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What is Simple Object Access Protocol (SOAP)?
Author : Abhishek
Simple Object Access Protocol (SOAP) is a protocol standard that defines how two objects in
different processes can communicate through XML data exchange. The importance of Simple
Object Access Protocol (SOAP) is now related to Web Application and Cloud Computing. This
protocol is derived from a protocol created in 1998 - XML-RPC. SOAP was created by
Microsoft, IBM and others. It is maintained by the XML Protocol Working Group of the W3C.
Simple Object Access Protocol or SOAP : Basics
Simple Object Access Protocol (SOAP) is based on XML to represent the data and is
propagated through the Internet protocols of the transport and application layer for the
transmission of messages. The most common combination of SOAP is the usage over HTTP
and TCP. SOAP can be used via SMTP, FTP, HTTP or JMS. The data is not mandatory to be in
XML format, other formats such as CSV are also supported. The acronym SOAP is not officially
died since version 1.2 as it became a misnomer.
SOAP can form the foundation layer of a stack of web services, providing a basic messaging
framework in which web services can be built. This XML based protocol consists of three parts:
an envelope, which defines what is there in the message and how to process it, a set of
encoding rules for expressing instances of data types, and a convention for representing the
procedure calls and answers. The SOAP protocol has three main features:
1. Extensibility (security and WS-routing extensions are applied)
2. Neutrality (SOAP can be used over any transport protocol such as HTTP, SMTP, TCP or
JMS )
3. Independence (SOAP allows for any programming model)
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Implementations of SOAP
1. Apache CXF (continuation of Codehaus XFire ), Apache Axis ( Java EE ), mSOAP,
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Technology Blog
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kSOAP and Java API for XML Web Services API for Java
AWS Web Development Framework
Curl package in CURL.XML.SOAP
cSOAP and gSOAP for C/C++
PHP: SOAP, nuSOAP and PEAR SOAP project for PHP
Python SOAP, ZSI, SOAPpy and SUDS are SOAP libraries for Python
SOAP :: WSDL open source toolkit for Perl
SOAP for VisualWorks Smalltalk
WebMethods GLUE
Soap4r and Savon for Ruby
TCLSOAP for the scripting language Tcl
.NET Framework 2.0: For serialization in
System.Runtime.Serialization.Formatters.Soap, System.Web.Services
13. .NET Framework 3.x/4.x: WCF, System.Web.Services
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Application developers today can use the email infrastructure of the Internet to transmit SOAP
messages as text or email.
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