SOAP syntax

SOAP Building Blocks

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

• Required Envelope Element, which can identify this XML document as a SOAP message

• Optional Header element, containing header information

• Required Body element , contains all call and response information

• The optional Fault element provides information about the error that occurred while processing this message

All The above elements are declared in the default namespace for SOAP encapsulation:

http://www.w3.org/2001/12/soap-envelope

And the default namespace for SOAP encoding and data types:

http://www.w3.org/2001/12/soap-encoding

Grammar Rules

Here are some important syntax rules:

• SOAP messages must be encoded in XML

• SOAP messages The SOAP Envelope namespace must be used

• The SOAP message must use the SOAP Encoding namespace

• The SOAP message cannot contain a DTD reference

• SOAP messages cannot contain XML processing instructions

Basic structure of SOAP messages