I'm new to sending SOAP requests. I use XMLspy and SOAPUi to construct the SOAP request. I'm happy what each will give. But I would like to understand how the targetnamespace in the wsdl is used to construct the SOAP request.

Can I use the messagename instead of the targetnamespace?

*----- snip of the WSDL ------*
.
.
<xsd:schema targetNamespace="SOAP_Requests" elementFormDefault="qualified">
      <xsd:element name="Receive-SOAP-Request">
            <xsd:complexType>
                  <xsd:all>
                        <xsd:element name="mydata" type="xsd:anyType" minOccurs="1">
                              <xsd:annotation>
                                    <xsd:documentation>String formatted XML data</xsd:documentation>
                              </xsd:annotation>
                        </xsd:element>
                  </xsd:all>
            </xsd:complexType>
      </xsd:element>
.
.
</xsd:schema>
    <wsdl:message name="SOAP_Requests_Receive-SOAP-Request-Request">
        <wsdl:part name="parameters" element="ns2:Receive-SOAP-Request-Request"/>
    </wsdl:message>
.
.
    <wsdl:portType name="WorkflowPortType">
        <wsdl:operation name="SOAP_Requests_Receive-SOAP-Request">
            <wsdl:input message="tns:SOAP_Requests_Receive-SOAP-Request-Request"/>
            <wsdl:output message="tns:SOAP_Requests_Receive-SOAP-Request-Response"/>
        </wsdl:operation>
    </wsdl:portType>


*----- SOAP that works ------*

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:myops.com:bmp:wflow" xmlns:oas="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:soap="SOAP_Requests">
   <soapenv:Header>
.
   </soapenv:Header>
   <soapenv:Body>
      <soap:Receive-SOAP-Request-Request>
            <soap:mydata>
                 my data here
            </soap:mydata>
      </soap:Receive-SOAP-Request-Request>
   </soapenv:Body>
</soapenv:Envelope>


*----- This construct will also work ------*
*----- but why does "xmldata" not have a prefix? ---*

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
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  <soapenv:Body>
        <Receive-SOAP-Request-Request xmlns="SOAP_Requests">
              <mydata>
                  my data here
              </mydata>
        </Receive-SOAP-Request-Request>
  </soapenv:Body>
.
.



*----- questionable SOAP call ------*

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:oas="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
   <soapenv:Header>
.
.
   </soapenv:Header>
   <soapenv:Body>
      <SOAP_Requests_Receive-SOAP-Request-Request xmlns="urn:myops.com:bmp:wflow">
           <mydata xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:string">
                my data here
           </mydata>
.
.
      </SOAP_Requests_Receive-SOAP-Request-Request>
   </soapenv:Body>
</soapenv:Envelope>