Web Services

A Web service is a method of communications between two electronic devices over the World Wide Web. It is a software function provided at a network address over the web with the service always on as in the concept of utility computing.

 Web Service Elements:

WSDL

  • WSDL stands for 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

  • SOAP stands for 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

UDDI

  • UDDI stands for Universal Description, Discovery and Integration
  • UDDI is a directory service where companies can search for Web services.
  • UDDI is described in WSDL
  • UDDI communicates via SOAP

What is RDF?

  • RDF stands for Resource Description Framework
  • RDF is a framework for describing resources on the web
  • RDF is designed to be read and understood by computers
  • RDF is not designed for being displayed to people
  • RDF is written in XML
  • RDF is a part of the W3C's Semantic Web Activity
  • RDF is a W3C Recommendation

RDF - Examples of Use

  • Describing properties for shopping items, such as price and availability
  • Describing time schedules for web events
  • Describing information about web pages (content, author, created and modified date)
  • Describing content and rating for web pictures
  • Describing content for search engines
  • Describing electronic libraries


XML web services:XML web services use eXtensible Markup Language (XML) messages that follow the SOAP standard and have been popular with traditional enterprises. In such systems, there is often a machine-readable description of the operations offered by the service written in Web Services Description Language (WSDL). The latter is not a requirement of a SOAP endpoint, but is a prerequisite for automated client-side code generation in many Java and .NET SOAP frameworks (frameworks such as Apache Axis2, Apache CXF,Spring, and gSOAP being notable exceptions). Some industry organizations, such as the WS-I, mandate both SOAP and WSDL in their definition of a web service.

Labels:

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)