Trajecto Purpose Module
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Trajecto Purpose Module

Release: 2025-05-09

Modified on: 2026-10-01
This version:
http://w3id.org/trajecto/purpose/1.1.0
Latest version:
http://w3id.org/trajecto/purpose
Previous version:
http://w3id.org/trajecto/purpose/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:
purpose/skos
Source:
https://github.com/sotirisAng/trajecto-stakg/blob/main/ontology/modules/purpose.ttl
Download serialization:
JSON-LD RDF/XML N-Triples TTL
License:
https://creativecommons.org/publicdomain/zero/1.0/ License
Visualization:
Visualize with WebVowl
Cite as:
Angelis, S. (2026). Semantic Trajectory Analytics and Recommender Systems: Engineering Semantic Trajectories as Knowledge Graphs. Doctoral dissertation, University of the Aegean.
Provenance of this page
Ontology Specification

Abstract

This module extends the trajecto ontology with a comprehensive framework for representing purposes of movement.

Introduction back to ToC

Source: https://github.com/sotirisAng/trajecto-stakg/blob/main/ontology/modules/purpose.ttl. The whole ontology is documented from http://w3id.org/trajecto (the core module), which imports every module.

Namespace declarations

Table 1: Namespaces used in the document
datacron<http://www.datacron-project.eu/datAcron#>
dcterms<http://purl.org/dc/terms/>
dul<http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#>
owl<http://www.w3.org/2002/07/owl#>
purpose<http://w3id.org/trajecto/purpose#>
rdf<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
rdfs<http://www.w3.org/2000/01/rdf-schema#>
skos<http://www.w3.org/2004/02/skos/core#>
trajecto<http://w3id.org/trajecto#>
vann<http://purl.org/vocab/vann/>
xml<http://www.w3.org/XML/1998/namespace>
xsd<http://www.w3.org/2001/XMLSchema#>

trajecto-purpose: Overview back to ToC

This ontology has the following classes and properties.

Classes

Object Properties

Data Properties

trajecto-purpose: Description back to ToC

This module extends the trajecto ontology with a comprehensive framework for representing purposes of movement.

Cross-reference for trajecto-purpose classes, object properties and data properties back to ToC

This section provides details for each class and property defined by trajecto-purpose.

Classes

Artistic Experiencec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#ArtisticExperience

Purpose related to experiencing artistic works or performances.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c
has sub-classes
Fine Arts Purpose c, Photography Purpose c, Print Purpose c, Sculpture Purpose c

Business Meetingc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#BusinessMeeting

Purpose related to professional business meetings.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Work Purpose c

Commercial Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#CommercialPurpose

Movement purpose related to commercial activities such as shopping or services.
Movement motivated by purchase, consumption or service-seeking activities.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Shopping, dining out, visiting a bank
has super-classes
Purpose Category c
has sub-classes
Dining Experience c, Service Access c, Shopping c

Commutingc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Commuting

Purpose related to regular travel between home and work/education.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Transportation Purpose c

Cultural Event Attendancec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#CulturalEventAttendance

Purpose related to attending cultural events, festivals, or performances.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c

Cultural Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#CulturalPurpose

Movement purpose related to cultural activities and experiences.
Movement motivated by engagement with cultural artifacts, spaces, or events.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Museum visits, attending performances, exploring heritage sites
has super-classes
Purpose Category c
has sub-classes
Artistic Experience c, Cultural Event Attendance c, Educational Tour c, General Purpose c, Heritage Exploration c, Museum Visit c

Dining Experiencec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#DiningExperience

Purpose related to dining at restaurants or food establishments.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Commercial Purpose c

Domestic Activityc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#DomesticActivity

Purpose related to household or domestic activities.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Residential Purpose c

Educational Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#EducationalPurpose

Movement purpose related to learning and educational activities.
Movement motivated by formal or informal learning objectives.
Is defined by
http://w3id.org/trajecto/purpose
Example 
School attendance, workshops, field studies, research activities
has super-classes
Purpose Category c
has sub-classes
Educational Tour c, Field Study c, Formal Learning c, Research c, Workshop Attendance c

Educational Tourc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#EducationalTour

Purpose that combines cultural experience with educational objectives.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c, Educational Purpose c

Entertainment Attendancec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#EntertainmentAttendance

