Abstract
From a formal point of view, a constraint can be seen as a relationship that has to be satisfied. With respect to data and information modelling, constraints provide a declarative and elegant means to represent data in an efficient way. Moreover, constraints support the definition of data semantics. For example, the set of valid temperatures t on earth can be defined as ranging from a high of 57 degrees Celcius to -70 degrees Celcius, which can be described by the constraint t ∈ [-70°C, 57°C] or, using linear arithmetic, by (t ≥ -70°C) ∧ (t ≤ 57°C).
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de Tré, G., de Caluwe, R., Verstraete, J., Hallez, A. (2004). The Applicability of Generalized Constraints in Spatio-Temporal Database Modelling and Querying. In: de Caluwe, R., de Tré, G., Bordogna, G. (eds) Spatio-Temporal Databases. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09968-1_7
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DOI: https://doi.org/10.1007/978-3-662-09968-1_7
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