Category

17class Category18{19    /**20     * Category identifier21     *22     * @var string|null23     * @see get_term24     */25    public $term;26 27    /**28     * Categorization scheme identifier29     *30     * @var string|null31     * @see get_scheme()32     */33    public $scheme;34 35    /**36     * Human readable label37     *38     * @var string|null39     * @see get_label()40     */41    public $label;42 43    /**44     * Category type45     *46     * category for <category>47     * subject for <dc:subject>48     *49     * @var string|null50     * @see get_type()51     */52    public $type;53 54    /**55     * Constructor, used to input the data56     *57     * @param string|null $term58     * @param string|null $scheme59     * @param string|null $label60     * @param string|null $type61     */62    public function __construct(?string $term = null, ?string $scheme = null, ?string $label = null, ?string $type = null)63    {64        $this->term = $term;65        $this->scheme = $scheme;66        $this->label = $label;67        $this->type = $type;68    }69 70    /**71     * String-ified version72     *73     * @return string74     */75    public function __toString()76    {77        // There is no $this->data here78        return md5(serialize($this));79    }80 81    /**82     * Get the category identifier83     *84     * @return string|null85     */86    public function get_term()87    {88        return $this->term;89    }90 91    /**92     * Get the categorization scheme identifier93     *94     * @return string|null95     */96    public function get_scheme()