Integrating heterogeneous variability modeling approaches with invar, tool demonstration

There have been several proposals to describe the variability of software product lines by using modeling languages. In larger or-ganizations or projects (e.g., multi product line environments) this can lead to a situation where multiple variability modeling tech-niques are used simultaneously. Rather than enforcing a single modeling language, we present an integrative infrastructure that provides a unified perspective for users configuring products in such multi product line environments, regardless of the different modeling methods and tools used internally. In this tool demonstra-tion paper, we present a prototypical implementation of our frame-work based on Web services. So far, the prototype has been used with a feature-based, an OVM-style and a decision-oriented vari-ability modeling approach