diff --git a/.idea/nulib-spout.iml b/.idea/nulib-spout.iml
index a705279..461be9e 100644
--- a/.idea/nulib-spout.iml
+++ b/.idea/nulib-spout.iml
@@ -2,11 +2,9 @@
 <module type="WEB_MODULE" version="4">
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" packagePrefix="nulib\ext\" />
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" packagePrefix="nulib\" />
       <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" packagePrefix="nulib\ext\" />
       <sourceFolder url="file://$MODULE_DIR$/upstream-3.x/src" isTestSource="false" packagePrefix="OpenSpout\" />
-      <sourceFolder url="file://$MODULE_DIR$/upstream-4.x/benchmarks" isTestSource="true" packagePrefix="OpenSpout\Benchmarks\" />
-      <sourceFolder url="file://$MODULE_DIR$/upstream-4.x/src" isTestSource="false" packagePrefix="OpenSpout\" />
       <excludeFolder url="file://$MODULE_DIR$/vendor" />
     </content>
     <orderEntry type="inheritedJdk" />
diff --git a/composer.json b/composer.json
index f9a7c8e..88176ad 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
 	},
 	"autoload": {
 		"psr-4": {
-			"nulib\\ext\\": "src",
+			"nulib\\": "src",
 			"OpenSpout\\": "upstream-3.x/src"
 		}
 	},
diff --git a/composer.lock b/composer.lock
index 87717fe..20b1e35 100644
--- a/composer.lock
+++ b/composer.lock
@@ -12,7 +12,7 @@
             "dist": {
                 "type": "path",
                 "url": "../nulib",
-                "reference": "876873d8fc537901bf8a0f4f1d679f93d0fbc0c9"
+                "reference": "0dfb30d395c0516ba14ef3d9eb22e408bfd93d80"
             },
             "require": {
                 "ext-json": "*",
@@ -72,12 +72,12 @@
             },
             "type": "library",
             "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
                 "branch-alias": {
                     "dev-main": "2.5-dev"
-                },
-                "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
                 }
             },
             "autoload": {
@@ -146,8 +146,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -367,13 +367,13 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "3.x-dev"
-                },
                 "phpstan": {
                     "includes": [
                         "extension.neon"
                     ]
+                },
+                "branch-alias": {
+                    "dev-main": "3.x-dev"
                 }
             },
             "autoload": {
@@ -746,16 +746,16 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v3.65.0",
+            "version": "v3.68.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer.git",
-                "reference": "79d4f3e77b250a7d8043d76c6af8f0695e8a469f"
+                "reference": "b9db2b2ea3cdba7201067acee46f984ef2397cff"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/79d4f3e77b250a7d8043d76c6af8f0695e8a469f",
-                "reference": "79d4f3e77b250a7d8043d76c6af8f0695e8a469f",
+                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/b9db2b2ea3cdba7201067acee46f984ef2397cff",
+                "reference": "b9db2b2ea3cdba7201067acee46f984ef2397cff",
                 "shasum": ""
             },
             "require": {
@@ -772,17 +772,17 @@
                 "react/promise": "^2.0 || ^3.0",
                 "react/socket": "^1.0",
                 "react/stream": "^1.0",
-                "sebastian/diff": "^4.0 || ^5.0 || ^6.0",
-                "symfony/console": "^5.4 || ^6.0 || ^7.0",
-                "symfony/event-dispatcher": "^5.4 || ^6.0 || ^7.0",
-                "symfony/filesystem": "^5.4 || ^6.0 || ^7.0",
-                "symfony/finder": "^5.4 || ^6.0 || ^7.0",
-                "symfony/options-resolver": "^5.4 || ^6.0 || ^7.0",
-                "symfony/polyfill-mbstring": "^1.28",
-                "symfony/polyfill-php80": "^1.28",
-                "symfony/polyfill-php81": "^1.28",
-                "symfony/process": "^5.4 || ^6.0 || ^7.0",
-                "symfony/stopwatch": "^5.4 || ^6.0 || ^7.0"
+                "sebastian/diff": "^4.0 || ^5.1 || ^6.0",
