ERC+: An Object based Entity Relationship Approach
Stefano Spaccapietra, Christine E. Parent · 1992
Introduction 2. An overview of the ERC+ model 3. Formal definition of the ERC+ model 4. ERC+ data manipulation 5. ERC+ graphical editors 6. Decentralized database design using ERC+ 7. Conclusion References in Conceptual Modelling, Databases and CASE: An Integrated View of Information Systems Development Peri Loucopoulos and Roberto Zicari Eds. John Wiley,1992 2 1. Introduction The development of ERC+ as a new data model started in 1983 1 , as part of a project on heterogeneous distributed database systems [Spaccapietra 83]. One of the major problems was proper integration of heterogeneous schemas. Clearly, this task required accurate knowledge of the semantics of existing schemas, beyond capabilities of traditional data models. A richer semantic model was needed. Moreover, schema integration was seen as a process requiring a high amount of human communication and understanding among local database a