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 discussed below.

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 our 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 our 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 was developed jointly by Microsoft and IBM.

• 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 is pronounced as ”wiz-dull” and spelled out as ”W-S-D-L”.

To learn more about WSDL, visit our 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, and 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 our UDDI Tutorial.