diff --git a/composer.json b/composer.json
index f462f87..b389049 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
         "ext-dom": "*",
         "goetas-webservices/xsd-reader": "^0.4.6",
-        "php-soap/engine": "^2.9",
+        "php-soap/engine": "^2.10.1",
         "php-soap/wsdl": "^1.4",
         "php-soap/xml": "^1.6.0",
         "veewee/xml": "^3.0",
diff --git a/src/Metadata/Converter/Wsdl1ToMethodsConverter.php b/src/Metadata/Converter/Wsdl1ToMethodsConverter.php
index aa5edc6..e7460b6 100644
--- a/src/Metadata/Converter/Wsdl1ToMethodsConverter.php
+++ b/src/Metadata/Converter/Wsdl1ToMethodsConverter.php
@@ -55,14 +55,13 @@ private function parseMethod(Wsdl1SelectedService $service, BindingOperation $bi
             []
         );
 
-        $void = XsdType::guess('void');
         $returnType = $outputMessage->map($convertMessageToTypesDict)->mapOr(
             static fn (array $types): XsdType => match (count($types)) {
-                0 => $void,
+                0 => XsdType::void(),
                 1 => first($types),
                 default => XsdType::guess('array')
             },
-            $void
+            XsdType::void()
         );
 
         $configure = pipe(
diff --git a/src/Metadata/Predicate/IsOfType.php b/src/Metadata/Predicate/IsOfType.php
new file mode 100644
index 0000000..970380a
--- /dev/null
+++ b/src/Metadata/Predicate/IsOfType.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+namespace Soap\WsdlReader\Metadata\Predicate;
+
+use Soap\Engine\Metadata\Model\XsdType;
+
+final class IsOfType
+{
+    /**
+     * @param non-empty-string $namespace
+     * @param non-empty-string $name
+     */
+    public function __construct(
+        private readonly string $namespace,
+        private readonly string $name
+    ) {
+    }
+
+    public function __invoke(XsdType $type): bool
+    {
+        $normalize = mb_strtolower(...);
+        $expectedName = $normalize($this->name);
+        $expectedNamespace = $normalize($this->namespace);
+
+        if ($normalize($type->getXmlTypeName()) === $expectedName && $normalize($type->getXmlNamespace()) === $expectedNamespace) {
+            return true;
+        }
+
+        $extends = $type->getMeta()
+            ->extends()
+            ->filter(static fn (array $extends): bool => $normalize($extends['type']) === $expectedName
+                && $normalize($extends['namespace']) === $expectedNamespace);
+        if ($extends->isSome()) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/tests/Unit/Metadata/Predicate/IsOfTypeTest.php b/tests/Unit/Metadata/Predicate/IsOfTypeTest.php
new file mode 100644
index 0000000..9566b09
--- /dev/null
+++ b/tests/Unit/Metadata/Predicate/IsOfTypeTest.php
@@ -0,0 +1,120 @@
+<?php
+declare(strict_types=1);
+
+namespace Soap\WsdlReader\Test\Unit\Metadata\Predicate;
+
+use PHPUnit\Framework\TestCase;
+use Soap\Engine\Metadata\Model\TypeMeta;
+use Soap\Engine\Metadata\Model\XsdType;
+use Soap\WsdlReader\Metadata\Predicate\IsOfType;
+
+final class IsOfTypeTest extends TestCase
+{
+
+    /**
+     * @dataProvider provideTests
+     *
+     */
+    public function test_it_knows_if_a_type_is_considered_nullable(
+        string $namespace,
+        string $name,
+        XsdType $type,
+        bool $expected
+    ): void {
+        static::assertSame($expected, (new IsOfType($namespace, $name))($type));
+    }
+
+    public static function provideTests()
+    {
+        yield 'empty' => [
+            'https://test',
+            'test',
+            (new XsdType('')),
+            false,
+        ];
+        yield 'invalid-type' => [
+            'https://test',
+            'test',
+            (new XsdType('test'))
+                ->withXmlTypeName('invalid')
+                ->withXmlNamespace('https://test'),
+            false,
+        ];
+        yield 'invalid-ns' => [
+            'https://test',
+            'test',
+            (new XsdType('test'))
+                ->withXmlTypeName('test')
+                ->withXmlNamespace('invalid'),
+            false,
+        ];
+        yield 'valid' => [
+            'https://test',
+            'test',
+            (new XsdType('test'))
+                ->withXmlTypeName('test')
+                ->withXmlNamespace('https://test'),
+            true,
+        ];
+        yield 'valid-case-insensitive' => [
+            'https://TEST',
+            'TEST',
+            (new XsdType('test'))
+                ->withXmlTypeName('test')
+                ->withXmlNamespace('https://test'),
+            true,
+        ];
+        yield 'invalid-extend-type' => [
+            'https://test',
+            'test',
+            (new XsdType(''))
+                ->withMeta(
+                    static fn (TypeMeta $meta) => $meta->withExtends([
+                        'type' => 'invalid',
+                        'namespace' => 'https://test',
+                        'isSimple' => false,
+                    ])
+                ),
+            false,
+        ];
+        yield 'invalid-extend-ns' => [
+            'https://test',
+            'test',
+            (new XsdType(''))
+                ->withMeta(
+                    static fn (TypeMeta $meta) => $meta->withExtends([
+                        'type' => 'test',
+                        'namespace' => 'invalid',
+                        'isSimple' => false,
+                    ])
+                ),
+            false,
+        ];
+        yield 'valid-extend' => [
+            'https://test',
+            'test',
+            (new XsdType(''))
+                ->withMeta(
+                    static fn (TypeMeta $meta) => $meta->withExtends([
+                        'type' => 'test',
+                        'namespace' => 'https://test',
+                        'isSimple' => false,
+                    ])
+                ),
+            true,
+        ];
+        yield 'valid-extend-case-insensitive' => [
+            'https://TEST',
+            'TEST',
+            (new XsdType(''))
+                ->withMeta(
+                    static fn (TypeMeta $meta) => $meta->withExtends([
+                        'type' => 'test',
+                        'namespace' => 'https://test',
+                        'isSimple' => false,
+                    ])
+                ),
+            true,
+        ];
+    }
+}