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Trajecto Trajectory Events Module
Release: 2026-03-29
- Modified on: 2026-10-01
- This version:
- http://w3id.org/trajecto/events/1.1.0
- Latest version:
- http://w3id.org/trajecto/events
- Previous version:
- http://w3id.org/trajecto/events/1.0
- Revision:
- 1.1.0
- Issued on:
- 2026-10-01
- Authors:
- Sotirios Angelis, University of the Aegean
- Konstantinos Kotis, University of the Aegean
- Publisher:
- i-Lab, Department of Cultural Technology and Communication, University of the Aegean
- Imported Ontologies:
- poi
- Source:
- https://github.com/sotirisAng/trajecto-stakg/blob/main/ontology/modules/events.ttl
- Download serialization:
- License:
- Visualization:
- Cite as:
- Angelis, S. (2026). Semantic Trajectory Analytics and Recommender Systems: Engineering Semantic Trajectories as Knowledge Graphs. Doctoral dissertation, University of the Aegean.
Ontology Specification
Abstract
Trajectory events detected over the position sequence of a trajectory: engagement escalation and drop, category discovery, transition and return, and the dominant encounter.Introduction back to ToC
Source: https://github.com/sotirisAng/trajecto-stakg/blob/main/ontology/modules/events.ttl. The whole ontology is documented from http://w3id.org/trajecto (the core module), which imports every module.Namespace declarations
| datacron | <http://www.datacron-project.eu/datAcron#> |
| dcterms | <http://purl.org/dc/terms/> |
| dul | <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#> |
| events | <http://w3id.org/trajecto/events#> |
| owl | <http://www.w3.org/2002/07/owl#> |
| rdf | <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| rdfs | <http://www.w3.org/2000/01/rdf-schema#> |
| vann | <http://purl.org/vocab/vann/> |
| xml | <http://www.w3.org/XML/1998/namespace> |
| xsd | <http://www.w3.org/2001/XMLSchema#> |
trajecto-events: Overview back to ToC
This ontology has the following classes and properties.Classes
- Category Discovery
- Category Return
- Category Transition
- Dominant Encounter
- Engagement Drop
- Engagement Escalation
- Trajectory Event
Object Properties
Data Properties
trajecto-events: Description back to ToC
Trajectory events detected over the position sequence of a trajectory: engagement escalation and drop, category discovery, transition and return, and the dominant encounter.Cross-reference for trajecto-events classes, object properties and data properties back to ToC
This section provides details for each class and property defined by trajecto-events.Classes
- Category Discovery
- Category Return
- Category Transition
- Dominant Encounter
- Engagement Drop
- Engagement Escalation
- Trajectory Event
Category Discoveryc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#CategoryDiscovery
First meaningful encounter with a POI category not previously visited in this trajectory. The discoveredCategory property identifies which category was new.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
- is in domain of
- discovered category op
Category Returnc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#CategoryReturn
Return to a previously visited POI category after visiting a different category. Subtype of CategoryTransition where the toCategory was already encountered earlier in the trajectory.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
Category Transitionc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#CategoryTransition
Transition between consecutive meaningful interactions at POIs of different categories. The fromCategory and toCategory properties identify the transition.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
- is in domain of
- from category op, to category op
Dominant Encounterc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#DominantEncounter
The position where the trajectory's DominantInteraction (highest engagement, singleton per trajectory) occurs.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
- is disjoint with
- Engagement Drop c, Engagement Escalation c
Engagement Dropc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#EngagementDrop
Transition from MeaningfulInteraction or ImmersiveInteraction to PassingInteraction at the next position. Indicates disengagement or transit.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
- is disjoint with
- Dominant Encounter c, Engagement Escalation c
Engagement Escalationc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#EngagementEscalation
Transition from PassingInteraction at one position to MeaningfulInteraction or ImmersiveInteraction at the next consecutive position. Indicates increasing engagement with the environment.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Trajectory Event c
- is disjoint with
- Dominant Encounter c, Engagement Drop c
Trajectory Eventc back to ToC or Class ToC
IRI: http://w3id.org/trajecto/events#TrajectoryEvent
A behavioral transition or notable occurrence within a trajectory, detected from the sequence of its positions and the types of their interactions.
- Is defined by
- http://w3id.org/trajecto/events
- has super-classes
- Event c
- has sub-classes
- Category Discovery c, Category Return c, Category Transition c, Dominant Encounter c, Engagement Drop c, Engagement Escalation c
- is in domain of
- at position op, event sequence index dp, from interaction type op, to interaction type op
Object Properties
at positionop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#atPosition
The position at which the event occurs within the trajectory.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Trajectory Event c
- has range
- Raw Position c
discovered categoryop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#discoveredCategory
The POI category encountered for the first time at this position.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Category Discovery c
from categoryop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#fromCategory
The POI category at the preceding position in a category transition.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Category Transition c
from interaction typeop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#fromInteractionType
The interaction type at the preceding position in an engagement transition event.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Trajectory Event c
to categoryop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#toCategory
The POI category at the current position in a category transition.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Category Transition c
to interaction typeop back to ToC or Object Property ToC
IRI: http://w3id.org/trajecto/events#toInteractionType
The interaction type at the current position in an engagement transition event.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Trajectory Event c
Data Properties
event sequence indexdp back to ToC or Data Property ToC
IRI: http://w3id.org/trajecto/events#eventSequenceIndex
The position index at which the event occurs, corresponding to hasPositionIndex of the associated RawPosition.
- Is defined by
- http://w3id.org/trajecto/events
- has domain
- Trajectory Event c
- has range
- integer
Legend back to ToC
c: Classes
op: Object Properties
dp: Data Properties
op: Object Properties
dp: Data Properties
References back to ToC
- S. Angelis. Semantic Trajectory Analytics and Recommender Systems: Engineering Semantic Trajectories as Knowledge Graphs. Doctoral dissertation, University of the Aegean, 2026.
- G. M. Santipantakis, G. A. Vouros, A. Glenis, C. Doulkeridis, A. Vlachou. The datAcron Ontology for Semantic Trajectories. ESWC 2017 Satellite Events, LNCS 10577, pp. 26-30, Springer, 2017. doi:10.1007/978-3-319-70407-4_6
- A. Gangemi, N. Guarino, C. Masolo, A. Oltramari, L. Schneider. Sweetening Ontologies with DOLCE. EKAW 2002, LNCS 2473, pp. 166-181, Springer, 2002. doi:10.1007/3-540-45810-7_18
- D. Doumanas, G. Bouchouras, A. Soularidis, K. Kotis, G. Vouros. From Human- to LLM-Centered Collaborative Ontology Engineering. Applied Ontology, 2024. doi:10.1177/15705838241305067
Acknowledgments back to ToC
The authors would like to thank Silvio Peroni for developing LODE, a Live OWL Documentation Environment, which is used for representing the Cross Referencing Section of this document and Daniel Garijo for developing Widoco, the program used to create the template used in this documentation.