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# Web Services Components

Over the past few years, three primary technologies have emerged as worldwide standards that make up the core of today's web services technology. These technologies are:

## - XML-RPC

This is the simplest XML based protocol for exchanging information between computers.

- XML-RPC is a simple protocol that uses XML messages to perform RPCs.
- Requests are encoded in XML and sent via HTTP POST.
- XML responses are embedded in the body of the HTTP response.
- XML-RPC is platform-independent.
- XML-RPC allows diverse applications to communicate.
- A Java client can speak XML-RPC to a Perl server.
- XML-RPC is the easiest way to get started with web services.

To learn more about XML-RPC visit XML-RPC Tutorial

## - SOAP

SOAP is an XML-based protocol for exchanging information between computers.

- SOAP is a communication protocol
- SOAP is for communication between applications
- SOAP is a format for sending messages
- SOAP is designed to communicate via Internet
- SOAP is platform independent
- SOAP is language independent
- SOAP is simple and extensible
- SOAP allows you to get around firewalls
- SOAP will be developed as a W3C standard

To learn more about SOAP visit SOAP Tutorial

## - WSDL

WSDL is an XML-based language for describing Web services and how to access them.

- WSDL stands for Web Services Description Language

- WSDL is an XML based protocol for information exchange in decentralized and distributed environments.

- WSDL is the standard format for describing a web service.

- WSDL definition describes how to access a web service and what operations it will perform.

- WSDL is a language for describing how to interface with XML-based services.

- WSDL is an integral part of UDDI, an XML-based worldwide business registry.

- WSDL is the language that UDDI uses.

- WSDL was developed jointly by Microsoft and IBM.

- WSDL is pronounced as 'wiz-dull' and spelled out as 'W-S-D-L'

To learn more about WSDL visit WSDL Tutorial

## - UDDI

UDDI is an XML-based standard for describing, publishing, and finding Web services.

- UDDI stands for Universal Description, Discovery and Integration.

- UDDI is a specification for a distributed registry of Web services.

- UDDI is platform independent, open framework.

- UDDI can communicate via SOAP, CORBA, Java RMI Protocol.

- UDDI uses WSDL to describe interfaces to web services.

- UDDI is seen with SOAP and WSDL as one of the three foundation standards of web services.

- UDDI is an open industry initiative enabling businesses to discover each other and define how they interact over the Internet.

To learn more about UDDI visit UDDI Tutorial

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