How to implement it?
Example for the file views-view-field--frontpage--newsrss--body-2.tpl.php
Sometimes it's necessary.
Image sitemap information helps Google discover images, and allows you to indicate images on your site that you want Google to crawl and index. You can use a separate sitemap to list images.
The maintenance page is used when the site is set in off-line mode. You can enable this mode from "Administer > Site configuration > Site maintenance".
Check if the current page is the front page.
Drupal 7 has introduced several new techniques that allow you far greater flexibility and control in the scripts you can have on your Drupal site's pages.
Here are the tips.