Synonyms
Definition
A temporal element is a finite union of n-dimensional time intervals. Special cases of temporal elements include valid-time elements, transaction-time elements, and bitemporal elements, which are finite unions of valid-time intervals, transaction-time intervals, and bitemporal intervals, respectively.
Key Points
Assuming an n-dimensional time domain, an interval is the product of n convex subsets drawn from each of the constituent dimensions.
Given a finite, one-dimensional time domain, a temporal element may be defined equivalently as a subset of the time domain. If the time domain is unbounded and thus infinite, some subsets of the time domain are not temporal elements. These subsets cannot be enumerated in finite space. For non-discrete time domains, the same observation applies.
Temporal elements are often used as timestamps. Unlike time periods, they are closed under the set theoretic operations of union, intersection, and complement, which is a...
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Recommended Reading
Gadia S.K. Temporal element as a primitive for time in temporal databases and its application in query optimization. In Proc. 13th ACM Annual Conf. on Computer Science, 1986, p. 413.
Gadia S.K. A homogeneous relational model and query languages for temporal databases. ACM Trans. Database Syst., 13(4):418–448, December 1988.
Jensen C.S. and Dyreson C.E. (eds.). A consensus glossary of temporal database concepts – February 1998 version. In Temporal Databases: Research and Practice, O. Etzion, S. Jajodia, S. Sripada (eds.), Springer-Verlag, Berlin, 1998, pp. 367–405.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Springer Science+Business Media, LLC
About this entry
Cite this entry
Jensen, C., Snodgrass, R. (2009). Temporal Element. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1419
Download citation
DOI: https://doi.org/10.1007/978-0-387-39940-9_1419
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-387-35544-3
Online ISBN: 978-0-387-39940-9
eBook Packages: Computer ScienceReference Module Computer Science and Engineering