Web Services Description Language ( WSDL ).

The standard format for describing a web service. Expressed in XML, a WSDL definition describes how to access a web service and what operations it will perform. WSDL makes it easy to for consumer to invoke the webservice.

Universal Description Discovery and Integration ( UDDI ).

A service consumer must be able to locate a web service in order to use it This is known as discovery. it defines a searchable registry of services and description so that consumer can automatically discover services they need.

Simple Object Access Protocol ( SOAP ).

SOAP is a lightweight protocol intended for exchanging structured information in a decentralized, distributed environment. Basically it's a protocol on top of which webservic can work. Soap can be much betterly used for cross platform ( Operating System and Programming language )integration than using COM and CORBA.

XML Messaging.

	XML
Application	<        >	Application
	Message

XML Messaging is where applications exchange information using XML Documents.

It's ths basis of SOAP. As XML is not tied any particular application, operating system or
programming language, two applications regardless of their O.S, lang or implementation details can openely share information using a simple message encoded in way that both application can understand. SOAP provide standard way to structure XML Messages.

web service deployment descriptor (WSDD).

After the development of WebService, WSDD is needed to deploy the Web service on Tomcat-Axis.

More Coming Soon..