|Also Known As:|
|Intent:||To represent basic knowledge about transitions (events, states, processes, objects).|
|Solution description:||This pattern composes the Time-indexed participation, Region, and Sequence patterns in order to represent changing of states for objects, fired by some event, through an underlying process.|
|Reusable OWL Building Block:||http://ontologydesignpatterns.org/cp/owl/transition.owl (130)|
|Consequences:|| We are able to represent part of the semantics involved in transitions (e.g. what is implied by Petri Nets): initial and final states, causal events, underlying processes, affected objects, and sequences of time intervals for situations and events.
However, it is not possible to define axioms for automatically infer initial and final states from time sequences, because coreference is not allowed in OWL (not even in OWL2).
|Scenarios:||The addition of Bud Powell on piano made the tune jump from a static, aerial comping into a hard driving swing improvisation|
|Examples (OWL files):|
The Transition Content OP locally defines the following ontology elements:
A transition is a Situation that creates a context for three TimeInterval(s), two additional different Situation(s), one Event, one Process, and at least one Object: the Event is observed as the cause for the transition, one Situation is the state before the transition, the second Situation is the state after the transition, the Process is the invariance under some different transitions (including the one represented here), in which at least one Object is situated. Finally, the time intervals position the situations and the transitional event in time.
This class of situations partly encodes the ontology underlying typical engineering algebras for processes, e.g. Petri Nets.
A full representation of the transition ontology is outside the expressivity of OWL, because we would need qualified cardinality restrictions, coreference, property equivalence, and property composition.
A simple pattern to represent transitions between states.