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7. Internationales
Das Open Search Symposium #ossym25 brachte die Open Search Community zum 7. Mal zusammen.
Das Open Search Symposium #ossym26 findet im Oktober 2026 in Berlin statt. Unser Newsletter hält Sie auf dem Laufenden.
Das #ossym25 setzt die erfolgreiche Konferenzreihe der letzten 6 Jahre fort und bringt 2025 zum siebten Mal die europäische und internationale Open Search Community zusammen.
Das Ziel der interaktiven Konferenz: Ideen und Konzepte einer offenen Internetsuche zu diskutieren und weiterzuentwickeln. Zu den Teilnehmern gehören Forscher, Rechenzentren, Bibliotheken, politische Entscheidungsträger, Rechts- und Ethikexperten und die breite Öffentlichkeit.
Die Anmeldung ist geschlossen.
Conference Information
Discuss interdisciplinary aspects of Open Search
technical • ethical • legal • educational • economic • applications
Keynotes
Henna Virkkunen
Executive Vice-President Tech Sovereignty, Security and Democracy of the European Commission
Aura Salla
Member of the European Parliament
Harri Ketamo
Founder & Chairman, Headai
Viivi Lähteenoja
Chief Executive Officer, The MyData Company
Doctoral Researcher at the University of Helsinki
Science Tracks
Crawling and Infrastructure
Search Applications and Technologies
Preprocessing and ML for Search
LLMs and RAG
Sessions + Workshops
- Ethics + Society
- Legal aspects of open web search & AI-training
- Economic aspects of open web search
Industry Track
„Alternative Search Engines“
fragFINN.de
searchmysite.net
Overview timetable
Day 1 | 8 Oct. 25
08:30 | Opening of Registration
09:00 | Conference Opening
Welcome
Kimmo Koski
Managing Director, CSC IT Center for Science
09:15 | Welcome
Welcome Address (pre-recorded)
Henna Virkkunen
Executive Vice-President for Tech Sovereignty, Security and Democracy of the European Commission
09:30 | Keynote
Opening Keynote
Aura Salla
MEP
10:30 | Coffee Break
11:00 | Science Track
Architecture and Infrastructure I
Session Chair: Jason Theodoropoulos (CSC – IT Center for Science)
11:00 Architecting the Data Storage for the URL Frontier for OpenWebSearch.EU
Noor Afshan Fathima; Andreas Wagner (CERN)
11:20 Extracting and Utilizing Structured Data from the Open Web Index
Laura Caspari; Michael Dinzinger; Michael Granitzer; Jelena Mitrovic (University of Passau)
11:40 Towards the Extraction of Location References and Topics from Semi-Structured Textual Data from the Open Web Index using Open-Source Large Language Models
Patryk Gadziomski; Magnus Pfeffer (HdM Stuttgart); Vanessa Rittlinger; Stefan Voigt (DLR)
12:00 | Lunch Break
13:30 | Applications Track
Retrieval Augmented Generation & Large Language Models
Session Chair: Noor Afshan Fathima (CERN)
13:30 LLM-Assisted Expansion of Patent and Scholarly Literature Knowledge Graphs
Andre Rattinger; Christian Gütl (Graz University of Technology)
13:50 In-Browser Agentic Web: a Decentralized Approach to Information Access
Saber Zerhoudi; Michael Granitzer (University of Passau)
14:10 Assessing the Reliability of Human and LLM-Based Screening in Systematic Reviews: A Study on First-Time Reviewers
Elias Sandner; U. Sharma, Andre Henriques, Uday Sharma, Andreas Wagner (CERN); Ivan Iličić, Christian Gütl (Graz University of Technology), Alice Simniceanu, Luca Fontana (WHO)
14:30 – 15:30 Guided tour at IQM Quantum Computers (optional / parallel to Coffee Break & start of next session)
14:30 | Coffee Break
15:00 | Applications Track
AI Tools in Science
Session Chair: Saber Zerhoudi (University of Passau)
