* @since 1.21
* @param int $index Index to check
* @return null|string Default model name for the given namespace, if set
*/
public static function getNamespaceContentModel( $index ) {
* @since 1.21
* @param int $index Index to check
* @return null|string Default model name for the given namespace, if set
*/
public static function getNamespaceContentModel( $index ) {