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 <reference name="header">
            <block type="checkout/cart_sidebar" name="topcart_mini" as="topcart" template="checkout/cart/topcart.phtml"/>

            /*copy/rename  frontend\base\default\template\checkout\cart\sidebar.phtml 
            in frontend\responsive\default\template\checkout\cart\topcart.phtml
            
            /* this goes in .phtml file */
            <?php echo $this->getChildHtml('topcart'); ?>
        </reference>