<?xml version='1.0' encoding='UTF-8'?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:example="http://www.example.com/schemas/example_schema"> <!-- namespace extension -->
<url>
<example:example_tag>
...
</example:example_tag>
...
</url>
</urlset>