15:00 Automating Systematic Reviews: API-Powered Bibliographic Data Retrieval Module for NeutrinoReview
Elias Sandner; Ivan Iličić (Graz University of Technology); Alice Simniceanu (WHO); Luca Fontana; Andre Henriques; Andreas Wagner (CERN); Christian Gütl (Graz University of Technology)
15:20 Using the Open Web Index to create new search applications for Research.fi
Jason Theodoropoulos; Joonas Kesäniemi (CSC – IT Center for Science)
15:40 Automating License-Aware Full-Text Retrieval for Systematic Reviews: An End-To-End Scalable System to Reduce Reviewer Workload
Dmytro Zhuk (University of Vienna); Elias Sandner; Igor Jakovljevic; Andre Henriques; Andreas Wagner (CERN); Christian Gütl (Graz University of Technology), Alice Simniceanu, Luca Fontana (WHO)
16:00 | Workshop on Information Literacy
Melanie Platz (University of Saarland); Carolin Bauer (Open Search Foundation)
17:00 | Closing of Day 1
17:15 | Evening reception at CSC
20:00 | Optional afterwork meet-up (self-hosted)
Day 2 | 9 Oct. 25
9:00 | Science Track
Architecture & Infrastructure II
Session chair: Sebastian Heineking (University of Leipzig & WEBIS Group)
09:00 Large-Scale Graph Visualisation of Open Web Index and its Evolution in Time
Kateřina Slaninová; Pavlína Smolková (VSB – Technical University of Ostrava)
09:20 Expanding the Language and Cultural Coverage of Common Crawl
Pedro Ortiz Suarez; Greg Lindahl; Thom Vaughan; Sebastian Nagel (Common Crawl Foundation)
09:40 Efficient Session Search using Topical Index Shards
Gijs Hendriksen; Djoerd Hiemstra; Arjen P. de Vries (Radboud University, Nijmegen, The Netherlands)
10:00 A Practical Guide to LLM Finetuning on LUMI Using Data From The Open Web Index
Emma Hintsala (CSC – IT Center for Science)
10:20 | Coffee Break
11:00 | Keynote
„The openness of knowledge data and its role in Future Search Solutions“
Harri Ketamo
Founder & Chairman Headai
12:00 – 13:00 | Introducing LUMI AI Factory (optional / parallel to lunch break)
12:00 | Lunch Break
14:00 | Applications Track
Retrieval Augmented Generation & Large Language Models
Session chair: Gijs Hendriksen (Radboud University)
14:00 Scientific Question Answering using Hybrid Retrieval Augmented Generation
Tobias Hecking; Roxanne el Baff (German Aerospace Center – DLR)
14:20 Adding Retrieval Augmented Generation to the MOSAIC Framework
Sebastian Gürtl; Felix Holz; Alexander Nussbaumer; Daniel Scharf (Graz University of Technology)
14:40 Fusion of retrieval, grammar rules and decision trees for text generation
Walter Kühn; Svenja Müller; Engelbert Niehaus (RPTU)
15:00 Large models for small languages
Sampo Pyysalo (OpenEuroLLM)
15:15 Curation and preprocessing of training data for open European language models
Markus Koskela; Maciej Janicki (OpenEuroLLM)
15.30 | Coffee Break
16:00 | Legal Session
Adressing legal challenges in Open Web Search
Session chair: Kai Erenli (University of Applied Sciences BFI Vienna)
16:00 Legal challenges for the Open Web Index and Search Engine Use
Paul Christopher Johannes; Huda Koulani (University of Kassel)
16:20 Legal Aspects of AI training and Retrieval Augmented Generation
Charlotte Werther (Open Search Foundation); Paul Christopher Johannes (University of Kassel)
16:40 | Social Science Track
Ethics & Society I
Session chair: Roxanne El Baff (Bauhaus University Weimar, German Aerospace Center – DLR)
16:40 Knowledge Sovereignty in Disability Information Retrieval: Architecting Privacy-Preserving and Sustainable Infrastructure
Noor Afshan Fathima; Andreas Wagner (CERN)
17:00 Building the Open Web Search Community (And Keeping It Growing)
