Web Services

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Web Services UDDI

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• Web services are distributed components that
  communicate
• using standard protocols such as Simple Object
  Access
• Protocol (SOAP) and HTTP.
• Web services exposes callable API functions,
  better known
• as Web Methods over the Internet.
• Web services publish details of their interface
  using XML
• vocabulary called Web Services Description
  Language(WSDL).

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• WSDL describes the interface for the Web
  service.
• WSDL is an XML-based vocabulary that describes
  the set
• of SOAP messages that a Web service supports.
• Every Web service has an associated WSDL file
  that
• documents the Web methods including their
  arguments
• and return types.

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• Generates a proxy class that can be used by the
  Web
• service consumers for communicating with the
  Web
• service.
• .NET also provides a default service description
  screen that
• summarizes the WSDL information in a readable
  format.
• Automatic generation of XML based WSDL.
• Avoids handling SOAP responses and requests.

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• The proxy class assembles the requests and
  responses
• in the correct format.
• Web services are stateless.
• Web services are platform and language agnostic.

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• Universal Description, Discovery and Integration
  (UDDI)
• is a specification for building distributed
  databases that
• enable interested parties to discover each
  others
• Web services.
• Provides easy discovery, sharing, and reuse of
  Web
• services and other programmable resources.

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• UDDI sites publish a pair of SOAP-based APIs
• Inquiry API
• Publisher API .
• UDDI services enables companies to run their own
• private UDDI service for use on the corporate
• intranet or extranet.

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• UDDI Services helps companies organize and
• catalog programmatic resources.
• The four core entities that you need to model
  when
• developing UDDI services are
•     Provide
•         Service
•          Binding
•          tModel

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• .NET provides high-level tools to query UDDI
  business
• registries and generate wrapper classes that
  allow
• them to place calls to the Web services.