ReasonableGraph

The Platform

We offer an advanced, open-source platform that transforms static collections into dynamic, interconnected knowledge graphs. A perfect fit for libraries, archives, and research communities, RG breaks down data silos through secure collaborative environments (with absolute responsibility retention) and leverages AI-assisted discovery to turn heritage into living, shared knowledge.

From Data to Interconnected Knowledge ReasonableGraph natively manages data as a semantic graph, empowering institutions to structure their collections as Linked Open Data. By natively supporting complex standard-based ontologies—such as FRBR/IFLA LRM, BIBFRAME, FRBRoo, CIDOC-CRM, and EAD/ISAD—RG allows for highly expressive, multi-layered descriptions of your historical, musical, and archival assets.

Core Innovations & Features

All in One Single Installation & Absolute Autonomy

Manage joint projects, federated networks, and multiple local repositories under one unified digital infrastructure. Yet, every participating institution, community, or researcher maintains complete autonomy: you control your own data, define your own access policies, build your own custom cataloguing forms, and even create your own distinct microsite. You decide what is shared with the central network and what remains private.

Connecting Heterogeneous Data & Multiple Entities

Break down information silos and “unite the fragments of knowledge”. RG’s semantic graph seamlessly interlinks highly heterogeneous data (from manuscripts, rare books, and documents to oral histories, sound recordings, and photographs). The system dynamically maps and connects multiple entities (persons, families, organizations, places, concepts, and events) across diverse scientific fields, including Digital Humanities, History, Anthropology, Sociology, and Law.

Responsibility Retention & Access Management

Foster true collaborative research by offering advanced functions for managing access rights to metadata and digital files (records/assets). Our system guarantees an indelible trail of provenance—recording exactly who contributed what. Through “Extension Nodes”, external researchers can add analysis and metadata to existing entities without altering the original data, ensuring no data merging happens without your explicit consent.

Interoperability & Linked Open Data

Ensure your data aligns with FAIR principles. Import metadata easily via Z39.50 or Wikidata, and export in standard formats (RDF/XML, JSON-LD, EDM, DC) for seamless integration with platforms like Europeana. RG operates natively as a Semantic & Linked Open Data environment.

AAA Accessibility

Fully accessible web interfaces designed to meet the highest WCAG AAA standards, ensuring accessibility for all users.

Implementations

Trusted by leading institutions explore how universities, academies, municipalities, and cultural networks leverage ReasonableGraph to safeguard, interconnect, and showcase their heritage.

Current Implementations

Digital Repositories of the Academy of Athens

Browse the archival materials of the Research Centers of the Academy of Athens

Digital Library Research Centers Repos

Lekythos - University of Cyprus Library

Lekythos is the digital collections repository of the University of Cyprus Library that provides access to digitized material covering various subject areas such as Archaeology, Architecture, Library and Information Science, History, Political Science, and Literature.

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MELOS - Greek Music Audiovisual Collections

Music Ontology and Collaborative Catalogue of the Music Collections of the University of Macedonia, the University of Ioannina, and the Music Library of Greece "Lilian Voudouri" of the Friends of Music Society.

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Hellenic Open University

Apothesis Repository is an institutional open access archive which includes material related to the research and academic activities of the Hellenic Open University.

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Digital History and Culture Repository of Saronikos Municipality

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UNIC Institutional Repository

UNIC Repository is an institutional open access archive which includes material related to the research and academic activities of the University of Nicosia.

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Public Central Library Typaldou-Iakovatou Museum of Lixouri

Library Typaldou-Iakovatou Museum of Lixouri, Kefalonias

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Digital Repository of Chalkida Municipality Library

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Greek Modern History Repository - Aselis

An online digital archive focusing on political, historical and societal publications regarding Greek Civil War (1946-1949) and the 1940-1949 decade. Implemented on ontology based on the FRBR-FRAD-FRSAD semantic models.

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AMELib

An Accessible Multi-modal Electronic Library. Amelib network hosts all the Academic libraries of Greece, tha National Library of Greece and organisations for the visually impaired. Offers accessible digital content through an equally accessible web application. Implemented on ontology based on the FRBR-FRAD-FRSAD semantic models.

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OMIROS: Accessible Multi-modal Electronic Library

Research project in collaboration with the Library of the University of Cyprus.

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Oral History Group of Andros

A digital platform of testimonies that functions as a living repository of knowledge — a public tool for research, education and cultural outreach.

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Oral History Group of the Municipality of Chalandri

Oral Narratives and Local History Repository of the Municipality of Chalandri

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Technology Stack

ReasonableGraph is open-source, offered under the GPL license and built by AltSol on a foundation of established, interoperable technologies.

Open Source Technologies

Built on widely adopted open-source technologies, for transparency, adaptability, and continuous innovation.

Interoperability

Imports and exports metadata across a range of standard formats.

Sophisticated Search

An advanced search and retrieval directory (OPAC) with multiple-choice filters that make platform metadata easy to navigate.

Advanced Presentation

Rich, purpose-built ways to present digital items.

Team

Nasos Anagnostou

Developer

Antonis Bairamis

Project Manager

Pantelis Brattis

Librarian, Consultant

Konstantinos Daskalopoulos

Web Developer

Thanos Kyritsis

Developer

Simos Leonidakos

Developer

Kostas Maistrelis

Lead developer

Nikos Ordoulidis

Lead in Digital Humanities

Evangelia Papadaki

Librarian, Archivist

Nikos Papazis

General Manager

The Platform

Core Innovations & Features

All in One Single Installation & Absolute Autonomy

Connecting Heterogeneous Data & Multiple Entities

Responsibility Retention & Access Management

Interoperability & Linked Open Data

AAA Accessibility

Implementations

Current Implementations

Digital Repositories of the Academy of Athens

Lekythos - University of Cyprus Library

MELOS - Greek Music Audiovisual Collections

Hellenic Open University

Digital History and Culture Repository of Saronikos Municipality

UNIC Institutional Repository

Public Central Library Typaldou-Iakovatou Museum of Lixouri

Digital Repository of Chalkida Municipality Library

Greek Modern History Repository - Aselis

AMELib

OMIROS: Accessible Multi-modal Electronic Library

Oral History Group of Andros

Oral History Group of the Municipality of Chalandri

Main Demo

Music Ontologies

Humanities — Syn-Topos

Technology Stack

Open Source Technologies

Interoperability

Sophisticated Search

Advanced Presentation

Team

Nasos Anagnostou

Antonis Bairamis

Pantelis Brattis

Konstantinos Daskalopoulos

Thanos Kyritsis

Simos Leonidakos

Kostas Maistrelis

Nikos Ordoulidis

Evangelia Papadaki

Nikos Papazis

News & Resources

Latest updates