admin_xml_ns action-hook . WP 2.2.0

Fires inside the HTML tag in the admin header.

Usage

add_action( 'admin_xml_ns', 'action_function_name_1899' );
function action_function_name_1899(){
	// action...
}

Where the hook is called

do_action( 'admin_xml_ns' );

do_action( 'admin_xml_ns' );

Where the hook is used (in WP core)