+                "symfony/console": "^5.4 || ^6.4 || ^7.0",
+                "symfony/event-dispatcher": "^5.4 || ^6.4 || ^7.0",
+                "symfony/filesystem": "^5.4 || ^6.4 || ^7.0",
+                "symfony/finder": "^5.4 || ^6.4 || ^7.0",
+                "symfony/options-resolver": "^5.4 || ^6.4 || ^7.0",
+                "symfony/polyfill-mbstring": "^1.31",
+                "symfony/polyfill-php80": "^1.31",
+                "symfony/polyfill-php81": "^1.31",
+                "symfony/process": "^5.4 || ^6.4 || ^7.2",
+                "symfony/stopwatch": "^5.4 || ^6.4 || ^7.0"
             },
             "require-dev": {
                 "facile-it/paraunit": "^1.3.1 || ^2.4",
@@ -794,9 +794,9 @@
                 "php-cs-fixer/accessible-object": "^1.1",
                 "php-cs-fixer/phpunit-constraint-isidenticalstring": "^1.5",
                 "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.5",
-                "phpunit/phpunit": "^9.6.21 || ^10.5.38 || ^11.4.3",
-                "symfony/var-dumper": "^5.4.47 || ^6.4.15 || ^7.1.8",
-                "symfony/yaml": "^5.4.45 || ^6.4.13 || ^7.1.6"
+                "phpunit/phpunit": "^9.6.22 || ^10.5.40 || ^11.5.2",
+                "symfony/var-dumper": "^5.4.48 || ^6.4.15 || ^7.2.0",
+                "symfony/yaml": "^5.4.45 || ^6.4.13 || ^7.2.0"
             },
             "suggest": {
                 "ext-dom": "For handling output formats in XML",
@@ -837,7 +837,7 @@
             ],
             "support": {
                 "issues": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/issues",
-                "source": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/tree/v3.65.0"
+                "source": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/tree/v3.68.1"
             },
             "funding": [
                 {
@@ -845,7 +845,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-11-25T00:39:24+00:00"
+            "time": "2025-01-17T09:20:36+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -909,16 +909,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.3.1",
+            "version": "v5.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "8eea230464783aa9671db8eea6f8c6ac5285794b"
+                "reference": "447a020a1f875a434d62f2a401f53b82a396e494"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/8eea230464783aa9671db8eea6f8c6ac5285794b",
-                "reference": "8eea230464783aa9671db8eea6f8c6ac5285794b",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/447a020a1f875a434d62f2a401f53b82a396e494",
+                "reference": "447a020a1f875a434d62f2a401f53b82a396e494",
                 "shasum": ""
             },
             "require": {
@@ -961,9 +961,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.3.1"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.4.0"
             },
-            "time": "2024-10-08T18:51:32+00:00"
+            "time": "2024-12-30T11:07:19+00:00"
         },
         {
             "name": "nulib/tests",
@@ -1117,16 +1117,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.12.12",
+            "version": "1.12.16",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "b5ae1b88f471d3fd4ba1aa0046234b5ca3776dd0"
+                "reference": "e0bb5cb78545aae631220735aa706eac633a6be9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/b5ae1b88f471d3fd4ba1aa0046234b5ca3776dd0",
-                "reference": "b5ae1b88f471d3fd4ba1aa0046234b5ca3776dd0",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/e0bb5cb78545aae631220735aa706eac633a6be9",
+                "reference": "e0bb5cb78545aae631220735aa706eac633a6be9",
                 "shasum": ""
             },
             "require": {
@@ -1171,20 +1171,20 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-11-28T22:13:23+00:00"
+            "time": "2025-01-21T14:50:05+00:00"
         },
         {
             "name": "phpstan/phpstan-phpunit",
-            "version": "1.4.1",
+            "version": "1.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan-phpunit.git",
-                "reference": "11d4235fbc6313ecbf93708606edfd3222e44949"
