Entity-generating Schema Transformations for Entity-Relationship Models

Research output: Contribution in Book/Catalog/Report/Conference proceedingConference contribution


The paper is a contribution to the problem of semantics-preserving schema restructuring. First, the notion of schema transformation is precisely analysed, its properties of reversibility are stated and an adequate notation is proposed. Then, the paper develops a general family of entity-generating transformations, i.e. operations that add/remove entity types in a schema. This generic transformation is proved to be able to generate not only a large number of popular E-R schema transformations, but also some powerful new ones.
Original languageEnglish
Title of host publicationProc. of the 10th Entity-Relationship Approach
Place of PublicationSan Mateo (CA)
Number of pages28
Publication statusPublished - 1991


  • schema transformation
  • database design
  • schema equivalence


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