Hello,
I remove one of Joomla plugin, and I've reach one step forward.
Now only one url in the sitemap : the base url.
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="[ External links are visible to forum administrators only ]"?>
<urlset
xmlns="[ External links are visible to forum administrators only ]"
xmlns:xsi="[ External links are visible to forum administrators only ]"
xsi:schemaLocation="
[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]">
<!-- created with Standalone Sitemap Generator
www.xml-sitemaps.com (30185) -->
<url>
<loc>[ External links are visible to forum administrators only ]</loc>
<lastmod>2012-09-22T12:19:11+00:00</lastmod>
<changefreq>hourly</changefreq>
<priority>1.0000</priority>
</url>
</urlset>