Model-driven development of composite applications

In service-oriented architectures, composite applications (CA) are created by assembling existing software services. Model-driven development does not implement a CA directly, but starts from models that describe the services and their interactions (and map to source code). This article classifies existing approaches for the model-driven development of CAs. Based on a small example it is demonstrated that current approaches do not support the development of CAs where the order of service calls is not constrained and depends on user input. To solve this problem, a new approach for the composition of web services is presented, which combines the Service Component Architecture (SCA) and state transition models.