The following is a sample main function if you want to try this code. It may also help you to understand how to use it:
public static function main(): Void
{
trace('Hello World');
trace(Page.fromXMLFile("/Users/benjamin/example.xml"));
trace(Page.fromXMLFile("/Users/benjamin/example.xml"));
var p = new Page();
p.name = "Page de test";
var l1 = new Layer();
l1.id="l1";
var l2 = new Layer();
l2.id="l2";
p.layers.add(l1);
p.layers.add(l2);
p.toXMLFile("/Users/benjamin/page1.xml");
}