diff --git a/src/Metadata/Converter/Types/Configurator/AttributeSingleConfigurator.php b/src/Metadata/Converter/Types/Configurator/AttributeSingleConfigurator.php
index 499acdf..cbd3472 100644
--- a/src/Metadata/Converter/Types/Configurator/AttributeSingleConfigurator.php
+++ b/src/Metadata/Converter/Types/Configurator/AttributeSingleConfigurator.php
@@ -3,6 +3,7 @@
 
 namespace Soap\WsdlReader\Metadata\Converter\Types\Configurator;
 
+use GoetasWebservices\XML\XSDReader\Schema\Attribute\AttributeRef;
 use GoetasWebservices\XML\XSDReader\Schema\Attribute\AttributeSingle;
 use Soap\Engine\Metadata\Model\TypeMeta;
 use Soap\Engine\Metadata\Model\XsdType as EngineType;
@@ -17,6 +18,10 @@ public function __invoke(EngineType $engineType, mixed $xsdType, TypesConverterC
             return $engineType;
         }
 
+        // A ref points to a global attribute declaration, which is always qualified with the target namespace
+        // of the schema that declares it. The form and attributeFormDefault rules only apply to local declarations.
+        $isQualified = $xsdType instanceof AttributeRef || $xsdType->isQualified();
+
         $configure = pipe(
             static fn (EngineType $engineType): EngineType => (new RestrictionsConfigurator())($engineType, $xsdType->getType()?->getRestriction(), $context),
         );
@@ -25,7 +30,7 @@ public function __invoke(EngineType $engineType, mixed $xsdType, TypesConverterC
             $engineType
                 ->withMeta(
                     static fn (TypeMeta $meta): TypeMeta => $meta
-                        ->withIsQualified($xsdType->isQualified())
+                        ->withIsQualified($isQualified)
                         ->withIsNil($xsdType->isNil())
                         ->withIsNullable($meta->isNullable()->unwrapOr(false) || $xsdType->isNil())
                         ->withUse($xsdType->getUse())
diff --git a/src/Parser/Definitions/NamespacesParser.php b/src/Parser/Definitions/NamespacesParser.php
index 443d2b2..05a05fc 100644
--- a/src/Parser/Definitions/NamespacesParser.php
+++ b/src/Parser/Definitions/NamespacesParser.php
@@ -6,6 +6,7 @@
 use Dom\NamespaceInfo;
 use Soap\WsdlReader\Model\Definitions\Namespaces;
 use VeeWee\Xml\Dom\Document;
+use VeeWee\Xml\Xmlns\Xmlns;
 use function Psl\Dict\merge;
 use function Psl\Iter\reduce;
 use function VeeWee\Xml\Dom\Locator\document_element;
@@ -27,7 +28,7 @@ public static function tryParse(Document $wsdl): Namespaces
                  */
                 static fn (array $map, NamespaceInfo $node): array
                     => merge($map, [(string)$node->prefix => (string)$node->namespaceURI]),
-                []
+                ['xml' => Xmlns::xml()->value()]
             ),
             reduce(
                 $allNamespaces,
@@ -37,7 +38,7 @@ public static function tryParse(Document $wsdl): Namespaces
                  */
                 static fn (array $map, NamespaceInfo $node): array
                     => merge($map, [(string)$node->namespaceURI => (string)$node->prefix]),
-                []
+                [Xmlns::xml()->value() => 'xml']
             )
         );
     }
diff --git a/tests/Unit/Metadata/Coverter/Types/Configurator/AttributeQualificationTest.php b/tests/Unit/Metadata/Coverter/Types/Configurator/AttributeQualificationTest.php
new file mode 100644
index 0000000..11b6893
--- /dev/null
+++ b/tests/Unit/Metadata/Coverter/Types/Configurator/AttributeQualificationTest.php
@@ -0,0 +1,171 @@
+<?php
+declare(strict_types=1);
+
+namespace Soap\WsdlReader\Test\Unit\Metadata\Coverter\Types\Configurator;
+
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use Soap\Engine\Metadata\Metadata;
+use Soap\Engine\Metadata\Model\Property;
+use Soap\Wsdl\Loader\CallbackLoader;
+use Soap\WsdlReader\Metadata\Wsdl1MetadataProvider;
+use Soap\WsdlReader\Wsdl1Reader;
+
+final class AttributeQualificationTest extends TestCase
+{
+    private const TNS = 'https://test';
+    private const OTHER = 'urn:other';
+    private const QUALIFIED = 'urn:qualified';
+    private const XML = 'http://www.w3.org/XML/1998/namespace';
+
+    private static ?Metadata $metadata = null;
+
+    #[DataProvider('provideAttributes')]
+    public function test_it_detects_attribute_qualification(
+        string $typeName,
+        string $propertyName,
+        bool $expectedQualified,
+        string $expectedTargetNamespace,
+    ): void {
+        $property = self::findProperty($typeName, $propertyName);