Ursula Gmelch (Open Search Foundation)
17:20 | Closing of Day 2
19:30 | Socialising Event – Allas Restaurants, Helsinki
Sauna and swimming available at Allas Sea Pool
Day 3 | 10 Oct. 25
9:00 | Keynote
„Searching for Trust: Reflections on Epistemic Virtue Online“
Viivi Lähteenoja
Chief Executive Officer, The MyData Company & Doctoral Researcher at the University of Helsinki
10:00 | Coffee Break
10:30 | Industry Track
Alternative Search Engines
Session Chair: Elias Sandner (CERN)
10:30 The children’s search engine fragFINN – best practice for a safe start online
Tanja Gottsmann; Maria Wiesner; Nadine Berneis; FragFINN.de
10:50 The economics of running an independent search engine
Michael I Lewis, Owner & Operator searchmysite.net
11:10 | Science Track
Ethics & Society II
Session Chair: Ines Zelch (University of Leipzig)
11:10 Exploring Technoscience in the Public Sphere: Opportunities through Open Web Search
Emanuele Di Buccio (University of Padova)
11:30 The Project KIsu: AI-based searching and finding – easy, inclusive, and self-determined
Melanie Platz; Kristin Altmeyer; Mirella Hladky; Kerstin Reese; Lisa Schick; Verena Wolf (University of Saarland); Christine Plote (Open Search Foundation); Tanja Gottsmann; Maria Wiesner (FragFINN)
11:50 A manifesto for public interest Internet Search
Alexander Nussbaumer (Graz University of Technology); Christine Plote (Open Search Foundation)
12:10 | Closing of #ossym25 & Wrap-Up
12:30 | Lunch
13:30 | End of Symposium
For any changes in the program please check back regularly on the conference website. Or sign-up for our newsletter to stay up to date.
Venue
Life Science Center Keilaniemi
Espoo (Helsinki), Finland
Address
CSC – IT Center for Science Ltd.
Life Science Center Keilaniemi
Keilaranta 14
02150 Espoo
Hotels nearby
Heymo1 Sokos Hotels (€€)
Hotels in Helsinki city with good connections
Lapland Hotels Bulevardi (€€€)
Klaus K Hotel (€€)
How to get there
The Life Science Center Keilaniemi is located in Espoo which is about 10 km distance from Helsinki Central Station / city center. The distance from Helsinki-Vantaa airport is approximately 20 kilometres.
From the airport
- by Taxi (approx. 30 min.)
- by public transport (approx. 1:10h min.) – take a lokal train or bus from the airport. You need to change at least one time. Varius connections are possible. Please use the Helsinki public transports website to plan you route.
From Helsinki Central Station
Metro line M1 (direction: Kivenlahti) or M2 (direction: Tapiola) – get off at “Keilaniemi”.
Exit the metro station by the exit A (“Keilaniementie”) which is the most convenient one of the two exits.
Taxi Information
- from the airport to the venue: approx. 30 min.; 30-45 Euro
- from the city centre to the venue: approx. 15 min.; 15-20 Euro
Airport taxi (fixed prices)
Taxi dispatch center (Prices may vary between operators and depending on the current demand of taxis)
You can also use apps such as Uber and Bolt to book your taxi ride.
Speaker Info
Henna Virkkunen
European Commission
Executive Vice-President Tech Sovereignty, Security and Democracy
10 October | Welcome Address (pre-recorded) | 9.15 am
As Executive Vice-President for Tech Sovereignty, Security and Democracy, Henna Virkkunen is tasked with combatting the increasingly complex security threats facing the EU, whilst at the same time strengthening our external borders and our internal security. This goes hand in hand with her responsibility to ensure our freedoms, justice and democracy are strengthened too.
