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Business Process and Workflow Modeling in Web Services

In large organizations, typical systems portfolios consist of a mix of legacy systems, proprietary applications, databases, off-the-shelf packages, and client-server systems. Software systems integration is always an important issue and yet a very complex and difficult area in practice. Consider the software integration between two organizations on a supply chain; the level of complexity and difficulty multiply quickly. How to make heterogeneous systems work with each other within an enterprise or across the Internet is of paramount interest to businesses and industry. Web services technologies are being developed as the foundation of a new generation of businessto-business (B2B) and enterprise application integration (EAI) architectures, and important parts of components as grid (www.grid.org), wireless, and automatic computing (Kreger, 2003). Early technologies in achieving software application integration use standards such as the common object request broker architecture (CORBA) of the Object Management Group (www.omg.org), the distributed component object model (DCOM) of Microsoft, and Java/RMI, the remote method invocation mechanism. CORBA and DCOM are tightly coupled technologies, while Web services are not. Thus, CORBA and DCOM are more difficult to learn and implement than Web services. It is not surprising that the success of these standards is marginal (Chung, Lin, & Mathieu, 2003). The development and deployment of Web services requires no specific underlying technology platform. This is one of the attractive features of Web services. Other favorable views on the benefits of Web services include: a simple, lowcost EAI supporting the cross-platform sharing of functions and data; and an enabler of reducing integration complexity and time (Miller, 2003). To reach these benefits, however, Web services should meet many technology requirements and capabilities. Some of the requirements include (Zimmermann, Tomlinson & Peuser, 2003):