diff --git a/src/spout/SpoutBuilder.php b/src/spout/SpoutBuilder.php
index 4d64bba..c09c582 100644
--- a/src/spout/SpoutBuilder.php
+++ b/src/spout/SpoutBuilder.php
@@ -1,7 +1,6 @@
 <?php
 namespace nulib\ext\spout;
 
-use DateTimeInterface;
 use nulib\cl;
 use nulib\file\tab\AbstractBuilder;
 use nulib\file\tab\TAbstractBuilder;
@@ -24,36 +23,6 @@ use OpenSpout\Writer\XLSX\Entity\SheetView;
 class SpoutBuilder extends AbstractBuilder {
   use TAbstractBuilder;
 
-  const DATE_FORMAT = "dd/mm/yyyy";
-
-  const DATETIME_FORMAT = "dd/mm/yyyy hh:mm:ss";
-
-  /** @var bool faut-il choisir le type numérique pour une chaine numérique? */
-  const TYPE_NUMERIC = true;
-
-  /** @var bool faut-il choisir le type date pour une chaine au bon format? */
-  const TYPE_DATE = true;
-
-  /** @var array configuration du writer */
-  const WRITER_PARAMS = null;
-
-  /** @var array options du writer */
-  const WRITER_OPTIONS_PARAMS = null;
-
-  /** @var array configuration de la première feuille */
-  const SHEET_PARAMS = null;
-
-  /** @var array configuration de la vue de la première feuille */
-  const SHEET_VIEW_PARAMS = null;
-
-  /**
-   * @var string|int|null nom de la feuille dans laquelle écrire.
-   *
-   * spécifier cette valeur est équivalent à spécifier la clé "->setName" de
-   * SHEET_PARAMS
-   */
-  const WSNAME = null;
-
   protected static function apply_params($object, ?array $params, array $refParams) {
     foreach (array_keys($refParams) as $method) {
       if (!str::starts_with("->", $method)) continue;
@@ -151,54 +120,89 @@ class SpoutBuilder extends AbstractBuilder {
     return $style;
   }
 
+  const DATE_FORMAT = "dd/mm/yyyy";
+
+  const DATETIME_FORMAT = "dd/mm/yyyy hh:mm:ss";
+
+  /** @var bool faut-il choisir le type numérique pour une chaine numérique? */
+  const TYPE_NUMERIC = true;
+
+  /** @var bool faut-il choisir le type date pour une chaine au bon format? */
+  const TYPE_DATE = true;
+
+  /** @var array configuration du writer */
+  const WRITER_PARAMS = null;
+
+  /** @var array configuration de la première feuille */
+  const SHEET_PARAMS = null;
+
+  /** @var string nom de la première feuille */
+  const SHEET_NAME = null;
+
+  /** @var array configuration de la vue de la première feuille */
+  const SHEET_VIEW_PARAMS = null;
+
   function __construct(?string $output, ?array $params=null) {
     parent::__construct($output, $params);
-    $ssType = $params["ss_type"] ?? null;
-    if ($ssType === null) {
+    $writerType = $params["ss_type"] ?? null;
+    if ($writerType === null) {
       switch (path::ext($this->output)) {
       case ".ods":
-        $ssType = self::SS_TYPE_ODS;
+        $writerType = self::WRITER_TYPE_ODS;
         break;
       case ".xlsx":
       default:
-        $ssType = self::SS_TYPE_XLSX;
+        $writerType = self::WRITER_TYPE_XLSX;
         break;
       }
     }
-    switch ($ssType) {
+
+    $writerParams = $params["spout"] ?? static::WRITER_PARAMS;
+    $writerParams["->setDefaultColumnWidth"] ??= 10.5;
+    switch ($writerType) {
     case "ods":
-    case self::SS_TYPE_ODS:
-      $ss = WriterEntityFactory::createODSWriter();
-      $ssType = self::SS_TYPE_ODS;
+    case self::WRITER_TYPE_ODS:
+      $writerType = self::WRITER_TYPE_ODS;
+      $writer = WriterEntityFactory::createODSWriter();
+      self::apply_params($writer, $writerParams, ref_params_ods::WRITER);
       break;
     case "xlsx":
-    case self::SS_TYPE_XLSX:
+    case self::WRITER_TYPE_XLSX:
     default:
-      $ss = WriterEntityFactory::createXLSXWriter();
-      $ssType = self::SS_TYPE_XLSX;
+      $writerType = self::WRITER_TYPE_XLSX;
+      $writer = WriterEntityFactory::createXLSXWriter();
+      self::apply_params($writer, $writerParams, ref_params_xlsx::WRITER);
       break;
     }
-    $ss->setDefaultColumnWidth(10.5);
-    $ss->writeToStream($this->getResource());
-    $this->ssType = $ssType;
-    $this->ss = $ss;
+    self::ensure_style($writerParams["default_row_style"]);
+    $defaultRowStyle = $writerParams["default_row_style"];
+    if ($defaultRowStyle !== null) $writer->setDefaultRowStyle($defaultRowStyle);
+    $writer->writeToStream($this->getResource());
+
+    $this->writerType = $writerType;
+    $this->writer = $writer;
+    $this->writerParams = $writerParams;
     $this->typeNumeric = boolval($params["type_numeric"] ?? static::TYPE_NUMERIC);
     $this->typeDate = boolval($params["type_date"] ?? static::TYPE_DATE);
-    $this->firstSheet = true;
 