+        $type = $property->getType();
+
+        static::assertTrue($type->getMeta()->isAttribute()->unwrapOr(false));
+        static::assertSame($expectedQualified, $type->getMeta()->isQualified()->unwrapOr(false));
+        static::assertSame($expectedTargetNamespace, $type->getXmlTargetNamespace());
+    }
+
+    public static function provideAttributes(): iterable
+    {
+        yield 'ref to xml:lang' => ['Direct', 'lang', true, self::XML];
+        yield 'ref to global attribute in foreign schema' => ['Direct', 'flag', true, self::OTHER];
+        yield 'ref to global attribute in same schema' => ['Direct', 'glob', true, self::TNS];
+        yield 'local unqualified attribute' => ['Direct', 'plain', false, self::TNS];
+        yield 'local form=qualified attribute' => ['Direct', 'qual', true, self::TNS];
+
+        yield 'attributeFormDefault=qualified local attribute' => ['QualifiedByDefault', 'local', true, self::QUALIFIED];
+        yield 'attributeFormDefault=qualified local form=unqualified attribute' => ['QualifiedByDefault', 'unq', false, self::QUALIFIED];
+
+        yield 'ref inside attributeGroup' => ['Grouped', 'glob', true, self::TNS];
+        yield 'xml:lang inside attributeGroup' => ['Grouped', 'lang', true, self::XML];
+        yield 'local inside attributeGroup' => ['Grouped', 'grouped', false, self::TNS];
+        yield 'ref inside nested attributeGroup' => ['Grouped', 'flag', true, self::OTHER];
+
+        yield 'ref inherited from complexContent extension base' => ['Extended', 'glob', true, self::TNS];
+        yield 'ref declared on complexContent extension' => ['Extended', 'lang', true, self::XML];
+        yield 'local declared on complexContent extension' => ['Extended', 'extra', false, self::TNS];
+
+        yield 'ref declared on complexContent restriction' => ['Restricted', 'glob', true, self::TNS];
+
+        yield 'ref declared on simpleContent extension' => ['Text', 'lang', true, self::XML];
+        yield 'local declared on simpleContent extension' => ['Text', 'plain', false, self::TNS];
+    }
+
+    private static function findProperty(string $typeName, string $propertyName): Property
+    {
+        $type = self::metadata()->getTypes()->fetchFirstByName($typeName);
+        foreach ($type->getProperties() as $property) {
+            if ($property->getName() === $propertyName) {
+                return $property;
+            }
+        }
+
+        static::fail(sprintf('Property %s not found on type %s', $propertyName, $typeName));
+    }
+
+    private static function metadata(): Metadata
+    {
+        if (self::$metadata) {
+            return self::$metadata;
+        }
+
+        $tns = self::TNS;
+        $other = self::OTHER;
+        $qualified = self::QUALIFIED;
+        $wsdl = <<<EOXML
+        <definitions xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+                     xmlns:tns="{$tns}"
+                     xmlns:o="{$other}"
+                     xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
+                     xmlns="http://schemas.xmlsoap.org/wsdl/"
+                     targetNamespace="{$tns}">
+            <types>
+                <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="{$other}">
+                    <attribute name="flag" type="xsd:string"/>
+                    <attributeGroup name="Nested">
+                        <attribute ref="o:flag"/>
+                    </attributeGroup>
+                </schema>
+                <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="{$qualified}" attributeFormDefault="qualified">
+                    <complexType name="QualifiedByDefault">
+                        <attribute name="local" type="xsd:string"/>
+                        <attribute name="unq" type="xsd:string" form="unqualified"/>
+                    </complexType>
+                </schema>
+                <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="{$tns}">
+                    <import namespace="http://www.w3.org/XML/1998/namespace"/>
+                    <import namespace="{$other}"/>
+                    <attribute name="glob" type="xsd:string"/>
+                    <attributeGroup name="Group">
+                        <attribute ref="tns:glob"/>
+                        <attribute ref="xml:lang"/>
+                        <attribute name="grouped" type="xsd:string"/>
+                        <attributeGroup ref="o:Nested"/>
+                    </attributeGroup>
+                    <complexType name="Direct">
