For https://github.com/mvantellingen/python-zeep/issues/503

test.wsdl

<?xml version="1.0" encoding="utf-8"?>
<wsdl:definitions
    targetNamespace="http://example.com/agreement"
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
    xmlns:tns="http://example.com/agreement"
    xmlns:s="http://www.w3.org/2001/XMLSchema"
    xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"
    xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
    <wsdl:types>
        <s:schema elementFormDefault="qualified" targetNamespace="http://example.com/agreement">
            <s:element name="CreateAgreementRequest">
                <s:complexType>
                    <s:complexContent>
                        <s:extension base="tns:BaseType">
                            <s:sequence>
                                <s:element name="Agreement">
                                    <s:complexType>
                                        <s:choice>
                                            <s:element name="Offer" type="s:boolean" fixed="true">
                                            </s:element>
                                            <s:element name="Owner">
                                                <s:complexType>
                                                    <s:choice>
                                                        <s:element name="RegOrg" type="tns:RegOrgType"></s:element>
                                                        <s:element name="Ind" type="tns:IndType"></s:element>
                                                    </s:choice>
                                                </s:complexType>
                                            </s:element>
                                        </s:choice>
                                    </s:complexType>
                                </s:element>
                            </s:sequence>
                        </s:extension>
                    </s:complexContent>
                </s:complexType>
            </s:element>
            <s:element name="CreateAgreementResponse">
                <s:simpleType>
                    <s:restriction base="s:string">
                        <s:maxLength value="100"/>
                    </s:restriction>
                </s:simpleType>
            </s:element>
            <s:complexType name="BaseType">
                <s:sequence>
                    <s:element name="base" minOccurs="0"/>
                </s:sequence>
            </s:complexType>
            <s:complexType name="RegOrgType">
                <s:sequence minOccurs="0">
                    <s:element name="orgGUID" type="s:string"/>
                </s:sequence>
            </s:complexType>
            <s:complexType name="IndType">
                <s:sequence minOccurs="0">
                    <s:element name="Surname">
                        <s:simpleType>
                            <s:restriction base="s:string">
                                <s:minLength value="1"/>
                                <s:maxLength value="60"/>
                            </s:restriction>
                        </s:simpleType>
                    </s:element>
                    <s:element name="FirstName">
                        <s:simpleType>
                            <s:restriction base="s:string">
                                <s:minLength value="1"/>
                                <s:maxLength value="60"/>
                            </s:restriction>
                        </s:simpleType>
                    </s:element>
                    <s:element name="Patronymic" minOccurs="0">
                        <s:simpleType>
                            <s:restriction base="s:string">
                                <s:minLength value="1"/>
                                <s:maxLength value="60"/>
                            </s:restriction>
                        </s:simpleType>
                    </s:element>
                </s:sequence>
            </s:complexType>
        </s:schema>
    </wsdl:types>
    <wsdl:message name="CreateAgreementSoapIn">
        <wsdl:part name="parameters" element="tns:CreateAgreementRequest"/>
    </wsdl:message>
    <wsdl:message name="CreateAgreementSoapOut">
        <wsdl:part name="parameters" element="tns:CreateAgreementResponse"/>
    </wsdl:message>
    <wsdl:portType name="AgreementServiceSoap">
        <wsdl:operation name="CreateAgreement">
            <wsdl:input message="tns:CreateAgreementSoapIn"/>
            <wsdl:output message="tns:CreateAgreementSoapOut"/>
        </wsdl:operation>
    </wsdl:portType>
    <wsdl:binding name="AgreementServiceSoap" type="tns:AgreementServiceSoap">
        <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/>
        <wsdl:operation name="CreateAgreement">
            <soap:operation soapAction="http://example.com/agreement/CreateAgreement" style="document"/>
            <wsdl:input>
                <soap:body use="literal"/>
            </wsdl:input>
            <wsdl:output>
                <soap:body use="literal"/>
            </wsdl:output>
        </wsdl:operation>
    </wsdl:binding>
    <wsdl:service name="AgreementService">
        <wsdl:port name="AgreementServiceSoap" binding="tns:AgreementServiceSoap">
            <soap:address location="http://example.com/agreement"/>
        </wsdl:port>
    </wsdl:service>
</wsdl:definitions>