Integrating calendar dates and qualitative temporal constraints in the treatment of periodic events

Temporal reasoning about composite and/or periodic events

“…Modelling correlation is outside the goals of this paper (further discussions on correlation are in (Morris et al 1993, Terenziani 1997). Moreover, one should also take into account the fact that plans (or protocols, or guidelines) have a 'predictive' role.…”

“…In our previous work, we defined a high-level language to deal with user-defined periodicity (Terenziani 2003a) and with period-dependent qualitative temporal constraints between repeated events (which are coped with as 'classes' of events) and constraint propagation algorithms operating on them (Terenziani 1997(Terenziani , 2003b. We also proposed an initial algorithm to check the consistency of a knowledge base of such constraints with a set of instances of events exactly located in time (Terenziani 2000).…”

“…For the sake of brevity, we assume that all the input classes and instances are correlated. It should be pointed out that this is not restrictive: in fact, since the correlation relation partitions actions (and their constraints) into independent sets (Morris et al 1993, Terenziani 1997, the algorithms can be iterated on each set. ======= insert figure 6 about here.…”

“…In fact, such constraints have to be inherited only by 'corresponding' pairs of instances of the related classes. For instance, Ex.2 does not mean that all the reservations must be done before all laboratory tests, but that each reservation must be one to seven days before the correlated (Morris et al 1993, Terenziani 1997) instance of laboratory test. For instance, in figure 1, we show a consistent scenario for the constraints in Ex.2, in which R1 is correlated to T1 and R2 to T2 (notice that the scenario is consistent even if there is a test -namely T1-that precedes a reservation -R2).…”

Applying Artificial Intelligence to Clinical Guidelines: The GLARE Approach

“…Recently, also the treatment of temporal constraints between repeated and/or periodic actions has attracted a significant attention within the AI literature (see, e.g., the survey in section 7 in [29]), while user-defined periodicity has been widely studied especially within the DataBase community (see, e.g., the survey in the introduction of [30]). On the other hand, to the best of our knowledge, in the literature there is no comprehensive approach dealing with temporal constraints between events, investigating issues 1, 2, and 3 in an integrated way.…”