+                "reference": "72a6721c9b64b3e4c9db55abbc38f790b318267e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/11d4235fbc6313ecbf93708606edfd3222e44949",
-                "reference": "11d4235fbc6313ecbf93708606edfd3222e44949",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/72a6721c9b64b3e4c9db55abbc38f790b318267e",
+                "reference": "72a6721c9b64b3e4c9db55abbc38f790b318267e",
                 "shasum": ""
             },
             "require": {
@@ -1221,9 +1221,9 @@
             "description": "PHPUnit extensions and rules for PHPStan",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
-                "source": "https://github.com/phpstan/phpstan-phpunit/tree/1.4.1"
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/1.4.2"
             },
-            "time": "2024-11-12T12:43:59+00:00"
+            "time": "2024-12-17T17:20:49+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -1546,16 +1546,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.6.21",
+            "version": "9.6.22",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "de6abf3b6f8dd955fac3caad3af7a9504e8c2ffa"
+                "reference": "f80235cb4d3caa59ae09be3adf1ded27521d1a9c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/de6abf3b6f8dd955fac3caad3af7a9504e8c2ffa",
-                "reference": "de6abf3b6f8dd955fac3caad3af7a9504e8c2ffa",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/f80235cb4d3caa59ae09be3adf1ded27521d1a9c",
+                "reference": "f80235cb4d3caa59ae09be3adf1ded27521d1a9c",
                 "shasum": ""
             },
             "require": {
@@ -1566,7 +1566,7 @@
                 "ext-mbstring": "*",
                 "ext-xml": "*",
                 "ext-xmlwriter": "*",
-                "myclabs/deep-copy": "^1.12.0",
+                "myclabs/deep-copy": "^1.12.1",
                 "phar-io/manifest": "^2.0.4",
                 "phar-io/version": "^3.2.1",
                 "php": ">=7.3",
@@ -1629,7 +1629,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.21"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.22"
             },
             "funding": [
                 {
@@ -1645,7 +1645,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-09-19T10:50:18+00:00"
+            "time": "2024-12-05T13:48:26+00:00"
         },
         {
             "name": "psr/container",
@@ -1869,33 +1869,33 @@
         },
         {
             "name": "react/child-process",
-            "version": "v0.6.5",
+            "version": "v0.6.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/reactphp/child-process.git",
-                "reference": "e71eb1aa55f057c7a4a0d08d06b0b0a484bead43"
+                "reference": "1721e2b93d89b745664353b9cfc8f155ba8a6159"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/child-process/zipball/e71eb1aa55f057c7a4a0d08d06b0b0a484bead43",
-                "reference": "e71eb1aa55f057c7a4a0d08d06b0b0a484bead43",
+                "url": "https://api.github.com/repos/reactphp/child-process/zipball/1721e2b93d89b745664353b9cfc8f155ba8a6159",
+                "reference": "1721e2b93d89b745664353b9cfc8f155ba8a6159",
                 "shasum": ""
             },
             "require": {
                 "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
                 "php": ">=5.3.0",
                 "react/event-loop": "^1.2",
-                "react/stream": "^1.2"
+                "react/stream": "^1.4"
             },
             "require-dev": {
-                "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.35",
-                "react/socket": "^1.8",
+                "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36",
+                "react/socket": "^1.16",
                 "sebastian/environment": "^5.0 || ^3.0 || ^2.0 || ^1.0"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "React\\ChildProcess\\": "src"
+                    "React\\ChildProcess\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -1932,19 +1932,15 @@
             ],
             "support": {
