gan_node_html.php
protected function filter_onlytype() {
		if ($this->parent === null) {
			return false;
		} else {
			return (count($this->parent->getChildrenByTag($this->tag, 'total', false)) === 1);
		}
	}
protected function filter_onlytype() {
		if ($this->parent === null) {
			return false;
		} else {
			return (count($this->parent->getChildrenByTag($this->tag, 'total', false)) === 1);
		}
	}
Checks if node matches css query filter ":only-of-type"
@return bool
@see match()
@access private