The config.xml file is used by the CMS to display the templates available to the user. It contains multiple <item> elements that contain information about each page template such as name and dimensions of the images that can be assigned to that page. When you create your theme, copy this file into /application/design/yourtheme/templates and customise it. If you want to add a new template, declare it with a new <item> element or if you want to restrict the number of templates, remove any unrequired <item> elements.
<?xml version="1.0" encoding="UTF-8"?>
<root>
<list>
<item>
<id>1</id>
<name>Standard (Default Template)</name>
<file>1.phtml</file>
<description><![CDATA[
This template doesn't support images
]]></description>
<type></type>
</item>
<item>
<id>2</id>
<name>Image on top (Default Template)</name>
<file>2.phtml</file>
<description><![CDATA[
Content image: 600 x 200 pixels
Thumbnail images: 150 x 75 pixels
]]></description>
<type></type>
</item>
<item>
<id>3</id>
<name>Image on right (Default Template)</name>
<file>3.phtml</file>
<description><![CDATA[
Content image: 300 x 300 pixels
Thumbnail images: 150 x 75 pixels
]]></description>
<type></type>
</item>
<item>
<id>4</id>
<name>Image on left (Default Template)</name>
<file>4.phtml</file>
<description><![CDATA[
Content image: 300 x 300 pixels
Thumbnail images: 150 x 75 pixels
]]></description>
<type></type>
</item>
<item>
<id>5</id>
<name>Sub-page grid (Default Template)</name>
<file>5.phtml</file>
<description><![CDATA[
Renders the Content image from sub-pages in grid format
]]></description>
<type></type>
</item>
<item>
<id>6</id>
<name>Contact Form (Default Template)</name>
<file>6.phtml</file>
<description><![CDATA[
This template doesn't support images
]]></description>
<type></type>
</item>
<item>
<id>7</id>
<name>View Helpers (Default Template)</name>
<file>7.phtml</file>
<description><![CDATA[
This template doesn't support images
]]></description>
<type></type>
</item>
</list>
</root>
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