private function register() {

		$this->options['labels'] = $this->label;
		if (!isset($this->options['rewrite'])) {
			$this->options['rewrite'] = array('slug' => $this->singular);
		}

		$_self = &$this;

		add_action('init', function () use (&$_self) {
			register_taxonomy($_self->singular, $_self->post_types, $this->options);
		});

	}