code: public static Document getSoapBody(Document soapMessage) throws Exception {
          Element envelope = soapMessage.getDocumentElement();
          Element body = DomUtils.getChildElement(DomUtils.getElementByTagName(
                  envelope, envelope.getPrefix() + ":Body"));
          Document content = DomUtils.createDocument(body);
  
          Element documentRoot = content.getDocumentElement();
          addNSdeclarations(envelope, documentRoot);
          addNSdeclarations(body, documentRoot);
          return content;
      }
docs: A method to extract the content of the SOAP body.
  
  @param soapMessage
  the SOAP message.
  
  @return the content of the body of the input SOAP message.
  
  @author Simone Gianfranceschi