     $sheetParams = $params["sheet"] ?? static::SHEET_PARAMS;
+    $sheetName = $params["sheet_name"] ?? static::SHEET_NAME;
+    if ($sheetParams !== null) $sheetParams["name"] = $sheetName;
     $sheetViewParams = $params["sheet_view"] ?? static::SHEET_VIEW_PARAMS;
     if ($sheetViewParams !== null) $sheetParams["view"] = $sheetViewParams;
+    $this->firstSheet = true;
     $this->sheetParams = null;
-    $this->setSheet($params["wsname"] ?? static::WSNAME, $sheetParams);
+    $this->setSheet(null, $sheetParams);
   }
 
-  const SS_TYPE_ODS = 1, SS_TYPE_XLSX = 2;
+  const WRITER_TYPE_ODS = 1, WRITER_TYPE_XLSX = 2;
 
   /** @var int type de fichier généré */
-  protected int $ssType;
+  protected int $writerType;
 
-  protected WriterMultiSheetsAbstract $ss;
+  protected WriterMultiSheetsAbstract $writer;
+
+  protected ?array $writerParams;
 
   protected bool $typeNumeric;
 
@@ -240,42 +244,41 @@ class SpoutBuilder extends AbstractBuilder {
   function setSheet($sheetName, ?array $sheetParams=null): self {
     if ($sheetName !== null) $sheetParams["->setName"] = $sheetName;
 
-    $ss = $this->ss;
+    $writer = $this->writer;
     if ($this->firstSheet) {
       $this->firstSheet = false;
-      $ws = $ss->getCurrentSheet();
+      $sheet = $writer->getCurrentSheet();
     } else {
-      $ws = $ss->addNewSheetAndMakeItCurrent();
+      $sheet = $writer->addNewSheetAndMakeItCurrent();
       $this->wroteHeaders = false;
       $this->built = false;
     }
     $this->rowStyle = self::STYLE_ROW;
 
-    switch ($this->ssType) {
-    case self::SS_TYPE_ODS:
+    switch ($this->writerType) {
+    case self::WRITER_TYPE_ODS:
       # appliquer les paramètres de la feuille
-      $this->apply_params($ss, $sheetParams, ref_params_ods::SHEET);
+      $this->apply_params($sheet, $sheetParams, ref_params_ods::SHEET);
       break;
-    case self::SS_TYPE_XLSX:
+    case self::WRITER_TYPE_XLSX:
       # appliquer les paramètres de la feuille
-      $this->apply_params($ss, $sheetParams, ref_params_xlsx::SHEET);
-      $this->ensure_style($sheetParams["default_style"]);
-      $this->ensure_style($sheetParams["header_style"]);
-      $this->ensure_style($sheetParams["odd_style"]);
-      $this->ensure_style($sheetParams["even_style"]);
-      self::set_defaults($sheetParams, "header_style", [
-        "font" => ["bold" => true],
-        "bg_color" => "gray",
-      ]);
-      self::set_defaults($sheetParams, "even_style", [
-        "bg_color" => "light_gray",
-      ]);
+      $this->apply_params($sheet, $sheetParams, ref_params_xlsx::SHEET);
       # appliquer les paramètres de la vue de la feuille
       $sheetViewParams =& $sheetParams["view"];
       $sheetViewParams["->setFreezeRow"] ??= 2;
-      $ws->setSheetView($this->apply_params(new SheetView(), $sheetViewParams, ref_params_xlsx::SHEET_VIEW));
+      $sheet->setSheetView(self::apply_params(new SheetView(), $sheetViewParams, ref_params_xlsx::SHEET_VIEW));
       break;
     }
+    self::set_defaults($sheetParams, "header_style", [
+      "font" => ["bold" => true],
+      "bg_color" => "gray",
+    ]);
+    self::set_defaults($sheetParams, "even_style", [
+      "bg_color" => "light_gray",
+    ]);
+    $this->ensure_style($sheetParams["header_style"]);
+    $this->ensure_style($sheetParams["odd_style"]);
+    $this->ensure_style($sheetParams["even_style"]);
     $this->sheetParams = $sheetParams;
 
