Abstract
The investigation subject of this paper is an extensible conceptual data model. Formal semantics of an algebra of hierarchical relations is proposed. Extensibility concept of conceptual data model is discussed. A non-formal example of extending the conceptual data model is considered. Conceptual schema is defined as a set of OPENMath attribution objects.
This work was supported by the RA MES State Committee of Science, in the frames of the research project No. 21T-1B326.
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Notes
- 1.
This is an analogous concept for the union compatibility of the relational algebra.
- 2.
The value of name(Z) is the name of the attribution object Z.
- 3.
Using a cardinality symbol \(\perp \) in the attribution object means that this object may occur exactly one time.
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Manukyan, M.G. (2022). On an Extensible Conceptual Data Model by a Non-formal Example. In: Chiusano, S., et al. New Trends in Database and Information Systems. ADBIS 2022. Communications in Computer and Information Science, vol 1652. Springer, Cham. https://doi.org/10.1007/978-3-031-15743-1_1
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