/**
     * Adds additional meta out of an array of properties.
     *
     * @param array $raw An array of properties
     */
    public function build_meta( $raw ) {

        $kind = get_post_kind_slug( $this->post );

        foreach($raw as $key=>$value)
        {
            if(is_null($value) || $value == '')
            unset($raw[$key]);
        }
        if ( isset( $raw['url'] ) ) {
            $body = self::fetch( $raw['url'] );
            $data = self::parse( $body );

            $data = array_merge($data, $raw  );

            $map = Kind_Taxonomy::get_kind_properties();
            if ( array_key_exists( $kind, $map ) ) {
                    $this->meta[ $map[ $kind ] ] = $data['url'];
                    unset( $data['url'] );
            }

            $this->meta['cite'] = array_filter( $data );

        }
    }