Purpose related to attending entertainment events (cinema, sports, etc.).
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Recreational Purpose c

Exercise Activityc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#ExerciseActivity

Purpose related to physical exercise or sports activities.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Recreational Purpose c

Field Studyc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#FieldStudy

Purpose related to educational field studies or site visits.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Educational Purpose c

Field Workc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#FieldWork

Purpose related to professional work conducted in the field.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Work Purpose c

Fine Arts Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#FineArtsPurpose

Purpose related to engagement with paintings, mixed media, mirrors, and installations.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Artistic Experience c

Formal Learningc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#FormalLearning

Purpose related to formal educational activities (classes, lectures).
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Educational Purpose c

General Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#GeneralPurpose

Mixed cultural engagement with no dominant artwork type.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c

Heritage Explorationc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#HeritageExploration

Purpose related to exploring heritage sites or historical locations.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c

Home Boundc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#HomeBound

Purpose related to returning to or staying at home.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Residential Purpose c

Leisure Activityc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#LeisureActivity

Purpose related to casual leisure activities.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Recreational Purpose c

Local Community Engagementc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#LocalCommunityEngagement

Purpose related to engaging with the local community near one's residence.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Residential Purpose c

Museum Visitc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#MuseumVisit

Purpose related to visiting museums or exhibitions.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Cultural Purpose c

Office Workc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#OfficeWork

Purpose related to working in an office environment.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Work Purpose c

Photography Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#PhotographyPurpose

Purpose related to engagement with photographic works.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Artistic Experience c

Print Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#PrintPurpose

Purpose related to engagement with prints and printmaking works.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Artistic Experience c

Professional Eventc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#ProfessionalEvent

Purpose related to attending professional events, conferences, or trade shows.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Work Purpose c

Purpose Categoryc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#PurposeCategory

A general category of movement purpose.
A classification of movement purpose into general categories that can be hierarchically organized.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Purpose Of Movement c
has sub-classes
Commercial Purpose c, Cultural Purpose c, Educational Purpose c, Recreational Purpose c, Residential Purpose c, Transportation Purpose c, Work Purpose c
is in domain of
has purpose characteristic op, has purpose duration dp, has purpose frequency dp, has purpose priority dp
is in range of
from purpose op, has opportunistic purpose op, has primary purpose op, has secondary purpose op, to purpose op

Purpose Hierarchyc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#PurposeHierarchy

A structure representing the hierarchical organization of movement purposes.
A construct that represents the organization of primary, secondary, and opportunistic purposes that motivate a trajectory.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Abstract c
is in range of
has purpose hierarchy op

Purpose Transitionc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#PurposeTransition

Represents a change from one purpose to another during a trajectory.
An event where the primary motivation for movement changes from one purpose to another.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Event c
is in domain of
from purpose op, to purpose op, transition timestamp dp
is in range of
has purpose transition op

Recreational Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#RecreationalPurpose

Movement purpose related to leisure and recreational activities.
Movement motivated by leisure, entertainment, relaxation, or pleasure.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Park visits, beach trips, attending sporting events
has super-classes
Purpose Category c
has sub-classes
Entertainment Attendance c, Exercise Activity c, Leisure Activity c, Social Gathering c, Tourism c

Researchc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Research

Purpose related to research activities.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Educational Purpose c

Residential Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#ResidentialPurpose

Movement purpose related to residential and home-based activities.
Movement motivated by home-related activities or local community engagement.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Returning home, local neighborhood activities
has super-classes
Purpose Category c
has sub-classes
Domestic Activity c, Home Bound c, Local Community Engagement c

Sculpture Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#SculpturePurpose

Purpose related to engagement with sculptural works.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Artistic Experience c

Service Accessc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#ServiceAccess

Purpose related to accessing commercial services (banking, healthcare, etc.).
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Commercial Purpose c

Shoppingc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Shopping

Purpose related to purchasing goods.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Commercial Purpose c

Social Gatheringc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#SocialGathering

Purpose related to meeting and socializing with others.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Recreational Purpose c

Tourismc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Tourism

Purpose related to visiting places as a tourist.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Recreational Purpose c

Transfer Between Modesc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#TransferBetweenModes

Purpose related to transferring between different modes of transportation.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Transportation Purpose c

