This chapter shows the subsumption computation techniques for a LOGIDATA+ schema allowing cyclic definitions for classes. The formal framework LOGIDATA_CYC*, which extends LOGIDATA* to perform taxonomic reasoning in the presence of cyclic class definitions is introduced. It includes the notions of possible instances of a schema; legal instance of a schema, defined as the greatest fixed-point of possible instances; subsumption relation. On the basis of this framework, the definitions of coherent type and consistent class are introduced and the necessary algorithms to detect incoherence and compute subsumption in a LOGIDATA+ schema are given. Some examples of subsumption computation show its feasibility for schema design and validation.

Taxonomic Reasoning with Cycles in LOGIDATA+ / Beneventano, Domenico; Bergamaschi, Sonia; Sartori, C.. - STAMPA. - 701:(1993), pp. 105-128.

Taxonomic Reasoning with Cycles in LOGIDATA+

BENEVENTANO, Domenico;BERGAMASCHI, Sonia;
1993

Abstract

This chapter shows the subsumption computation techniques for a LOGIDATA+ schema allowing cyclic definitions for classes. The formal framework LOGIDATA_CYC*, which extends LOGIDATA* to perform taxonomic reasoning in the presence of cyclic class definitions is introduced. It includes the notions of possible instances of a schema; legal instance of a schema, defined as the greatest fixed-point of possible instances; subsumption relation. On the basis of this framework, the definitions of coherent type and consistent class are introduced and the necessary algorithms to detect incoherence and compute subsumption in a LOGIDATA+ schema are given. Some examples of subsumption computation show its feasibility for schema design and validation.
LOGIDATA+: Deductive Databases with Complex Objects
9783540569749
SPRINGER
GERMANIA
Taxonomic Reasoning with Cycles in LOGIDATA+ / Beneventano, Domenico; Bergamaschi, Sonia; Sartori, C.. - STAMPA. - 701:(1993), pp. 105-128.
Beneventano, Domenico; Bergamaschi, Sonia; Sartori, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/460938
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