public function getSeriesId(): \Psr\Http\Message\UriInterface
    {
        if (!$this->seriesId) {
            return new Uri();
        }

        return $this->seriesId;
    }
public function getSeriesId(): \Psr\Http\Message\UriInterface
    {
        if (!$this->seriesId) {
            return new Uri();
        }

        return $this->seriesId;
    }
public function getSeriesId ( ) : \ Psr \ Http \ Message \ UriInterface { if ( ! $ this -> seriesId ) { return new Uri ( ) ; } return $ this -> seriesId ; }
Returns the ID of the Program that represents the series to which this media belongs. The GUID URI is recommended.

@return \Psr\Http\Message\UriInterface
Returns the ID of the Program that represents the series to which this media belongs . The GUID URI is recommended .