Applying the LOT methodology to a Public Bus Transport Ontology aligned with Transmodel: Challenges and Results

Tracking #: 2612-3826

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Edna Ruckhaus
Adolfo Antón Braco
Mario Scrocca
Oscar Corcho

Responsible editor: 
Guest Editors Transportation Data 2020

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Ontology Description
We present an ontology that describes the domain of Public Transport by bus, which is common in cities around the world. This ontology is aligned to Transmodel, a reference model which is available as a UML specification and which was developed to foster interoperability of data about transport systems across Europe. The alignment with such a complex non-ontological resource required the adaptation of the Linked Open Terms (LOT) methodology, which has been used by our team as the methodological framework for the development of many ontologies used for the publication of open city data. The ontology is structured into three main modules: (1) agencies, operators and the lines that they manage, (2) lines, routes, stops and journey patterns, and (3) planned vehicle journeys with their timetables and service calendars. Besides reusing Transmodel concepts, the ontology also reuses common ontology design patterns from GeoSPARQL and the SSN ontology. As part of the LOT data-driven validation stage, RDF data has been generated taking as input the GTFS feed provided by the Madrid public bus transport provider (EMT). Data transformation rules were expressed using RML mappings, and materialised, and queries corresponding to competency questions were developed and tested. Currently, a generic and reusable REST API is being developed and it can be adopted by other organizations to standardize the publication of open data in this domain.
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