Texy\HtmlElement::validateChild PHP Method

    public function validateChild($child, $dtd)
    {
        if (isset($dtd[$this->name])) {
            if ($child instanceof self) {
                $child = $child->name;
            }
            return isset($dtd[$this->name][1][$child]);
        } else {
            return TRUE;
            // unknown element
        }
    }