SOAP
Core Technologies
The XML Meta-Language
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WSDL

As developed in Section , the Web Service Description Language (WSDL) is a language--defined in XML--that is conceptually close to the Interface Definition Language (IDL) found in CORBA. In the Web service paradigm discussed in the last section, the role of WSDL is to expose a set of operations of a software component as a service. In order to be utilised by potential users, each WSDL document must be published, ideally in a UDDI registry (c.f. Section ) or as a simple URI.
The role of WSDL is paramount to the inter-operability of different of Web service frameworks. However, and in spite of its important role, it would be well outside the time-scope of this project to implement even part of the WSDL specifications. An augmented version of the Java interface will be utilised instead, to define a remote service. This role is referred to as service interface in the remainder of this report.