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Web Services: Ibm Mqseries
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All collaborations in the Web Services architecture have the possibility of being controlled by a configurable, negotiable set of environmental prerequisites. An environmental prerequisite is any nonfunctional component or infrastructure mechanism that must be made operational before a service can be invoked -- for example, the use of a particular communications mechanism (HTTPS, IBM MQSeries), or the use of a particular third-party auditing or billing service. These components (often, themselves, implemented as services) must be put in place before the service can actually be invoked.
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The Web Service Description Language (WSDL) provides an XML grammar for defining and advertising a Web service, including a service's type. This article gives an overview of how to describe a Web service with WSDL. Frank Sommers uses Apache Axis tools to create WSDL from Java interfaces and Java classes from WSDL documents. He ... shows how to programmatically interact with WSDL based on emerging Java APIs for WSDL (JWSDL) and how to dynamically invoke Web services using IBM's reference JWSDL implementation.
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IBM's web services tutorial goes on to say that the notion of a web service would have been too inefficient to be interesting a few years ago. But the trends like cheaper bandwidth and storage, more dynamic content, the pervasiveness and diversity of computing devices with different access platforms make the need for a glue more important, while at the same time making the costs (bandwidth and storage) less objectionable.
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