Abstract
The p-type data model was designed first to answer database needs. Some of its features were and still are quite unusual for a DBMS and, by some aspects, make it nearer Description Logic (DL) systems than classical DBMS. Views play a central role in the model. They are defined in a hierarchical manner, with constraints on role (attribute) types as in DLs, and instance classification (view recognition) is a basic mechanism in p-type implementation by the Osiris system.
In this paper we recall the main characteristics of p-types and their semantics as a DL system. We insist on the modelling of unknown values, whose treatment leads to a three-value instance classification system. We develop database specific aspects and particularly the partitioning of the object space and its use for the management of data.
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Roger, M., Simonet, A., Simonet, M. (2001). Object Space Partitioning in a DL-Like Database and Knowledge Base Management System. In: Mayr, H.C., Lazansky, J., Quirchmayr, G., Vogel, P. (eds) Database and Expert Systems Applications. DEXA 2001. Lecture Notes in Computer Science, vol 2113. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44759-8_31
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DOI: https://doi.org/10.1007/3-540-44759-8_31
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