protected function get_iri() {
		if (!$this->is_valid()) {
			return false;
		}

		$iri = '';
		if ($this->scheme !== null) {
			$iri .= $this->scheme . ':';
		}
		if (($iauthority = $this->get_iauthority()) !== null) {
			$iri .= '//' . $iauthority;
		}
		$iri .= $this->ipath;
		if ($this->iquery !== null) {
			$iri .= '?' . $this->iquery;
		}
		if ($this->ifragment !== null) {
			$iri .= '#' . $this->ifragment;
		}

		return $iri;
	}