GapiSheetsV4Model.DataSourceObjectReferenceSourcetype t = {sheetId : string;References to a DATA_SOURCE sheet.
*)chartId : int;References to a data source chart.
*)dataSourceTableAnchorCell : GridCoordinate.t;References to a DataSourceTable anchored at the cell.
*)dataSourcePivotTableAnchorCell : GridCoordinate.t;References to a data source PivotTable anchored at the cell.
*)dataSourceFormulaCell : GridCoordinate.t;References to a cell containing DataSourceFormula.
*)}