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by Christine Parent, Stefano Spaccapietra
in Information System Concepts: An In-depth Analysis, E.D. Falkenberg and P. Lindgreen Eds., North-Holland
ftp://lbdsun.epfl.ch/pub/./enco89.ps.Z
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Abstract:
Facilities for complex object modeling are nowadays needed in several areas of database applications (CAD/CAM, office automation, robotics,...). Consequently, either new models are developed, or existing ones (relational, functional) are extended to better respond to this requirement. This paper intends to show that the entity-relationship approach may offer the required facilities, preserving the well known advantages inherent to this approach: increased readability and graphical display of the database schema. To this aim, an enhanced entity-relationship model, called ERC+ (for Entity Relationship Complex plus generalization), is presented. The associated query facilities are presented as well, in the form of an ERC+ algebra. Finally, the paper discusses how ERC+ peculiar features (complex attribute structures, multivalued attributes, duplicates) and its algebra succeed in supporting complex object management. A comparison with object-oriented models is proposed.
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