The Magento production is configured to automatically generate the sitemap.xml, as is the url is taken as a base, it is important to be ignored.
@@ -104,6 +104,7 @@ shell/abstract.php
shell/compiler.php
shell/indexer.php
shell/log.php
+sitemap.xml
skin/adminhtml/default/default/
skin/adminhtml/default/enterprise
skin/frontend/base/
Rafael Corrêa Gomes