code: private Element addSoapEnvelopeBody(Document doc) {
  		Element env = doc.createElementNS(IfmapStrings.SOAP_ENV_NS_URI,
  				IfmapStrings.SOAP_PREFIXED_ENV_EL_NAME);
  		Element body = doc.createElementNS(IfmapStrings.SOAP_ENV_NS_URI,
  				IfmapStrings.SOAP_PREFIXED_BODY_EL_NAME);
  		doc.appendChild(env);
  		env.appendChild(body);
  
  		return body;
  	}
docs: Build the soap:Envelope and soap:Body things and return the {@link Element}
  for the soap:Body.