     if ($sheetParams !== null) {
@@ -372,7 +375,7 @@ class SpoutBuilder extends AbstractBuilder {
     }
     $rowStyle ??= $oddStyle;
     self::ensure_style($rowStyle);
-    $this->ss->addRow(WriterEntityFactory::createRow($cells, $rowStyle));
+    $this->writer->addRow(WriterEntityFactory::createRow($cells, $rowStyle));
     if ($differentOddEven) $this->oddEvenIndex++;
   }
 
@@ -396,7 +399,7 @@ class SpoutBuilder extends AbstractBuilder {
   }
 
   protected function _checkOk(): bool {
-    $this->ss->close();
+    $this->writer->close();
     $this->rewind();
     return true;
   }
diff --git a/src/spout/ref_params_ods.php b/src/spout/ref_params_ods.php
index d572683..87c382e 100644
--- a/src/spout/ref_params_ods.php
+++ b/src/spout/ref_params_ods.php
@@ -3,20 +3,19 @@ namespace nulib\ext\spout;
 
 class ref_params_ods extends ref_params {
   const READER = [
-    "options" => self::READER_OPTIONS,
   ];
 
-  const READER_OPTIONS = [];
-
   const WRITER = [
-    "options" => self::WRITER_OPTIONS,
-    "default_style" => self::STYLE,
+    "->setDefaultColumnWidth" => ["float"],
+    "->setDefaultRowHeight" => ["float"],
+    "->setColumnWidth" => ["float", ["int", null]],
+    "->setColumnWidthForRange" => ["int", "int", "int"],
+    "default_row_style" => self::STYLE,
   ];
 
-  const WRITER_OPTIONS = [];
-
   const SHEET = [
     "->setName" => ["string"],
+    "-setIsVisible" => ["bool"],
     "header_style" => self::STYLE,
     "odd_style" => self::STYLE,
     "even_style" => self::STYLE,
diff --git a/src/spout/ref_params_xlsx.php b/src/spout/ref_params_xlsx.php
index d78cbec..c9d0c85 100644
--- a/src/spout/ref_params_xlsx.php
+++ b/src/spout/ref_params_xlsx.php
@@ -3,52 +3,19 @@ namespace nulib\ext\spout;
 
 class ref_params_xlsx extends ref_params {
   const READER = [
-    "options" => self::READER_OPTIONS,
-  ];
-
-  const READER_OPTIONS = [
-    "SHOULD_FORMAT_DATES" => "bool",
-    "SHOULD_PRESERVE_EMPTY_ROWS" => "bool",
   ];
 
   const WRITER = [
-    "->setCreator" => ["string"],
-    "->setColumnWidth" => ["int", "int"],
+    "->setDefaultColumnWidth" => ["float"],
+    "->setDefaultRowHeight" => ["float"],
+    "->setColumnWidth" => ["float", ["int", null]],
     "->setColumnWidthForRange" => ["int", "int", "int"],
-    "options" => self::WRITER_OPTIONS,
-    "default_style" => self::STYLE,
-  ];
-
-  const WRITER_OPTIONS = [
-    "SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY " => "bool",
-    "SHOULD_USE_INLINE_STRINGS" => "bool",
-    "->setPageSetup" => [
-      "page_orientation" => "string",
-      "page_size" => "string",
-      "fit_to_height" => "bool",
-      "fit_to_width" => "bool",
-    ],
-    "->setPageMargin" => [
-      "top" => "float",
-      "right" => "float",
-      "bottom" => "float",
-      "left" => "float",
-      "header" => "float",
-      "footer" => "float",
-    ],
-    "->setHeaderFooter" => [
-      "odd_header" => "string",
-      "odd_footer" => "string",
-      "even_header" => "string",
-      "even_footer" => "string",
-      "different_odd_even" => "bool",
-    ],
+    "default_row_style" => self::STYLE,
   ];
 
   const SHEET = [
     "->setName" => ["string"],
-    "->setColumnWidth" => ["int", "int"],
-    "->setColumnWidthForRange" => ["int", "int", "int"],
+    "-setIsVisible" => ["bool"],
     "view" => self::SHEET_VIEW,
     "header_style" => self::STYLE,
     "odd_style" => self::STYLE,