TOQL: Temporal Ontology Querying Language

Evdoxios Baratis, Euripides G.M. Petrakis, Sotiris Batsakis, Nikolaos Maris, Nikolaos Papadakis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

21 Citations (Scopus)


We introduce TOQL, a query language for querying time information in ontologies. TOQL is a high level query language that handles ontologies almost like relational databases. Queries are issued as SQL-like statements involving time (i.e., time points or intervals) or high-level ontology concepts that vary in time. Although independent from TOQL, this work suggests a mechanism for representing time evolving concepts in ontologies based on the four-dimensional perdurantist mechanism. However, TOQL prevents users from being familiar with the representation of time in ontologies. To show proof of concept, an application has been developed that supports translation and execution of TOQL queries on temporal ontologies combined with a reasoning mechanism based on event calculus. A real world temporal ontology is also implemented on which several TOQL example queries are processed and discussed.

Original languageEnglish
Title of host publicationAdvances in Spatial and Temporal Databases
Subtitle of host publication11th International Symposium, SSTD 2009 Aalborg, Denmark, July 8-10, 2009 Proceedings
EditorsNikos Mamoulis, Thomas Seidl, Torben Bach Pedersen, Kristian Torp, Ira Assent
PublisherSpringer-Verlag Berlin Heidelberg
Number of pages17
VolumeLNCS 5644
ISBN (Electronic)9783642029820
ISBN (Print)3642029817, 9783642029813
Publication statusPublished - 30 Jun 2009
Externally publishedYes
Event11th International Symposium on Spatial and Temporal Databases - Aalborg, Denmark
Duration: 8 Jul 200910 Jul 2009
Conference number: 11

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
PublisherSpringer-Verlag Berlin Heidelberg
Volume5644 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference11th International Symposium on Spatial and Temporal Databases
Abbreviated titleSSTD 2009
Internet address


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