Summary: Periodicity-based temporal constraints
Paolo Terenziani*, Luca Anselma°, Stefania Montani*
*DI, Univ. Piemonte Orientale "A. Avogadro", Spalto Marengo 33, Alessandria, Italy
°DI, Universitą di Torino, Corso Svizzera 185, 10149 Torino, Italy
Keywords: User-defined periodicities. Periodicity-based temporal constraints. Temporal constraint propagation.
Intensional and extensional approach.
In this paper, we propose a framework for repre-
senting and reasoning about qualitative and quanti-
tative temporal constraints on periodic events. We
describe a formalism to deal with both qualitative
and quantitative "periodicity-dependent" con-
straints between repeated events, considering also
user-defined periodicities. We first propose a cor-
rect but not complete intensional approach to tem-
poral reasoning based on the operations of intersec-
tion and composition, and then we complement it
with a correct and complete extensional approach.