How can I present different types in my sitemap.

Standard it only present the rootlevel type Page. What if, for example, there is a articlePage and a Page type?

function SiteMap() {
$rootLevel = DataObject::get("Page", "ParentID = 0"); // Pages at the root level only
$output = "";
$output = $this->makeList($rootLevel);
return $output;
}

I forgot to mention, on the first Page.php the make list function can be further edited to make the page levels too, with adding sub lists, and so on.

Problem solved. Sitemap works fine.   

function SiteMap()
{
$output = "";

$rootLevel = DataObject::get("SiteTree", "ParentID = 0");
$output = $this->makeList($rootLevel);

return $output;
}