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A SOAP message is an ordinary XML document containing the following elements:
Envelope element
It identifies the XML document as a SOAP message.A SOAP message always appears within an envelope.
Header element
Header element is optional and it contains header information.
Body element
Body element is required and it contains call and response information.
Fault element
Fault element is optional. It provides information about errors that
occurred while processing the message.
All the elements above 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
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