public function greaterThan( $other )
	{
		return $this->namespaceURI && $other->namespaceURI == null ||
		$this->namespaceURI && $other->namespaceURI && $this->namespaceURI > $other->namespaceURI ||
		$this->namespaceURI == $other->namespaceURI && $this->localName > $other->localName;
	}