Web Services Architecture
Web Services Stack
Web Services Definition
A collection of XML-based technologies developed by the e-business community
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
XML is the basis for Web services
How Does it Work
The basic Web services platform is XML + HTTP
XML provides a language which can be used between different platforms and programming languages and still express complex messages and functions.
Web services platform elements:
SOAP (Simple Object Access Protocol)
UDDI (Universal Description, Discovery and Integration)
WSDL (Web Services Description Language)
SOAP (Simple Object Access Protocol)
SOAP is an XML-based protocol to let applications exchange information over HTTP.
SOAP is a communication protocol
SOAP is a format for sending messages
SOAP is designed to communicate 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 standard
WSDL (Web Services Definition Language)
An XML-based language for describing Web Services.
WSDL is based on XML
WSDL is used to describe Web services
WSDL is used to locate Web services
WSDL is a W3C standard
It does not depend on the underlying protocol.
But: It is not much human-readable.
UDDI (Universal Description, Discovery and Integration)
UDDI is a directory service where companies can register and search for Web services.
UDDI is a directory for storing information about web services
UDDI is a directory of web service interfaces described by WSDL
UDDI communicates via SOAP
UDDI is built into the Microsoft .NET platform