public function addSubtitle($value, $type = 'text')
    {
        /** @var Subtitle $element */
        $element = $this->addChild('atom:subtitle', 'subtitle');
        $element->setContent($value, $type);

        return $element;
    }
public function addSubtitle($value, $type = 'text')
    {
        /** @var Subtitle $element */
        $element = $this->addChild('atom:subtitle', 'subtitle');
        $element->setContent($value, $type);

        return $element;
    }
public function addSubtitle ( $ value , $ type = 'text' ) { /** @var Subtitle $element */ $ element = $ this -> addChild ( 'atom:subtitle' , 'subtitle' ) ; $ element -> setContent ( $ value , $ type ) ; return $ element ; }
Add subtitle.

@param string $value
@param string $type

@return Subtitle

@since 1.0
Add subtitle .