Plantilla básica Joomla 3 https://docs.joomla.org/Creating_a_basic_index_file
<?xml version="1.0" encoding="utf-8"?>
<extension version="2.5" type="template">
<name>mynewtemplate</name>
<creationDate>2008-05-01</creationDate>
<author>John Doe</author>
<authorEmail>davidrenzzo@gmail.com</authorEmail>
<authorUrl>http://about.me/david_salazar</authorUrl>
<copyright>David Salazar Renzzo - 2015</copyright>
<license>GNU/GPL</license>
<version>1.0</version>
<description>My New Template</description>
<files>
<filename>index.php</filename>
<filename>templateDetails.xml</filename>
<folder>images</folder>
<folder>css</folder>
</files>
<positions>
<position>breadcrumb</position>
<position>left</position>
<position>right</position>
<position>top</position>
<position>user1</position>
<position>user2</position>
<position>user3</position>
<position>user4</position>
<position>footer</position>
</positions>
</extension>
<?php defined( '_JEXEC' ) or die( 'Restricted access' );?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<?php echo $this->language; ?>" lang="<?php echo $this->language; ?>" >
<head>
<jdoc:include type="head" />
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/system/css/system.css" type="text/css" />
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/system/css/general.css" type="text/css" />
<link rel="stylesheet" href="<?php echo $this->baseurl ?>/templates/<?php echo $this->template; ?>/css/template.css" type="text/css" />
</head>
<body>
<jdoc:include type="modules" name="top" />
<jdoc:include type="component" />
<jdoc:include type="modules" name="bottom" />
</body>
</html>