PHPDaemon\XMLStream\XMLStreamObject::sub PHP Method

    public function sub($name, $attrs = null, $ns = null)
    {
        //@TODO: attrs is ignored
        foreach ($this->subs as $sub) {
            if ($sub->name === $name and ($ns === null or $sub->ns === $ns)) {
                return $sub;
            }
        }
        return null;
    }