true);
        $destinationProperties = $destinationClass->getProperties(true);
        foreach ($sourceProperties as $sourcePropertyUri => $sourceProperty) {
            if (!array_key_exists($sourcePropertyUri, $destinationProperties)) {
                $sourceProperty->getLabel();
                array_push($returnValue, $sourceProperty);
            }
        }
        return (array) $returnValue;
    }