                 "issues": "https://github.com/reactphp/child-process/issues",
-                "source": "https://github.com/reactphp/child-process/tree/v0.6.5"
+                "source": "https://github.com/reactphp/child-process/tree/v0.6.6"
             },
             "funding": [
                 {
-                    "url": "https://github.com/WyriHaximus",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/clue",
-                    "type": "github"
+                    "url": "https://opencollective.com/reactphp",
+                    "type": "open_collective"
                 }
             ],
-            "time": "2022-09-16T13:41:56+00:00"
+            "time": "2025-01-01T16:37:48+00:00"
         },
         {
             "name": "react/dns",
@@ -3495,12 +3491,12 @@
             },
             "type": "library",
             "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
                 "branch-alias": {
                     "dev-main": "2.5-dev"
-                },
-                "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
                 }
             },
             "autoload": {
@@ -3773,8 +3769,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -3851,8 +3847,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -3935,8 +3931,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -4009,8 +4005,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -4085,8 +4081,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -4165,8 +4161,8 @@
             "type": "library",
             "extra": {
                 "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
                 }
             },
             "autoload": {
@@ -4310,12 +4306,12 @@
             },
             "type": "library",
             "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
                 "branch-alias": {
                     "dev-main": "2.5-dev"
-                },
-                "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
                 }
             },
             "autoload": {
diff --git a/src/spout/SpoutBuilder.php b/src/ext/spout/SpoutBuilder.php
similarity index 83%
rename from src/spout/SpoutBuilder.php
rename to src/ext/spout/SpoutBuilder.php
index 34258e3..863fa5f 100644
--- a/src/spout/SpoutBuilder.php
+++ b/src/ext/spout/SpoutBuilder.php
@@ -9,6 +9,9 @@ use nulib\php\func;
 use nulib\php\nur_func;
 use nulib\php\time\Date;
 use nulib\php\time\DateTime;
+use nulib\ref\ext\spout\ref_builder;
+use nulib\ref\ext\spout\ref_builder_ods;
+use nulib\ref\ext\spout\ref_builder_xlsx;
 use nulib\str;
 use nulib\web\http;
 use OpenSpout\Common\Entity\Cell;
@@ -38,7 +41,7 @@ class SpoutBuilder extends AbstractBuilder {
     if ($border === null) $border = new Border();
     $part = new BorderPart($name);
     if (($color = $params["color"] ?? null) !== null) {
-      $part->setColor(cl::get(ref_params::COLORS, $color, $color));
+      $part->setColor(cl::get(ref_builder::COLORS, $color, $color));
     }
     if (($width = $params["width"] ?? null) !== null) $part->setWidth($width);
     if (($style = $params["style"] ?? null) !== null) $part->setStyle($style);
@@ -67,10 +70,10 @@ class SpoutBuilder extends AbstractBuilder {
     if (($name = $font["name"] ?? null) !== null) $style->setFontName($name);
     if (($size = $font["size"] ?? null) !== null) $style->setFontSize($size);
     if (($color = $font["color"] ?? null) !== null) {
-      $style->setFontColor(cl::get(ref_params::COLORS, $color, $color));
+      $style->setFontColor(cl::get(ref_builder::COLORS, $color, $color));
     }
     if (($color = $cell["bg_color"] ?? null) !== null) {
-      $style->setBackgroundColor(cl::get(ref_params::COLORS, $color, $color));
+      $style->setBackgroundColor(cl::get(ref_builder::COLORS, $color, $color));
     }
     if (($align = $cell["align"] ?? null) !== null) $style->setCellAlignment($align);
     //if (($align = $params["valign"] ?? null) !== null) $style->setCellVerticalAlignment($align);
@@ -131,7 +134,7 @@ class SpoutBuilder extends AbstractBuilder {
   const TYPE_DATE = true;
 
