In: Rishe, N.; et al.: PARBASE 90. Proceedings of the International Conference on Databases, Parallel Architectures and Their Applications, 1990, Miami Beach, FL, USA, pages 1-554 pp.. Los Alamitos, CA, USA: IEEE Comput. Soc. Press, 1990.
Abstract: It is noted that the existing approaches to net refinements have the disadvantage that the final schema net remains flat and the higher level nodes of the net disappear or all nodes of all levels remain on one level in the final schema. The author proposes a refining constraint and procedure which determines a net hierarchy as a real hierarchy of nets and allows the desired refinement of S-elements and T-elements.
Keywords: net hierarchy; refinement (of net elements); higher level node.