[qualiteam]

Moving to "Program Logic" forum.

There is no tutorial unfortunately. But you can always check the source code of any built-in module to get the idea.

I suppose the sitemap module can be used as a source:

grep -r "\/Sitemap\/" *

Also, check this -> http://help.qtmsoft.com/index.php?title=X-Cart:Integration_with_third_party_modules