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ODArchive – Creating an Archive for Structured Data from Open Data Portals

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The Semantic Web – ISWC 2020 (ISWC 2020)

Part of the book series: Lecture Notes in Computer Science ((LNISA,volume 12507))

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Abstract

We present ODArchive, a large corpus of structured data collected from over 260 Open Data portals worldwide, alongside with curated, integrated metadata. Furthermore we enrich the harvested datasets by heuristic annotations using the type hierarchies in existing Knowledge Graphs. We both (i) present the underlying distributed architecture to scale up regular harvesting and monitoring changes on these portals, and (ii) make the corpus available via different APIs. Moreover, we (iii) analyse the characteristics of tabular data within the corpus. Our APIs can be used to regularly run such analyses or to reproduce experiments from the literature that have worked on static, not publicly available corpora.

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Notes

  1. 1.

    https://ckan.org/, accessed 2020-08-17.

  2. 2.

    Overall, historically we monitor and have monitored over 260 portals, however, several of those have gone offline in the meantime or are so-called “harvesting” portals that merely replicate metadata from other portals, for details cf. [14].

  3. 3.

    https://github.com/websi96/datasetarchiver.

  4. 4.

    https://docs.mongodb.com/manual/sharding/#shard-keys, accessed 2020-05-22.

  5. 5.

    https://kubernetes.io/, accessed 2020-05-22.

  6. 6.

    To filter datasets by certain data portals we enriched the descriptions by information collected in the Portal Watch (https://data.wu.ac.at/portalwatch/): we use arc:hasPortal to add this reference. More sophisticated federated queries could be formulated by including the Portal Watch endpoint  [14] which contains additional metadata.

  7. 7.

    The resp. information has been extracted from the most recent DBpedia and Wikidata HDT [4] dumps available at http://www.rdfhdt.org/datasets/.

  8. 8.

    While this needs further investigation, and obviously more sophisticated matching techniques (substrings- or similarity-based), we note that this low percentage seems to hint at the specific textual information in OD tables not necessarily being covered by the more general, encyclopedic knowledge typical in public KGs.

  9. 9.

    E.g., “Ja” and “Nein” (German for “yes” and “no”), are labels for entities in Wikidata.

  10. 10.

    https://github.com/ray-project/ray, accessed 2020-08-17.

  11. 11.

    http://ekzhu.com/datasketch/lshensemble.html, accessed 2020-08-17.

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Authors and Affiliations

  1. Vienna University of Economics and Business, Vienna, Austria

    Thomas Weber, Johann Mitöhner, Sebastian Neumaier & Axel Polleres

  2. Complexity Science Hub Vienna, Vienna, Austria

    Axel Polleres

Authors
  1. Thomas Weber
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  2. Johann Mitöhner
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  3. Sebastian Neumaier
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  4. Axel Polleres
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Corresponding author

Correspondence to Thomas Weber .

Editor information

Editors and Affiliations

  1. University of Edinburgh, Edinburgh, UK

    Jeff Z. Pan

  2. University of Liverpool, Liverpool, UK

    Valentina Tamma

  3. University of Bari, Bari, Italy

    Claudia d’Amato

  4. University of California, Santa Barbara, Santa Barbara, CA, USA

    Krzysztof Janowicz

  5. California State University, Long Beach, Long Beach, CA, USA

    Bo Fu

  6. Vienna University of Economics and Business, Vienna, Austria

    Axel Polleres

  7. Rensselaer Polytechnic Institute, Troy, NY, USA

    Oshani Seneviratne

  8. Massachusetts Institute of Technology, Cambridge, MA, USA

    Lalana Kagal

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Weber, T., Mitöhner, J., Neumaier, S., Polleres, A. (2020). ODArchive – Creating an Archive for Structured Data from Open Data Portals. In: Pan, J.Z., et al. The Semantic Web – ISWC 2020. ISWC 2020. Lecture Notes in Computer Science(), vol 12507. Springer, Cham. https://doi.org/10.1007/978-3-030-62466-8_20

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  • DOI: https://doi.org/10.1007/978-3-030-62466-8_20

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