The Seminar on Ontology Research in Brazil (ONTOBRAS) is a consolidated forum for researchers and professionals to share theoretical, methodological, and practical advances in ontology development and application. Since 2005, ONTOBRAS has been recognized as the main scientific event in Brazil dedicated to ontologies and their use across various domains.

The 2025 edition will explore the theme: “The Influence of Ontologies in Generative AI.”
This topic is of high relevance to both academia and industry, as ontologies and knowledge graphs have shown great potential to improve the quality of responses from generative AI systems. The event aims to promote dialogue and cooperation between researchers and practitioners, fostering partnerships and innovation.

📅 September 29th – October 2nd, 2025
📍 Aeronautics Institute of Technology (ITA) and Faculty of Medical Sciences Humanitas, São José dos Campos, SP – Brazil
🔗 Submission system: https://easychair.org/conferences/?conf=ontobras2025
👉 ONTOBRAS 2025 will be held fully in person. All accepted papers must be presented onsite in São José dos Campos, SP.

Important Dates:
* Submission Deadline: June 22nd, 2025
* Author Notification: July 31st, 2025
* Camera-Ready Version: August 22nd, 2025
* Authors’ Registration Deadline: August 29th, 2025

Topics of Interest:
Submissions may address, but are not limited to, the following topics:
* Ontology Engineering: Methods, languages, tools, patterns, modularity, evaluation, alignment, reuse, and enrichment.
* Ontologies and Conceptual Modeling: Foundational ontologies, semantic consistency, modeling tools, and metamodeling.
* Knowledge Organization and Representation: Taxonomies, thesauri, metadata, facet theory, conceptual structures, reasoning, and governance.
* Semantic Web and NLP: Linked data, virtual knowledge graphs, information retrieval, linguistic ontologies, and computational linguistics.
* Applications of Ontologies: Use in education, health, e-science, smart cities, government, business modeling, AI, machine learning, and FAIR data.

More Topics, please visit at https://www.inf.ufrgs.br/ontobras/en/call-for-papers-ontobras-2025/

Submission Guidelines:
* Papers must be original and not under review elsewhere.
* Languages accepted: English (preferred), Portuguese, or Spanish. If written in Portuguese or Spanish, the submission must include an abstract and keywords in English.
* All submissions will undergo peer review by experts in the field.
* Double-blind review: Authors must omit names, affiliations, and self-identifying references.
* Submissions must be in PDF format and follow the CEUR-ART single-column template, available at: http://ceur-ws.org/Vol-XXX/CEURART.zip or overleaf version: https://www.overleaf.com/latex/templates/template-for-submissions-to-ceur-workshop-proceedings-ceur-ws-dot-org/hpvjjzhjxzjk

Types of Papers:
* Full papers (up to 12 pages): Mature research contributions, including advanced student work with substantial results.
* Short papers (up to 6 pages): Early-stage research, partial results, or conceptual discussions.
* Authors must indicate the submission type and include this information as a footnote on the first page.

Publication and Presentation: Accepted papers will be published in the CEUR-WS proceedings, under the IAOA series.
At least one author must register and present the paper in person at the event.

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ONTOBRAS 2025 Organization:

General Chairs
José M. Parente de Oliveira, Aeronautics Institute of Technology

Program Chairs
Fernanda Farinelli, University of Brasília
Joel Luís Carbonera, Federal University of Rio Grande do Sul

WTDO Chairs
Amanda Damasceno de Souza, FUMEC University
Fabrício Henrique Rodrigues, Federal University of Rio Grande do Sul / Samsung

Communication Chairs
Evellin Cristine Souza Cardoso, Federal University of Goiás
Rafael Logan de Souza Nobre, Federal University of Paraná

Web Chairs
Haroldo Rojas de Souza Silva, Federal University of Rio Grande do Sul
Rafael Humann Petry, Federal University of Rio Grande do Sul

Hosted by
ONTOBRAS 2025 is hosted by the Aeronautics Institute of Technology and the Faculty of Medical Sciences Humanitas, in São José dos Campos, SP, Brazil.