Categories: SOAPTutorial

SOAP Message Structure

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 specifications are subject to change. So keep updating yourself with the latest specifications available W3 website.


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

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>

References
1. Wikipedia for SOAP

 

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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