It is a common XML document that contains
the elements as a SOAP message
-Envelope: It is an obligatory root element
that translates the XML document and defines 
the beginning and end of the message.
-Header: It is an optional item which contains
information about the message being sent.
-Body: It contains the XML data comprising 
the message being sent.
-Fault: It provides the information on errors
that occurred while during message processing.