/**
     * SID type for a non-use SID.
     */
    public static final int SID_TYPE_USE_NONE = 0;

    /**
     * SID type for a user.
     */
    public static final int SID_TYPE_USER = 1;

    /**
     * SID type for a well-known group.
     */
    public static final int SID_TYPE_WKN_GRP = 5;

    /**
     * The Fess configuration.
     */
    protected FessConfig fessConfig;