Web services,WSDL,SOAP

Web Service :
  • Web services are application components
  • Web services communicate using open protocols
  • Web services are self-contained and self-describing
  • Web services can be discovered using UDDI
  • Web services can be used by other applications
  • HTTP and XML is the basis for Web services

Web service Life Cycle :




A web service has the below six life-cycle events:

1. Service Provider creates the web service and deploys it.
2. Then service provider, publishes the information about a web service in a service registry.
3. Service consumer search a service registry for available services.
4. Service consumer retrieves the information about the service.
5. Service consumer creates a web service client.
6. Web service client invokes the web service at the location specified in the service description.

NOTE:- Its not mandatory to publish the web service information in a service registry, if the service provider knows the entire list of service consumers. They can directly provide the WSDL URL / file to service consumers.

WSDL :  Web Services Description Language


  • WSDL is written in XML
  • WSDL is an XML document
  • WSDL is used to describe Web services
  • WSDL is also used to locate Web services
  • WSDL is a W3C recommendation

SOAP :  Simple Object Access Protocol

  • SOAP is a communication protocol
  • SOAP is for communication between applications
  • SOAP is a format for sending messages
  • SOAP communicates via Internet
  • SOAP is platform independent
  • SOAP is language independent
  • SOAP is based on XML
  • SOAP is simple and extensible
  • SOAP allows you to get around firewalls
  • SOAP is a W3C recommendation


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