Furthermore, she is responsible for the Digital and Frontier Technologies portfolio. This entails leading Europe’s efforts in shaping a competitive, resilient and inclusive digital future and maintaining or attaining leadership in strategic digital technologies.
Prior to joining the European Commission Ms Virkkunen served as a Member of the European Parliament for over ten years. As a Member of the Committee on Industry, Research and Energy her work focused on digitalisation and frontier technologies.
Henna Virkkunen has held various ministerial positions in Finland, namely Minister of Transport and Local Government (2014), Minister of Public Administration and Local Government (2011-2014) as well as Minister of Education (2008-2011).
Aura Salla
Member of the European Parliament
8 October | Opening Keynote | 09:30 am
Aura Salla is a Finnish politician and EU expert currently serving as a Member of the European Parliament. With a PhD in political science and a background in high-level EU policy roles, she brings deep insight into European governance and digital affairs. Her career spans advisory positions in the European Commission and active roles in Finnish politics. Aura is known for her pragmatic approach to policy and her commitment to building a strong, united Europe.
Photographer: Ahu Yigit
Harri Ketamo
Founder & Chairman
Headai
9 October | Keynote – The openness of knowledge data and its role in Future Search Solutions | 11.00 am
Dr. Harri Ketamo is an entrepreneur and researcher with over 20 years of experience in cognitive sciences, artificial intelligence, and learning technologies. He is the founder and chairman of Headai, a company pioneering semantic AI for transparent decision-making. Harri is an Eisenhower Fellow and serves as an Adjunct Professor at Tampere University of Technology and Senior Fellow at the University of Turku. His work bridges science and business, focusing on data openness and sustainable innovation.
Viivi Lähteenoja
CEO The MyData Company
Doctoral Researcher at the University of Helsinki
10 October | Keynote – Searching for Trust: Reflections on Epistemic Virtue Online | 9.00 am
Viivi Lähteenoja is a professional, researcher, and advocate in the field of data strategy, policy, and ethics. She works to promote the human-centered and ethically sustainable use of personal data in order to improve the well-being of people and societies. Viivi is the chair of the board of the award-winning international organization MyData Global and the CEO of MyData Company. The association’s purpose is to promote fair, sustainable, and prosperous societies through human-centered personal data.
She is also a doctoral researcher at the University of Helsinki and a visiting researcher at Aalto University, where her research focuses on philosophical ethics and the (mis)use of personal data.
Henna Virkkunen
European Commission
Executive Vice-President Tech Sovereignty, Security and Democracy
10 October | Welcome Address | 9.15 am
As Executive Vice-President for Tech Sovereignty, Security and Democracy, Henna Virkkunen is tasked with combatting the increasingly complex security threats facing the EU, whilst at the same time strengthening our external borders and our internal security. This goes hand in hand with her responsibility to ensure our freedoms, justice and democracy are strengthened too.
Furthermore, she is responsible for the Digital and Frontier Technologies portfolio. This entails leading Europe’s efforts in shaping a competitive, resilient and inclusive digital future and maintaining or attaining leadership in strategic digital technologies.
Prior to joining the European Commission Ms Virkkunen served as a Member of the European Parliament for over ten years. As a Member of the Committee on Industry, Research and Energy her work focused on digitalisation and frontier technologies.
Henna Virkkunen has held various ministerial positions in Finland, namely Minister of Transport and Local Government (2014), Minister of Public Administration and Local Government (2011-2014) as well as Minister of Education (2008-2011).
Aura Salla
Member of the European Parliament
8 October | Opening Keynote | 09:30 am
Aura Salla is a Finnish politician and EU expert currently serving as a Member of the European Parliament. With a PhD in political science and a background in high-level EU policy roles, she brings deep insight into European governance and digital affairs. Her career spans advisory positions in the European Commission and active roles in Finnish politics. Aura is known for her pragmatic approach to policy and her commitment to building a strong, united Europe.
