: Architectural mismatches are a recognized obstacle to successful software reuse. An architectural mismatch occurs when two or more software components are connected to form a system and those components make differing and incompatible assumptions about their interactions or the environment in which they exist. Mismatch detection and avoidance has been previously discussed in existing literature. These typically take the form of generic rules and guidelines. Service Oriented Architectures (SOA) are becoming one of the main trends in the current engineering of software. Using web services, as defined by W3C Web Services Architecture Working Group, supports the engineering of SOA by providing rules and restrictions that apply to the definition of web services and how they can interact with other components to form a larger system. We see this as an opportunity to define a web services style with