constructor(workbook, idNode, node, relationshipsNode) {
        this._init(workbook, idNode, node, relationshipsNode);
    }
//  * Creates a new instance of Sheet.
    //  * @param {Workbook} workbook - The parent workbook.
    //  * @param {{}} idNode - The sheet ID node (from the parent workbook).
    //  * @param {{}} node - The sheet node.
    //  * @param {{}} [relationshipsNode] - The optional sheet relationships node.
    //