SOAP Building Blocks
A SOAP message is an ordinary XML document containing the following elements
:
A required Envelope element that identifies the XML document as a SOAP messa
ge
An optional Header element that contains header information
A required Body element that contains call and response information
An optional Fault element that provides information about errors that occurr
ed while processing the message
All the elements above are declared in the default namespace for the SOAP en
velope:
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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Syntax Rules
Here are some important syntax rules:
A SOAP message MUST be encoded using XML
A SOAP message MUST use the SOAP Envelope namespace
A SOAP message MUST use the SOAP Encoding namespace
A SOAP message must NOT contain a DTD reference
A SOAP message must NOT contain XML Processing Instructions
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Skeleton SOAP Message
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Header>
  ...
  ...
</soap:Header>
<soap:Body>
  ...
  ...
  <soap:Fault>
    ...
    ...
  </soap:Fault>
</soap:Body>
</soap:Envelope>
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