Notes

Outline

OE Example: Events and Roles Events in Cyc Roles and Event Predicates Actor Slots Sub-events

Events in Cyc Events are represented as individuals that: have components (are not empty space or time) are situations have temporal extent are dynamic Events are classified in Cyc collections #$Reading, #$Communicating, #$Drowning, #$Travel-TripEvent, #$WagingWar, #$Negotiating, #$Earthquake, #$SalesActivity, #$PoliticalCampaign

Partial hierarchy for #$Event

Why Reify Events? Makes it easy to add (or modify) components of individual situations and events Enables use of the #$genls hierarchy to inherit general knowledge about kinds of events Roles harness the inferential power of CycL predicates Roles are specialized predicates relating events to their components

Components of events Events involve various things as parts performers, objects, instruments sub-events, stages or processes locations or destinations How do we attach events to the things involved?

Using Roles

Roles and Events CycL uses predicates called “roles” to relate individual events to their components Predicate constraints help to characterize  kinds of events and kinds of components Relations between predicates enrich Cyc’s knowledge about things involved in events

Summary Events in Cyc Why Reify Events?  Relations between predicates enrich Cyc’s knowledge about things involved in events Components of events: Predicate constraints help to characterize  kinds of events and kinds of components Using Roles Roles and Events: CycL uses predicates called “roles” to relate individual events to their components