, 2005).
By using a universal communication medium (Internet, extranet) and an integration
system, a company can attract additional partners (customers, suppliers, government,
Rabaey, Tromp, Vandenborre, Vand jck, and T mmerman
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
etc.) and improve its organisational effectiveness and efficiency (Barry, 2003) in a
SOA environment (see also http://www.service-architecture.com). As a matter of
fact, Web services make it possible to exchange data and to participate in business
processes between companies as well as different business units within the same
company.
A Web service can also be the interface between an application and the so-called
executable workflows. BPEL4WS is the main effort in this domain.
The BPEL4WS or BPEL is an extensible markup language (XML)-based language
for the formal specification of business processes, where each step in the business
process is executed by a Web service (Barry, 2003; Rabaey et al.
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