Metadata model to record conceptual data models
Figure E.1 shows a metadata model to support the concepts of conceptual data modelling. It has three major entity types – ENTITY, ATTRIBUTE and DOMAIN.
To handle the exclusive arc concept there are the RELATIONSHIP GROUP and RELATIONSHIP END entities in the model. A RELATIONSHIP GROUP links one or more RELATIONSHIP ENDS to their host ENTITY such that these RELATIONSHIP ENDS within the RELATIONSHIP GROUP are mutually exclusive. The two RELATIONSHIP ENDS at each end of a relationship are associated through the relationship where each RELATIONSHIP ENDmust bepaired withone and only oneRELATIONSHIP END. Since exclusive arcs are rare, in most cases there is only one RELATIONSHIP END in a RELATIONSHIP ...
Get Principles of Data Management now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