   /** @var array configuration du writer */
-  const WRITER_PARAMS = null;
+  const SPOUT_PARAMS = null;
 
   /** @var array configuration de la première feuille */
   const SHEET_PARAMS = null;
@@ -144,48 +147,48 @@ class SpoutBuilder extends AbstractBuilder {
 
   function __construct(?string $output, ?array $params=null) {
     parent::__construct($output, $params);
-    $writerType = $params["ss_type"] ?? null;
-    if ($writerType === null) {
+    $ssType = $params["ss_type"] ?? null;
+    if ($ssType === null) {
       switch (path::ext($this->output)) {
       case ".ods":
-        $writerType = self::WRITER_TYPE_ODS;
+        $ssType = self::SS_TYPE_ODS;
         break;
       case ".xlsx":
       default:
-        $writerType = self::WRITER_TYPE_XLSX;
+        $ssType = self::SS_TYPE_XLSX;
         break;
       }
     }
 
-    $writerParams = $params["spout"] ?? static::WRITER_PARAMS;
-    $writerParams["default_column_width"] ??= 10.5;
-    self::ensure_style($writerParams["default_row_style"]);
-    switch ($writerType) {
+    $spoutParams = $params["spout"] ?? static::SPOUT_PARAMS;
+    $spoutParams["default_column_width"] ??= 10.5;
+    self::ensure_style($spoutParams["default_row_style"]);
+    switch ($ssType) {
     case "ods":
-    case self::WRITER_TYPE_ODS:
-      $writerType = self::WRITER_TYPE_ODS;
-      $writer = WriterEntityFactory::createODSWriter();
-      self::apply_params($writer, $writerParams, ref_params_ods::WRITER);
+    case self::SS_TYPE_ODS:
+      $ssType = self::SS_TYPE_ODS;
+      $ssWriter = WriterEntityFactory::createODSWriter();
+      self::apply_params($ssWriter, $spoutParams, ref_builder_ods::PARAMS_SPOUT);
       break;
     case "xlsx":
-    case self::WRITER_TYPE_XLSX:
+    case self::SS_TYPE_XLSX:
     default:
-      $writerType = self::WRITER_TYPE_XLSX;
-      $writer = WriterEntityFactory::createXLSXWriter();
-      self::apply_params($writer, $writerParams, ref_params_xlsx::WRITER);
+      $ssType = self::SS_TYPE_XLSX;
+      $ssWriter = WriterEntityFactory::createXLSXWriter();
+      self::apply_params($ssWriter, $spoutParams, ref_builder_xlsx::PARAMS_SPOUT);
       break;
     }
-    $defaultColumnWidth = $writerParams["default_column_width"] ?? null;
-    if ($defaultColumnWidth !== null) $writer->setDefaultColumnWidth($defaultColumnWidth);
-    $defaultRowHeight = $writerParams["default_row_height"] ?? null;
-    if ($defaultRowHeight !== null) $writer->setDefaultRowHeight($defaultRowHeight);
-    $defaultRowStyle = $writerParams["default_row_style"] ?? null;
-    if ($defaultRowStyle !== null) $writer->setDefaultRowStyle($defaultRowStyle);
-    $writer->writeToStream($this->getResource());
+    $defaultColumnWidth = $spoutParams["default_column_width"] ?? null;
+    if ($defaultColumnWidth !== null) $ssWriter->setDefaultColumnWidth($defaultColumnWidth);
+    $defaultRowHeight = $spoutParams["default_row_height"] ?? null;
+    if ($defaultRowHeight !== null) $ssWriter->setDefaultRowHeight($defaultRowHeight);
+    $defaultRowStyle = $spoutParams["default_row_style"] ?? null;
+    if ($defaultRowStyle !== null) $ssWriter->setDefaultRowStyle($defaultRowStyle);
+    $ssWriter->writeToStream($this->getResource());
 
-    $this->writerType = $writerType;
-    $this->writer = $writer;
-    $this->writerParams = $writerParams;
+    $this->ssType = $ssType;
+    $this->ssWriter = $ssWriter;
+    $this->writerParams = $spoutParams;
     $this->typeNumeric = boolval($params["type_numeric"] ?? static::TYPE_NUMERIC);
     $this->typeDate = boolval($params["type_date"] ?? static::TYPE_DATE);
 
@@ -199,12 +202,12 @@ class SpoutBuilder extends AbstractBuilder {
     $this->setSheet(null, $sheetParams);
   }
 
-  const WRITER_TYPE_ODS = 1, WRITER_TYPE_XLSX = 2;
+  const SS_TYPE_ODS = 1, SS_TYPE_XLSX = 2;
 
   /** @var int type de fichier généré */
-  protected int $writerType;
+  protected int $ssType;
 
-  protected WriterMultiSheetsAbstract $writer;
+  protected WriterMultiSheetsAbstract $ssWriter;
 
   protected ?array $writerParams;
 
@@ -248,7 +251,7 @@ class SpoutBuilder extends AbstractBuilder {
   function setSheet($sheetName, ?array $sheetParams=null): self {
     if ($sheetName !== null) $sheetParams["->setName"] = $sheetName;
 
