SOAP - Messages

A SOAP message is an ordinary XML document containing the following elements −

  • Envelope − Defines the start and the end of the message. It is a mandatory element.

  • Header − Contains any optional attributes of the message used in processing the message, either at an intermediary point or at the ultimate end-point. It is an optional element.

  • Body − Contains the XML data comprising the message being sent. It is a mandatory element.

  • Fault − An optional Fault element that provides information about errors that occur while processing the message.

All these elements are declared in the default namespace for the SOAP envelope −

The default namespace for SOAP encoding and data types is −

Note − All these specifications are subject to change. Thus, keep updating yourself with the latest specifications available on the W3 website.

SOAP - Message Structure

The following block depicts the general structure of a SOAP message −

<?xml version = "1.0"?> 
xmlns:SOAP-ENV = "" 
SOAP-ENV:encodingStyle = "">