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   Re: [xml-dev] What are web services ?

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Razvan MIHAIU wrote:
>> find a good definition of this ?

Web services are a vehicle for collaborative Internet computing. They expose
methods that can be invoked remotely.

>> A web service must be based on SOAP in order to belong in this category? A
web service must use XML for transferring data (like SOAP) ?

SOAP, XML-RPC and REST are three types of web services, with SOAP providing
RPC-style or document-style messaging.

>> Can we have web services without WSDL and UDDI ?

WSDL and UDDI are first-generation web services technology. They provide a
solution for describing a service, discovering a service and specifying the
contract between the provider and consumer.

There's been work on more sophisticated solutions -- for example, semantic web
services based on an ontology language (OWL-S or WSMO). There's more information
in "Developing Semantic Web Services" by Peter Alesso. Here's an excerpt:


======== Ken North ===========


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