覆盖块中的itemrender-Magento

我是Magento的新手，所以如果这是个新手问题

基本上，layout.xml文件中有一个块声明如下：

<block type="checkout/cart" name="checkout.cart">
     <action method="setCartTemplate"><value>checkout/cart.phtml</value></action>
     <action method="setEmptyTemplate"><value>checkout/cart/noItems.phtml</value></action>
     <action method="chooseTemplate"/>
     <action method="addItemRender"><type>simple</type><block>checkout/cart_item_renderer</block><template>checkout/cart/item/default.phtml</template></action>
     <action method="addItemRender"><type>grouped</type><block>checkout/cart_item_renderer_grouped</block><template>checkout/cart/item/default.phtml</template></action>
     <action method="addItemRender"><type>configurable</type><block>checkout/cart_item_renderer_configurable</block><template>checkout/cart/item/default.phtml</template></action>

checkout/cart.phtml
checkout/cart/noItems.phtml
simplecheckout/cart\u item\u rendercheckout/cart/item/default.phtml
groupedcheckout/cart\u item\u renderer\u groupedcheckout/cart/item/default.phtml
configurablecheckout/cart\u item\u renderer\u configurablecheckout/cart/item/default.phtml

我想用自定义模板覆盖

simplecheckout/cart\u item\u rendercheckout/cart/item/default.phtml

既然在这里调用了一个方法，那么如何更改模板呢

非常感谢

---

模块布局文件或local.xml中的Krt_Malta

<reference name="checkout.cart">
   <action method="addItemRender">
      <type>simple</type><block>checkout/cart_item_renderer</block><template>path/to/your/item/default.phtml</template>
   </action>
</reference>