Photographer: Ahu Yigit
Harri Ketamo
Founder & Chairman
Headai
9 October | Keynote – The openness of knowledge data and its role in Future Search Solutions | 11.00 am
Dr. Harri Ketamo is an entrepreneur and researcher with over 20 years of experience in cognitive sciences, artificial intelligence, and learning technologies. He is the founder and chairman of Headai, a company pioneering semantic AI for transparent decision-making. Harri is an Eisenhower Fellow and serves as an Adjunct Professor at Tampere University of Technology and Senior Fellow at the University of Turku. His work bridges science and business, focusing on data openness and sustainable innovation.
Viivi Lähteenoja
CEO The MyData Company
Doctoral Researcher at the University of Helsinki
10 October | Keynote – Searching for Trust: Reflections on Epistemic Virtue Online | 9.00 am
Viivi Lähteenoja is a professional, researcher, and advocate in the field of data strategy, policy, and ethics. She works to promote the human-centered and ethically sustainable use of personal data in order to improve the well-being of people and societies. Viivi is the chair of the board of the award-winning international organization MyData Global and the CEO of MyData Company. The association’s purpose is to promote fair, sustainable, and prosperous societies through human-centered personal data.
She is also a doctoral researcher at the University of Helsinki and a visiting researcher at Aalto University, where her research focuses on philosophical ethics and the (mis)use of personal data.
Conference Facts – Overview
Important Dates
Submission deadline of full papers and extended abstracts
17 March 2025
Information about contribution acceptance
1 June 2025
Registration for the #ossym25
Open since 15 June 2025
International Open Search Symposium #ossym25
8-10 October 2025
Online publication of proceedings
Autumn 2025
Conference fee
A conference fee applies for #ossym25
regular: 200,00€ I reduced: 60,00€ (students, freelance developers and on special request)
How does the payment procedure work?
Fees will be collected upon registration via Indico/bank transfer (starting June 15th)
Whom to contact if I have special request regarding the fee?
Is there a fee for online participation?
No, online participation is free of charge
Main Topics
Discuss interdisciplinary aspects of Open Search
technical • ethical • legal • educational • economic • applications
Topics of #ossym25 include but are not limited to
- Open search architectures and platforms
- Open Web Index and application domains
- Federated search and cross-domain search
- Web Data Analytics and Web Mining
- Natural language and multi-media processing for search
- Large Language Models, Machine learning and generative AI
- AI-based search and Retrieval Augmented Generation
- Personalization and recommendation in search
- Conversational Retrieval Experiences
- Georeferencing of web content and geospatial search and analysis
- Evaluation of open search systems
- Applications of open search in domains such as science, e-commerce, health, and education
- Search bias and trust
- Economic dimensions of open search
- Search engine advertising and business models in an open search world
- Green computing and sustainability
- Societal and ethical challenges and solutions
- Ethical and value aspects of search
- Politics and governance
- Legal aspects
The registration for #ossym25 opens June, 15th 2025. The conference programme will be published from spring 2025. To stay up to date, subscribe to the free osf newsletter.
Call for Papers
We are calling for your contribution with scientific papers, sharing of practical experiences or by introducing concepts and positions in relevant fields, such as computer science, legal, economics and ethics. Full papers and abstracts presented at the #ossym25 will be published open access in online proceedings (including DOIs and ISBN) following the event.
Please submit your contribution: for research contributions we accept full papers (4-6 pages) and for any other contribution (concepts, best practices or practitioners’ experiences) an extended abstract (1 page).
All abstracts and papers have to be submitted via https://indico.cern.ch/e/OSSYM-2025 using the templates specified there. The acceptance of all full papers and extended abstracts is subject of a peer-review process.
Call for Demos
We invite young researchers and students to showcase their innovative work using the Open Web Index of the OpenWebSearch.eu project. This call is an excellent opportunity for participants to develop and present innovative search and web analytics solutions to advance to a more open search ecosystem and show them to the open search community. We are particularly interested in demonstrations that combine the Open Web Index with technologies such as Large Language Models, Knowledge Graphs, or that offer new search paradigms (e.g. Argumentation Search, Conversational Search), interesting frontends, and domain-specific search solutions. In addition, we are also looking for contributions towards web-scale, robust semantic enrichment techniques that can advance search solutions for different domains. Examples could be information quality assessments, entity extraction or Knowledge Graph alignment.
