A SOAP message is an ordinary XML document containing the following elements.
Envelope: ( Mandatory )
Defines the start and the end of the message.
Header: ( Optional )
Contains any optional attributes of the message used in processing the message, either at an intermediary point or at the ultimate end point.
Body: ( Mandatory )
Contains the XML data comprising the message being sent.
Fault: ( Optional )
An optional Fault element that provides information about errors that occurred while processing the message
All these elements are declared in the default namespace for the SOAP envelope:
http://www.w3.org/2001/12/soap-envelope
and the default namespace for SOAP encoding and data types is:
http://www.w3.org/2001/12/soap-encoding
NOTE: All these specificiations are subject to change. So keep updating yourself with the latest specifications available W3 website.
A SOAP Message Structure
<?xml version="1.0"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://www.w3.org/2001/12/soap-envelope"
SOAP-ENV:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<SOAP-ENV:Header>
...
...
</SOAP-ENV:Header>
<SOAP-ENV:Body>
...
...
<SOAP-ENV:Fault>
...
...
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP_ENV:Envelope>
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