-    $writer = $this->writer;
+    $writer = $this->ssWriter;
     if ($this->firstSheet) {
       $this->firstSheet = false;
       $sheet = $writer->getCurrentSheet();
@@ -259,18 +262,18 @@ class SpoutBuilder extends AbstractBuilder {
     }
     $this->rowStyle = self::STYLE_ROW;
 
-    switch ($this->writerType) {
-    case self::WRITER_TYPE_ODS:
+    switch ($this->ssType) {
+    case self::SS_TYPE_ODS:
       # appliquer les paramètres de la feuille
-      $this->apply_params($sheet, $sheetParams, ref_params_ods::SHEET);
+      $this->apply_params($sheet, $sheetParams, ref_builder_ods::PARAMS_SHEET);
       break;
-    case self::WRITER_TYPE_XLSX:
+    case self::SS_TYPE_XLSX:
       # appliquer les paramètres de la feuille
-      $this->apply_params($sheet, $sheetParams, ref_params_xlsx::SHEET);
+      $this->apply_params($sheet, $sheetParams, ref_builder_xlsx::PARAMS_SHEET);
       # appliquer les paramètres de la vue de la feuille
       $sheetViewParams =& $sheetParams["view"];
       $sheetViewParams["->setFreezeRow"] ??= 2;
-      $sheet->setSheetView(self::apply_params(new SheetView(), $sheetViewParams, ref_params_xlsx::SHEET_VIEW));
+      $sheet->setSheetView(self::apply_params(new SheetView(), $sheetViewParams, ref_builder_xlsx::PARAMS_SHEET_VIEW));
       break;
     }
     self::set_defaults($sheetParams, "header_style", [
@@ -350,7 +353,7 @@ class SpoutBuilder extends AbstractBuilder {
   function _write(array $row, ?array $colStyles=null, ?array $rowStyle=null): void {
     $rowParams = null;
     if ($rowStyle !== null) {
-      foreach (array_keys(ref_params::ROW) as $method) {
+      foreach (array_keys(ref_builder::ROW) as $method) {
         $value = $rowStyle[$method] ?? null;
         unset($rowStyle[$method]);
         if ($value !== null) $rowParams[$method] = $value;
@@ -389,8 +392,8 @@ class SpoutBuilder extends AbstractBuilder {
     $rowStyle ??= $oddStyle;
     self::ensure_style($rowStyle);
     $row = WriterEntityFactory::createRow($cells, $rowStyle);
-    self::apply_params($row, $rowParams, ref_params::ROW);
-    $this->writer->addRow($row);
+    self::apply_params($row, $rowParams, ref_builder::ROW);
+    $this->ssWriter->addRow($row);
     if ($differentOddEven) $this->oddEvenIndex++;
   }
 
@@ -414,7 +417,7 @@ class SpoutBuilder extends AbstractBuilder {
   }
 
   protected function _checkOk(): bool {
-    $this->writer->close();
+    $this->ssWriter->close();
     $this->rewind();
     return true;
   }
diff --git a/src/spout/SpoutReader.php b/src/ext/spout/SpoutReader.php
similarity index 100%
rename from src/spout/SpoutReader.php
rename to src/ext/spout/SpoutReader.php
diff --git a/src/tab/SsBuilder.php b/src/ext/tab/SsBuilder.php
similarity index 100%
rename from src/tab/SsBuilder.php
rename to src/ext/tab/SsBuilder.php
diff --git a/src/tab/SsReader.php b/src/ext/tab/SsReader.php
similarity index 100%
rename from src/tab/SsReader.php
rename to src/ext/tab/SsReader.php
diff --git a/src/spout/ref_params.php b/src/ref/ext/spout/ref_builder.php
similarity index 71%
rename from src/spout/ref_params.php
rename to src/ref/ext/spout/ref_builder.php
index 89e3a2f..8d01752 100644
--- a/src/spout/ref_params.php
+++ b/src/ref/ext/spout/ref_builder.php
@@ -1,13 +1,31 @@
 <?php
-namespace nulib\ext\spout;
+namespace nulib\ref\ext\spout;
 
 use OpenSpout\Common\Entity\Style\Color;
 
