The lack of a formal model of events hinders interoperability in distributed event-based systems. In this paper, we present a formal model of events, called Event-Model-F. The model is based on the foundational ontology DOLCE+DnS Ultralite (DUL) and provides comprehensive support to represent time and space, objects and persons, as well as mereological, causal, and correlative relationships between events. In addition, the Event-Model-F provides a flexible means for event composition, modeling event causality and event correlation, and representing different interpretations of the same event. The Event-Model-F is developed following the pattern-oriented approach of DUL, is modularized in different ontologies, and can be easily extended by domain specific ontologies. 1.

Abstract—In this paper, a joint content-event model for indexing multimedia data is proposed. The event part of the model follows a number of formal principles to represent several aspects of real-life events, whereas the content part is used to describe the decomposition of any type of multimedia data to content segments. In contrast to other event models for multimedia indexing, the proposed model treats events as first class entities and provides a referencing mechanism to link real-life event elements with content segments at multiple granularity levels. This referencing mechanism has been defined with the objective to facilitate the automatic enrichment of event elements with information extracted by automatic analysis of content segments, enabling event-centric multimedia indexing in large-scale multimedia collections. Keywords-events; multimedia content; content-event model; event-based indexing; I.

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