Transitc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Transit

Purpose primarily focused on moving from one location to another.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Transportation Purpose c

Transportation Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#TransportationPurpose

Movement purpose primarily related to transport and transit between locations.
Movement motivated primarily by the need to travel between locations rather than activities at those locations.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Commuting, transit transfers, wandering
has super-classes
Purpose Category c
has sub-classes
Commuting c, Transfer Between Modes c, Transit c, Wandering c

Wanderingc back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#Wandering

Purpose involving movement without a specific destination or goal.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Transportation Purpose c

Work Purposec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#WorkPurpose

Movement purpose related to employment and professional activities.
Movement motivated by professional responsibilities or employment-related activities.
Is defined by
http://w3id.org/trajecto/purpose
Example 
Office work, field work, business meetings
has super-classes
Purpose Category c
has sub-classes
Business Meeting c, Field Work c, Office Work c, Professional Event c, Workplace Routine c

Workplace Routinec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#WorkplaceRoutine

Purpose related to regular workplace routines and activities.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Work Purpose c

Workshop Attendancec back to ToC or Class ToC

IRI: http://w3id.org/trajecto/purpose#WorkshopAttendance

Purpose related to attending workshops, seminars, or training sessions.
Is defined by
http://w3id.org/trajecto/purpose
has super-classes
Educational Purpose c

Object Properties

from purposeop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#fromPurpose

Specifies the original purpose before a transition.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Transition c
has range
Purpose Category c

has opportunistic purposeop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasOpportunisticPurpose

Specifies unplanned purposes that emerge during the trajectory.
Spontaneous or unplanned purposes that arise during the trajectory and influence movement patterns.
Is defined by
http://w3id.org/trajecto/purpose
has super-properties
has Purpose op
has domain
Trajectory c
has range
Purpose Category c

has primary purposeop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPrimaryPurpose

Specifies the main purpose of a trajectory.
The primary motivation or goal behind the movement represented by the trajectory.
Is defined by
http://w3id.org/trajecto/purpose
has super-properties
has Purpose op
has domain
Trajectory c
has range
Purpose Category c

has purpose characteristicop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeCharacteristic

Links a purpose category to its characteristic properties.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Category c

has purpose hierarchyop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeHierarchy

Links a trajectory to its complete purpose hierarchy.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Trajectory c
has range
Purpose Hierarchy c

has purpose transitionop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeTransition

Links a trajectory to purpose transitions that occur within it.
Identifies changes in movement purpose that occur during a trajectory.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Trajectory c
has range
Purpose Transition c

has secondary purposeop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#hasSecondaryPurpose

Specifies additional purposes of a trajectory that are not the main driver of movement.
Additional goals or aims that may be fulfilled during the trajectory, but are not the primary motivation for the movement.
Is defined by
http://w3id.org/trajecto/purpose
has super-properties
has Purpose op
has domain
Trajectory c
has range
Purpose Category c

to purposeop back to ToC or Object Property ToC

IRI: http://w3id.org/trajecto/purpose#toPurpose

Specifies the new purpose after a transition.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Transition c
has range
Purpose Category c

Data Properties

has purpose confidence scoredp back to ToC or Data Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeConfidenceScore

Share of the meaningful dwell of a trajectory spent at POIs of its assigned purpose, as a percentage (0 to 100).
Is defined by
http://w3id.org/trajecto/purpose
has domain
Trajectory c
has range
decimal

has purpose durationdp back to ToC or Data Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeDuration

Specifies the typical duration associated with a purpose.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Category c
has range
duration

has purpose frequencydp back to ToC or Data Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposeFrequency

Describes how frequently this purpose typically occurs (e.g., 'daily', 'weekly', 'monthly', 'rarely').
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Category c
has range
string

has purpose prioritydp back to ToC or Data Property ToC

IRI: http://w3id.org/trajecto/purpose#hasPurposePriority

Numeric representation of purpose priority, with lower numbers indicating higher priority.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Category c
has range
integer

transition timestampdp back to ToC or Data Property ToC

IRI: http://w3id.org/trajecto/purpose#transitionTimestamp

Timestamp when the purpose transition occurred.
Is defined by
http://w3id.org/trajecto/purpose
has domain
Purpose Transition c
has range
date Time

Legend back to ToC

c: Classes
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.