Hi, is there a way to exclude a page-class from the sitemap.xml with a line of php code? I know this can be done by hand, but I want a certain page type to not show up at all, without user interference.

Got it:

Templates and pages who do not show up in search (even when search is not implemented on the site) do also not show up in the sitemap.xml. To make this the standard you could add the folowing code to your classes:

static $defaults = array(
		"ShowInSearch" => 0
	);

And you could add this to your getCMSFields()

$fields->removeFieldFromTab("Root.Behaviour","ShowInSearch");

Or if you want the page to stay in search but be removed from sitemap then:

	protected function onBeforeWrite() {
		$this->Priority = '-1';
		parent::onBeforeWrite();
	}