Magento XML $this->getChildHtml() necessary? -


i have edited following file, move newsletter footer instead of sidebar

app/design/frontend/base/default/layout/newsletter.xml

i changed following code:

<reference name="left">         <block type="newsletter/subscribe" name="left.newsletter" template="newsletter/subscribe.phtml"/>     </reference>

to:

<reference name="footer">

why did not need add 

$this->getchildhtml('newsletter')

or similar footer.phtml? unsure when use getchildhtml() , when not to. steps necessary in exercise#2 of this article ?
thanks.

if take @ page/html/footer.phtml, footer block's template

<div class="footer-container">     <div class="footer">         <?php echo $this->getchildhtml() ?>         <p class="bugs"><?php echo $this->__('help keep magento healthy') ?> - <a href="http://www.magentocommerce.com/bug-tracking" onclick="this.target='_blank'"><strong><?php echo $this->__('report bugs') ?></strong></a> <?php echo $this->__('(ver. %s)', mage::getversion()) ?></p>         <address><?php echo $this->getcopyright() ?></address>     </div> </div>

you can see they've used following php output child blocks

<?php echo $this->getchildhtml() ?>

when getchildhtml called without parameter, output any block that's been added. that's why didn't need include own call $this->getchildhtml('newsletter')


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