All demos have to be submitted via https://indico.cern.ch/e/OSSYM-2025 using the templates specified there. The acceptance of all demos is subject of a peer-review process.
Registration
You can register for the conference – for on-site and online participation – via the system of our conference partner CSC. Please note that the participation fee will be charged during the registration process.
Organisers & Programme Committee
Organising Committee
Conference Chairs
Prof. Dr. Michael Granitzer | University Passau, Germany
Prof. Dr. Christian Guetl | Graz University of Technology, Austria
Dr. Megi Sharikadze | Leibniz Supercomputing Centre, Munich, Germany
Dr. Stefan Voigt | Open Search Foundation, Starnberg, Germany
Dr. Andreas Wagner | CERN, Geneva, Switzerland
Local Chairs and Organization
Per Öster, PhD | CSC – IT Center for Science, Finland
Publication Chairs
Sebastian Guertl | Graz University of Technology, Austria
Elias Sandner | CERN, Geneva, Switzerland
Dr. Andreas Wagner | CERN, Geneva, Switzerland
Poster Session Chairs
Iiris Liinamaa | CSC – IT Center for Science, Finland
Heidi Laine | CSC – IT Center for Science, Finland
Programme Committee
Dr. Alexander Decker | Technische Hochschule Ingolstadt, Germany
Prof. Dr. Arjen P. de Vries | Radboud University, Netherlands
Prof. Dr. Kai Erenli | University of Applied Sciences BFI Vienna, Austria
Msc. Maik Fröbe | Friedrich-Schiller-Universität, Jena, Germany
Priv.-Doz Dr. Christian Geminn | University Kassel, Germany
Prof. Dr. Michael Granitzer | University Passau, Germany
Prof. Dr. Christian Guetl | Graz University of Technology, Austria
Prof. Dr. Matthias Hagen | Friedrich-Schiller-Universität, Jena, Germany
Prof. Dr. Denis Helic | Graz University of Technology, Austria
Msc. Gijs Hendriksen | Radboud University, Netherlands
Prof. Dr. Andreas Henrich | University Bamberg, Germany
Prof. Djoerd Hiemstra | University of Twente, Radboud University, Netherlands
Msc. Phil Höfer | SUMA e.V., Germany
Prof. Dr. Robert Jäschke | Humboldt University Berlin & L3S, Hannover, Germany
Prof. Dr. Dieter Kanzlmüller | Ludwigs-Maximilians-University & Leibniz Rechenzentrum, Munich, Germany
Dr. Jens Kersten | German Aerospace Centre, Jena, Germany
Prof. Dr. Elisabeth Lex | Graz University of Technology, Austria
Dr. Jelena Mitrovic | University of Passau, Germany
Prof. Dr. Engelbert Niehaus | University Koblenz-Landau, Landau, Germany
Prof. Dr. Monica Palmirani | Università di Bologna, Italy
Dr. Jakub Piskorski | Joint Research Center (JRC), Ispra, Italy
Prof. Dr. Melanie Platz | Saarland University, Germany
Prof. Dr. Martin Potthast | Leipzig University, Germany
Prof. Dr. Mirko Presser | Aarhus University, Denmark
Prof. Dr. Georg Rehm | German Research Center for Artificial Intelligence (DFKI), Berlin, Germany
Dr. Renée Ridgway | Aarhus University, Denmark
Dr. Tim Smith | CERN, Geneva, Switzerland
Dr. Stefan Voigt | Open Search Foundation, Germany
Dr. Andreas Wagner | CERN, Geneva, Switzerland
Prof. Patrick Weiss | Technische Hochschule Ingolstad, Germany