root->add_child("Name")->add_child_text ("hello there world");
root->add_child("Id")->add_child_text ("4");
root->add_child("FrameRate")->add_child_text ("44100");
root->add_child("Name")->add_child_text ("hello there world");
root->add_child("Id")->add_child_text ("4");
root->add_child("FrameRate")->add_child_text ("44100");