+                        <sequence><element name="v" type="xsd:string"/></sequence>
+                        <attribute ref="xml:lang"/>
+                        <attribute ref="o:flag"/>
+                        <attribute ref="tns:glob"/>
+                        <attribute name="plain" type="xsd:string"/>
+                        <attribute name="qual" type="xsd:string" form="qualified"/>
+                    </complexType>
+                    <complexType name="Grouped">
+                        <attributeGroup ref="tns:Group"/>
+                    </complexType>
+                    <complexType name="Base">
+                        <attribute ref="tns:glob"/>
+                    </complexType>
+                    <complexType name="Extended">
+                        <complexContent>
+                            <extension base="tns:Base">
+                                <attribute ref="xml:lang"/>
+                                <attribute name="extra" type="xsd:string"/>
+                            </extension>
+                        </complexContent>
+                    </complexType>
+                    <complexType name="Restricted">
+                        <complexContent>
+                            <restriction base="tns:Base">
+                                <attribute ref="tns:glob" use="required"/>
+                            </restriction>
+                        </complexContent>
+                    </complexType>
+                    <complexType name="Text">
+                        <simpleContent>
+                            <extension base="xsd:string">
+                                <attribute ref="xml:lang"/>
+                                <attribute name="plain" type="xsd:string"/>
+                            </extension>
+                        </simpleContent>
+                    </complexType>
+                </schema>
+            </types>
+            <message name="m"><part name="p" type="tns:Direct"/></message>
+            <portType name="pt"><operation name="test"><input message="tns:m"/></operation></portType>
+            <binding name="b" type="tns:pt">
+                <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
+                <operation name="test">
+                    <soap:operation soapAction="#test"/>
+                    <input><soap:body use="literal" namespace="{$tns}"/></input>
+                </operation>
+            </binding>
+            <service name="s"><port name="p" binding="tns:b"><soap:address location="test://"/></port></service>
+        </definitions>
+        EOXML;
+
+        $info = (new Wsdl1Reader(new CallbackLoader(static fn (): string => $wsdl)))('some.wsdl');
+
+        return self::$metadata = (new Wsdl1MetadataProvider($info))->getMetadata();
+    }
+}
diff --git a/tests/Unit/Parser/Definitions/NamespacesParserTest.php b/tests/Unit/Parser/Definitions/NamespacesParserTest.php
new file mode 100644
index 0000000..c93e3e3
--- /dev/null
+++ b/tests/Unit/Parser/Definitions/NamespacesParserTest.php
@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+namespace Soap\WsdlReader\Test\Unit\Parser\Definitions;
+
+use PHPUnit\Framework\TestCase;
+use Soap\WsdlReader\Parser\Definitions\NamespacesParser;
+use VeeWee\Xml\Dom\Document;
+
+final class NamespacesParserTest extends TestCase
+{
+    private const XML = 'http://www.w3.org/XML/1998/namespace';
+
+    public function test_it_knows_the_implicit_xml_prefix(): void
+    {
+        $namespaces = NamespacesParser::tryParse(Document::fromXmlString(
+            '<definitions xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="https://test" targetNamespace="https://test"/>'
+        ));
+
+        static::assertSame(self::XML, $namespaces->lookupNamespaceFromName('xml')->unwrap());
+        static::assertSame('xml', $namespaces->lookupNameFromNamespace(self::XML)->unwrap());
+        static::assertSame('https://test', $namespaces->lookupNamespaceFromName('tns')->unwrap());
+    }
+
+    public function test_it_keeps_an_explicit_xml_declaration(): void
+    {
+        $namespaces = NamespacesParser::tryParse(Document::fromXmlString(
+            '<definitions xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:xml="' . self::XML . '"/>'
+        ));
+
+        static::assertSame(self::XML, $namespaces->lookupNamespaceFromName('xml')->unwrap());
+        static::assertSame('xml', $namespaces->lookupNameFromNamespace(self::XML)->unwrap());
+    }
+}