-class ref_params {
-  const READER = [
+class ref_builder {
+  const PARAMS = [
+    # Builder
+    "output" => "?string",
+    "schema" => "?array",
+    "headers" => "?array",
+    "use_headers" => "bool",
+    "rows" => "?array",
+    "cook_func" => "?callable",
+    "ss_type" => "?string",
+    # SpoutBuilder
+    "type_numeric" => "bool",
+    "type_date" => "bool",
+    "spout" => self::PARAMS_SPOUT,
+    "sheet" => self::PARAMS_SHEET,
+    "sheet_name" => "?string",
+    "sheet_view" => self::PARAMS_SHEET_VIEW,
+    # TempStream
+    "max_memory" => "?int",
+    "throw_on_error" => "?bool",
   ];
 
-  const WRITER = [
+  const PARAMS_SPOUT = [
     "->setColumnWidth" => ["float", ["int", null]],
     "->setColumnWidthForRange" => ["int", "int", "int"],
     "default_column_width" => "float",
@@ -15,7 +33,8 @@ class ref_params {
     "default_row_style" => self::STYLE,
   ];
 
-  const SHEET = [
+  const PARAMS_SHEET = [
+    "view" => self::PARAMS_SHEET_VIEW,
     "->setName" => ["string"],
     "->setIsVisible" => ["bool"],
     "header_style" => self::STYLE,
@@ -24,6 +43,8 @@ class ref_params {
     "different_odd_even" => "bool",
   ];
 
+  const PARAMS_SHEET_VIEW = [];
+
   const ROW = [
     "->setHeight" => ["float"],
   ];
diff --git a/src/ref/ext/spout/ref_builder_ods.php b/src/ref/ext/spout/ref_builder_ods.php
new file mode 100644
index 0000000..2c73661
--- /dev/null
+++ b/src/ref/ext/spout/ref_builder_ods.php
@@ -0,0 +1,5 @@
+<?php
+namespace nulib\ref\ext\spout;
+
+class ref_builder_ods extends ref_builder {
+}
diff --git a/src/spout/ref_params_xlsx.php b/src/ref/ext/spout/ref_builder_xlsx.php
similarity index 80%
rename from src/spout/ref_params_xlsx.php
rename to src/ref/ext/spout/ref_builder_xlsx.php
index cec45b4..60bd011 100644
--- a/src/spout/ref_params_xlsx.php
+++ b/src/ref/ext/spout/ref_builder_xlsx.php
@@ -1,9 +1,9 @@
 <?php
-namespace nulib\ext\spout;
+namespace nulib\ref\ext\spout;
 
-class ref_params_xlsx extends ref_params {
-  const SHEET = [
-    "view" => self::SHEET_VIEW,
+class ref_builder_xlsx extends ref_builder {
+  const PARAMS_SHEET = [
+    "view" => self::PARAMS_SHEET_VIEW,
     # copie de parent::SHEET
     "->setName" => ["string"],
     "->setIsVisible" => ["bool"],
@@ -13,7 +13,7 @@ class ref_params_xlsx extends ref_params {
     "different_odd_even" => "bool",
   ];
 
-  const SHEET_VIEW = [
+  const PARAMS_SHEET_VIEW = [
     "->setFreezeRow" => ["int"],
     "->setFreezeColumn" => ["string"],
     "->setZoomScale" => ["int"],
@@ -31,5 +31,6 @@ class ref_params_xlsx extends ref_params {
     "->setZoomScaleNormal" => ["int"],
     "->setZoomScalePageLayoutView" => ["int"],
     "->setWorkbookViewId" => ["int"],
+    # copie de parent::PARAMS_SHEET_VIEW
   ];
 }
diff --git a/src/spout/ref_params_ods.php b/src/spout/ref_params_ods.php
deleted file mode 100644
index b0068e9..0000000
--- a/src/spout/ref_params_ods.php
+++ /dev/null
@@ -1,5 +0,0 @@
-<?php
-namespace nulib\ext\spout;
-
-class ref_params_ods extends ref_params {
-}