Resolve references between inline schemas without explicit imports

src/Parser/Definitions/SchemaParser.php

@@ -74,9 +74,45 @@ private static function legacySchemaNodes(Document $wsdl): array
             $result[] = $node;
         }
 
+        self::importSiblingSchemas($result);
+
         return $result;
     }
 
+    /**
+     * WSDLs often contain multiple inline schemas that reference each other without an explicit import.
+     * ext-soap treats all inline schemas as one pool of types, whereas the XSD reader only resolves
+     * references through imports. Adding the missing imports makes the inline schemas visible to each other.
+     *
+     * @param list<DOMElement> $schemaNodes
+     */
+    private static function importSiblingSchemas(array $schemaNodes): void
+    {
+        $namespaces = array_unique(array_filter(
+            array_map(
+                static fn (DOMElement $schema): string => $schema->getAttribute('targetNamespace'),
+                $schemaNodes
+            )
+        ));
+
+        foreach ($schemaNodes as $schema) {
+            $imported = [$schema->getAttribute('targetNamespace')];
+            /** @var DOMNode $child */
+            foreach ($schema->childNodes as $child) {
+                if ($child instanceof DOMElement && $child->namespaceURI === SchemaReader::XSD_NS && $child->localName === 'import') {
+                    $imported[] = $child->getAttribute('namespace');
+                }
+            }
+
+            foreach (array_diff($namespaces, $imported) as $namespace) {
+                $import = $schema->ownerDocument->createElementNS(SchemaReader::XSD_NS, 'import');
+                assert($import instanceof DOMElement);
+                $import->setAttribute('namespace', $namespace);
+                $schema->insertBefore($import, $schema->firstChild);
+            }
+        }
+    }
+
     /**
      * TODO: Can be removed once goetas-webservices/xsd-reader supports Dom\Element.
      */

tests/PhpCompatibility/schema1017.phpt

@@ -0,0 +1,34 @@
+--TEST--
+SOAP XML Schema 1017: Inline schemas referencing each other without explicit imports
+--FILE--
+<?php
+include __DIR__."/test_schema.inc";
+$schema = <<<EOF
+    <element name="Vehicle" type="string"/>
+    <complexType name="testType" xmlns:other="http://test-uri/other/">
+        <sequence>
+            <element name="selection" type="other:Selection"/>
+        </sequence>
+    </complexType>
+    </schema>
+    <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://test-uri/" targetNamespace="http://test-uri/other/">
+    <complexType name="Selection">
+        <sequence>
+            <element ref="ns1:Vehicle"/>
+        </sequence>
+    </complexType>
+EOF;
+test_schema($schema,'type="tns:testType"');
+?>
+--EXPECT--
+Methods:
+  > test(testType $testParam): void
+
+Types:
+  > http://test-uri/:testType {
+    Selection $selection
+  }
+  > http://test-uri/:Vehicle extends anySimpleType
+  > http://test-uri/other/:Selection {
+    string $Vehicle
+  }