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DCAT: a tale of exchanging metadata

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DCAT-AP: Exchanging metadata

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DCAT: a tale of exchanging metadata

  1. 1. DCAT-AP Exchanging metadata OpenBelgium – Antwerp – 2/2016 Bart Hanssens
  2. 2. | p. 2 Agenda  History lessons  Exchanging metadata  DCAT / DCAT-AP  Tools and resources  Homework  Questions ?
  3. 3. | p. 3 Belgian Constitution (1831), art.32 Everyone has the right to consult any administrative document and to obtain a copy, except in the cases and conditions stipulated by the laws, federate laws or rules referred to in Article 134.
  4. 4. | p. 4 Mundaneum (ca.1920) By fdecomite - Flickr: Drawers, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=15888697
  5. 5. Exchanging metadata It's not rocket science
  6. 6. | p. 6 Everyone loves portals, right ?  Because there are so many of them …  Administrations: local / regional / federal / EU …  Sector / type: biodiversity, geo, statistics, ...  … powered by different platforms  CKAN, DKAN, OpenDataSoft, TheDataTank, ...
  7. 7. | p. 7 Interoperability X Y Standard metadata format ABC Z
  8. 8. DCAT and DCAT-AP (Not) reinventing the wheel
  9. 9. | p. 9 What is DCAT ?  “Data CATalog”  Metadata (only)  Title, language, description…  Based on earliest US / UK / NZ … open data portals  International specification  Originally (2010) developed by DERI university  Now maintained by W3C  It is NOT an API / data format / silver bullet
  10. 10. | p. 10 Reuses existing specifications  RDF vocabulary  Cool => linked open metadata !  Reuses other well-known RDF vocabularies  Dublin Core metadata, FOAF, SKOS  vCard in RDF  (SDMX, ADMS)
  11. 11. | p. 11 DCAT Catalog (~ portal) Title Description Homepage Geo area Publisher … Dataset Dataset Dataset Distribution Distribution Distribution Distribution
  12. 12. | p. 12 DCAT Dataset Title Description Keyword(s) Theme(s) Language(s) Contact … Catalog Distribution Distribution
  13. 13. | p. 13 DCAT Distribution (~download) Title Description Created, Modified Download URL License, Rights Format … Catalog Dataset
  14. 14. | p. 14 What is DCAT-AP ?  DCAT “Application Profile”  Stricter than DCAT  Mandatory / recommended properties  Maintained by (mainly) EU experts on JoinUp  Optional status, language on Distribution  Controlled lists / vocabularies  Categories, languages, file types, geonames …
  15. 15. | p. 15 DCAT-AP: languages in Distribution Dataset - “Title”@nl - “Title”@fr ... Distribution - “Title”@nl - DownloadURL Distribution - “Title”@fr - DownloadURL - MediaType
  16. 16. | p. 16 More profiles / extensions ...  GeoDCAT-AP  Does not replace (EU Directive) INSPIRE metadata !  A lot of structured metadata already available  Mapping + XSLT conversion tool  StatDCAT-AP  Eurostat, IMF, OECD... use SDMX format for statistics  Mapping + conversion tool to be developed
  17. 17. | p. 17 A note on GeoDCAT-AP  Covers ISO 19115 core + INSPIRE metadata  Mapping AGROVOC / GEMET / INSPIRE themes  XSLT script  Converts ISO 19139 XML metadata to GeoDCAT-AP  Open source CSW API (experimental)
  18. 18. Homework Left as an exercise for the pusblisher
  19. 19. | p. 19 Your categories or mine ?
  20. 20. | p. 20 Interoperability (again) X Y Well-known taxonomy ABC Z
  21. 21. | p. 21 Map and publish !  No need to give up your own taxonomies  Map your keywords/categories to known vocabularies  SKOS is your friend  RDF vocabulary for controlled lists, taxonomies ...  “Simple”: exactMatch, closeMatch, altLabel...  Publish mappings as open data  Taxonomies for update frequency, location...  dcterms:accrualPeriodicity, dcterms:spatial  dcat:mediaType
  22. 22. | p. 22 Missing in action / work in progress  Identifiers for (republished) datasets …  E.g. “harvested” metadata, plain old websites...  Roles  “creator”, “publisher”, “portal harvester” … ?  URIs for organisations  Companies, administrations… and smaller units
  23. 23. Tools and resources
  24. 24. | p. 24 Specifications  W3C DCAT  https://www.w3.org/TR/vocab-dcat/  DCAT-AP  https://joinup.ec.europa.eu/asset/dcat_application_profil e/description  Geo / Stat DCAT-AP  https://joinup.ec.europa.eu/asset/dcat_application_prof ile/asset_release/geodcat-ap-v10  https://joinup.ec.europa.eu/asset/stat_dcat_application_p rofile/description
  25. 25. | p. 25 Tools  CKAN DCAT extension  https://github.com/ckan/ckanext-dcat  Replaces “old” RDF templates in CKAN 2.5  DCAT validators  https://validator.dcat-editor.com/  https://github.com/oSoc15/dcat-validator  Drupal Experimental DCAT export  https://www.drupal.org/project/sdcate  DCAT-AP editor  https://dcat-editor.com
  26. 26. | p. 26 Other  DCAT “fan page”  http://dcat.be  EU Publication Office vocabularies  http://publications.europa.eu/mdr/authority/  Data.gov.be DCAT dumps / mappings etc  https://github.com/fedict/dcattools
  27. 27. Questions ?
  28. 28. Thanks ! Bart Hanssens / Fedict Simon Bolivarlaan 30 1000 Brussels, Belgium @BartHanssens bart.hanssens [at] fedict.be | www.fedict.belgium.be

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