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A framework for the automated thematic annotation of Open Government Data.

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Title: A framework for the automated thematic annotation of Open Government Data.
Authors: Abdul, Aziz1 abdul.aziz@unizar.es, Mohsan, Ali2 mohsan@aegean.gr, Dagoberto José, Herrera-Murillo1 dherrera@unizar.es, Maria Ioanna, Maratsi2 ioanna.m@aegean.gr, Francisco J., Lopez-Pellicer1 fjlopez@unizar.es, Javier, Nogueras-Iso1 jnog@unizar.es
Source: Computer Science & Information Systems. Apr2026, Vol. 23 Issue 2, p917-945. 29p.
Subjects: Annotations, Supervised learning, Machine learning, Tags (Metadata), Data libraries, Transparency in government, Resemblance (Philosophy), Automatic classification
Abstract: Governmental policies for transparency and reuse of public sector information have encouraged the launch of open government data portals around the world. Many of these portals are based on pyramidal structures: national open data portals are aggregators of the contents harvested from open data portals maintained by governments in charge of administrative areas with a narrower scope. Taking into account this hierarchical organization, these open data portals lack consistent and scalable mechanisms for thematic annotation, limiting dataset discoverability. This work proposes a framework for the automated thematic classification of open government data. The framework integrates (i) thematic annotation quality assessment, (ii) supervised machine learning models trained on annotated metadata corpora, and (iii) embedding-based semantic similarity methods for theme assignment in the absence of reliable annotations. The framework is evaluated using 29,793 datasets from data.europa.eu, the European open data portal. Experimental results show that supervised models achieve high classification performance, with Support Vector Machines reaching an accuracy of 93.65%, while unsupervised embedding-based approaches achieve substantial semantic agreement with portal-assigned themes (74.56%) using transformer-based representations. These results demonstrate that the proposed framework enables scalable, consistent, and interoperable thematic annotation, offering both theoretical contributions to automated metadata enrichment and practical value for integration into large-scale open data portal infrastructures. [ABSTRACT FROM AUTHOR]
Copyright of Computer Science & Information Systems is the property of ComSIS Consortium and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A framework for the automated thematic annotation of Open Government Data.
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  Data: <searchLink fieldCode="AR" term="%22Abdul%2C+Aziz%22">Abdul, Aziz</searchLink><relatesTo>1</relatesTo><i> abdul.aziz@unizar.es</i><br /><searchLink fieldCode="AR" term="%22Mohsan%2C+Ali%22">Mohsan, Ali</searchLink><relatesTo>2</relatesTo><i> mohsan@aegean.gr</i><br /><searchLink fieldCode="AR" term="%22Dagoberto+José%2C+Herrera-Murillo%22">Dagoberto José, Herrera-Murillo</searchLink><relatesTo>1</relatesTo><i> dherrera@unizar.es</i><br /><searchLink fieldCode="AR" term="%22Maria+Ioanna%2C+Maratsi%22">Maria Ioanna, Maratsi</searchLink><relatesTo>2</relatesTo><i> ioanna.m@aegean.gr</i><br /><searchLink fieldCode="AR" term="%22Francisco+J%2E%2C+Lopez-Pellicer%22">Francisco J., Lopez-Pellicer</searchLink><relatesTo>1</relatesTo><i> fjlopez@unizar.es</i><br /><searchLink fieldCode="AR" term="%22Javier%2C+Nogueras-Iso%22">Javier, Nogueras-Iso</searchLink><relatesTo>1</relatesTo><i> jnog@unizar.es</i>
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  Data: <searchLink fieldCode="DE" term="%22Annotations%22">Annotations</searchLink><br /><searchLink fieldCode="DE" term="%22Supervised+learning%22">Supervised learning</searchLink><br /><searchLink fieldCode="DE" term="%22Machine+learning%22">Machine learning</searchLink><br /><searchLink fieldCode="DE" term="%22Tags+%28Metadata%29%22">Tags (Metadata)</searchLink><br /><searchLink fieldCode="DE" term="%22Data+libraries%22">Data libraries</searchLink><br /><searchLink fieldCode="DE" term="%22Transparency+in+government%22">Transparency in government</searchLink><br /><searchLink fieldCode="DE" term="%22Resemblance+%28Philosophy%29%22">Resemblance (Philosophy)</searchLink><br /><searchLink fieldCode="DE" term="%22Automatic+classification%22">Automatic classification</searchLink>
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  Data: Governmental policies for transparency and reuse of public sector information have encouraged the launch of open government data portals around the world. Many of these portals are based on pyramidal structures: national open data portals are aggregators of the contents harvested from open data portals maintained by governments in charge of administrative areas with a narrower scope. Taking into account this hierarchical organization, these open data portals lack consistent and scalable mechanisms for thematic annotation, limiting dataset discoverability. This work proposes a framework for the automated thematic classification of open government data. The framework integrates (i) thematic annotation quality assessment, (ii) supervised machine learning models trained on annotated metadata corpora, and (iii) embedding-based semantic similarity methods for theme assignment in the absence of reliable annotations. The framework is evaluated using 29,793 datasets from data.europa.eu, the European open data portal. Experimental results show that supervised models achieve high classification performance, with Support Vector Machines reaching an accuracy of 93.65%, while unsupervised embedding-based approaches achieve substantial semantic agreement with portal-assigned themes (74.56%) using transformer-based representations. These results demonstrate that the proposed framework enables scalable, consistent, and interoperable thematic annotation, offering both theoretical contributions to automated metadata enrichment and practical value for integration into large-scale open data portal infrastructures. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Computer Science & Information Systems is the property of ComSIS Consortium and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2298/CSIS251029022A
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      – SubjectFull: Resemblance (Philosophy)
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      – SubjectFull: Automatic classification
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      – TitleFull: A framework for the automated thematic annotation of Open Government Data.
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              Text: Apr2026
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              Y: 2026
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