Modern software for Enterprise Application Integration (EAI) provides tools for modeling integration scenarios. A drawback of these tools is the lack of functionality for exchanging or integrating models from different EAI products. Consequently, developers are only partially able to describe real heterogeneous IT environments. Our goal is to avoid the creation of these so-called "integration islands". For that purpose we present an approach which introduces an abstract view by technology-independent and multivendor-capable modeling for both development and maintenance. With this approach, we propose a toolset- and repository-based refinement of the abstract view to automate implementation with real products and deployment on real platforms.