Abstract This paper reports on ongoing research in the field of feature-based product development. The resulting ULEO approach aims at enabling a high-quality flow of information between applications and at universal automation of product model generation. This is achieved by modeling all classes of relevant objects within a Unified Model of Engineering Objects (UMEO). All types of relationships are modeled inside a dedicated meta taxonomy of relation types and materialize inside the UMEO. Informational relations represent ontological knowledge about dependencies between object classes and are suited for cross-linking of product models. Generative relations describe knowledge on how to create instances automatically.