From 3f566a70126a0a6cb7318d8787af42894a999875 Mon Sep 17 00:00:00 2001
From: Benjamin Beret <benjamin.beret@gmail.com>
Date: Sun, 28 Dec 2025 17:42:11 +0100
Subject: [PATCH 1/2] Add failing test

---
 .../request.json                              |  1 +
 .../request.xml                               |  6 ++
 .../response.json                             |  8 ++
 .../response.xml                              | 13 +++
 .../soap.wsdl                                 | 90 +++++++++++++++++++
 5 files changed, 118 insertions(+)
 create mode 100644 test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.json
 create mode 100644 test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.xml
 create mode 100644 test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.json
 create mode 100644 test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.xml
 create mode 100644 test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/soap.wsdl

diff --git a/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.json b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.json
new file mode 100644
index 000000000..0967ef424
--- /dev/null
+++ b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.json
@@ -0,0 +1 @@
+{}
diff --git a/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.xml b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.xml
new file mode 100644
index 000000000..975d95ab1
--- /dev/null
+++ b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/request.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tns="http://www.Dummy.com">
+  <soap:Body>
+    <DummyRequest xmlns="http://www.Dummy.com"></DummyRequest>
+  </soap:Body>
+</soap:Envelope>
\ No newline at end of file
diff --git a/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.json b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.json
new file mode 100644
index 000000000..520fb5ddf
--- /dev/null
+++ b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.json
@@ -0,0 +1,8 @@
+{
+  "foo": {
+    "string_simple": "",
+    "string_pattern": "",
+    "string_simple_list": [""],
+    "string_pattern_list": [""]
+  }
+}
diff --git a/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.xml b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.xml
new file mode 100644
index 000000000..26232a647
--- /dev/null
+++ b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/response.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tns="http://www.Dummy.com">
+   <soap:Body>
+      <tns:DummyResponse>
+         <tns:foo>
+            <tns:string_simple></tns:string_simple>
+            <tns:string_pattern></tns:string_pattern>
+            <tns:string_simple_list></tns:string_simple_list>
+            <tns:string_pattern_list></tns:string_pattern_list>
+         </tns:foo>
+      </tns:DummyResponse>
+   </soap:Body>
+</soap:Envelope>
\ No newline at end of file
diff --git a/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/soap.wsdl b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/soap.wsdl
new file mode 100644
index 000000000..40c1e3a3b
--- /dev/null
+++ b/test/request-response-samples/Dummy__should_handle_empty_string_with_pattern_restriction/soap.wsdl
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
+    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
+    xmlns:xs="http://www.w3.org/2001/XMLSchema"
+    xmlns:tns="http://www.Dummy.com"
+    targetNamespace="http://www.Dummy.com">
+
+  <wsdl:types>
+    <xs:schema targetNamespace="http://www.Dummy.com" elementFormDefault="qualified">
+      <xs:complexType name="ComplexType" abstract="false">
+        <xs:sequence>
+          <xs:element name="string_simple" minOccurs="1" maxOccurs="1">
+            <xs:simpleType>
+              <xs:restriction base="xs:string">
+              </xs:restriction>
+            </xs:simpleType>
+          </xs:element>
+          <xs:element name="string_pattern" minOccurs="1" maxOccurs="1">
+            <xs:simpleType>
+              <xs:restriction base="xs:string">
+                <xs:pattern value="[a-zA-Z0-9_ \-\+/\\\|\*=&lt;&gt;,.;:?!'`&quot;~@#$%^&amp;\(\)\[\]\{\}\r\n]{0,255}"/>
+              </xs:restriction>
+            </xs:simpleType>
+          </xs:element>
+          <xs:element name="string_simple_list" minOccurs="0" maxOccurs="25">
+            <xs:simpleType>
+              <xs:restriction base="xs:string">
+              </xs:restriction>
+            </xs:simpleType>
+          </xs:element>
+          <xs:element name="string_pattern_list" minOccurs="0" maxOccurs="25">
+            <xs:simpleType>
+              <xs:restriction base="xs:string">
+                <xs:pattern value="[a-zA-Z0-9_ \-\+/\\\|\*=&lt;&gt;,.;:?!'`&quot;~@#$%^&amp;\(\)\[\]\{\}\r\n]{0,255}"/>
+              </xs:restriction>
+            </xs:simpleType>
+          </xs:element>
+        </xs:sequence>
+      </xs:complexType>
+
+      <xs:element name="DummyRequest">
+        <xs:complexType>
+           <xs:sequence/>
+        </xs:complexType>
+      </xs:element>
+
+      <xs:element name="DummyResponse">
+         <xs:complexType>
+            <xs:sequence>
+                <xs:element name="foo" type="tns:ComplexType"/>
+            </xs:sequence>
+         </xs:complexType>
+      </xs:element>
+    </xs:schema>
+  </wsdl:types>
+
+  <wsdl:message name="DummyRequest">
+    <wsdl:part name="parameters" element="tns:DummyRequest"/>
+  </wsdl:message>
+  <wsdl:message name="DummyResponse">
+    <wsdl:part name="parameters" element="tns:DummyResponse"/>
+  </wsdl:message>
+
+  <wsdl:portType name="DummyPortType">
+    <wsdl:operation name="Dummy">
+      <wsdl:input message="tns:DummyRequest"/>
+      <wsdl:output message="tns:DummyResponse"/>
+    </wsdl:operation>
+  </wsdl:portType>
+
+  <wsdl:binding name="DummyBinding" type="tns:DummyPortType">
+    <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
+    <wsdl:operation name="Dummy">
+      <soap:operation soapAction="Dummy"/>
+      <wsdl:input>
+        <soap:body use="literal"/>
+      </wsdl:input>
+      <wsdl:output>
+        <soap:body use="literal"/>
+      </wsdl:output>
+    </wsdl:operation>
+  </wsdl:binding>
+
+  <wsdl:service name="DummyService">
+    <wsdl:port name="DummyPort" binding="tns:DummyBinding">
+      <soap:address location="http://localhost:1509/test"/>
+    </wsdl:port>
+  </wsdl:service>
+
+</wsdl:definitions>

From df3291978a993c026a8fe3638ca0c1f62ebee715 Mon Sep 17 00:00:00 2001
From: Benjamin Beret <benjamin.beret@gmail.com>
Date: Sun, 28 Dec 2025 21:33:44 +0100
Subject: [PATCH 2/2] Fix failing test

---
 src/wsdl/index.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wsdl/index.ts b/src/wsdl/index.ts
index 42b9d8e28..9378505c0 100644
--- a/src/wsdl/index.ts
+++ b/src/wsdl/index.ts
@@ -367,7 +367,12 @@ export class WSDL {
       const topSchema = top.schema;
       const name = splitQName(nsName).name;
 
-      if (typeof cur.schema === 'string' && (cur.schema === 'string' || cur.schema.split(':')[1] === 'string')) {
+      /**
+       * When parsing a string element, we need to correctly transform `<tag></tag>`
+       * to an empty string.
+       */
+      const isStringElement = typeof cur.schema === 'string' && splitQName(cur.schema).name === 'string';
+      if (isStringElement) {
         if (typeof obj === 'object' && Object.keys(obj).length === 0) {
           obj = cur.object = this.options.preserveWhitespace ? cur.text || '' : '';
         }