Only the Insane should deal with this

SOAP Envelope
    
<?xml version="1.0" encoding="UTF-8"?>

<SOAP-ENV:Envelope
  xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
  xmlns:ns4="http://soapinterop.org/"
  SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
SOAP Headers
    
<SOAP-ENV:Header>
<inputString xsi:type="xsd:string">hello world!</inputString>
</SOAP-ENV:Header>
SOAP Body
    
<SOAP-ENV:Body>
<ns4:echoString>
<inputString xsi:type="xsd:string">hello world!</inputString>
</ns4:echoString>
</SOAP-ENV:Body>
SOAP Envelope
    
</SOAP-ENV:Envelope>