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PHDD – An RDF Vocabulary for the Physical Data Description Work in Progress

PHDD – An RDF Vocabulary for the Physical Data Description Work in Progress. Joachim Wackerow and Thomas Bosch (both GESIS – Leibniz Institute for the Social Sciences). What is it ?. Description of the physical properties of a data file . Focus on most common format types

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PHDD – An RDF Vocabulary for the Physical Data Description Work in Progress

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  1. PHDD – An RDF Vocabulary for the Physical Data DescriptionWork in Progress Joachim Wackerow and Thomas Bosch (both GESIS – Leibniz Institute for the Social Sciences)

  2. Whatisit? • Description ofthephysicalpropertiesof a datafile. • Focus on mostcommonformattypes • Rectangularformat • Character-separatedvalues(CSV) orfixed-recordlength

  3. Character-separated Values Header row

  4. Fixed Record-length Format

  5. Motivation • Data.gov andsimilarinitiatives providedata in CSV formatorsimilar • W3C Government Linked Data Working Group Charter • “The mission … is to provide standards and other information which help governments around the world publish their data as effective and usable Linked Data using Semantic Web technologies.” • Machine-actionability - intendedforprogramuse

  6. Example at data.gov

  7. ExistingApproaches • CSV on the Web Working Group Charter (W3C) • Linkage • Linked CSV (JeniTennison) • CSV linked data (Quoderat) • Description • Common Format and MIME Type for Comma-Separated Values (CSV) Files, RFC 4180 • csv: a vocabulary for describing CSV files (Rurik Thomas Greenall, Norwegian University at Trondheim) • Representations • URI design for RDF conversion of CSV-based data (Tim Lebo, Gregory Todd Williams) • CSV2RDF Application (Ivan Ermilov, Sören Auer, Claus Stadler) Research results: • Intendedfor different purposes • Description approaches not sufficient

  8. PHDD – First Ideas

  9. PHDD – UML Model

  10. PHDD - Overview General approachis not reallynew, just a completesetofpropertiesforthemostcommoncases. Structure • Table – therectangulardatafile [disco::DataFile, dcat::Distribution] • TableStructure - commonproperties plus specificonesfordelimitedandfixedcolumns • Column - commonproperties plus specificonesfordelimitedandfixedcolumns [disco::Variable]

  11. Table Structure

  12. Column Description

  13. Usage Scenarios Data DDI XML Data Data Provider PHDD Discovery DCAT Description Program User Transformation Analysis Search

  14. Relationshipto DDI XML • Mapping to DDI XML Specifications • DDI Codebook 2.* • approx. half ofthepropertiesof PHDD • DDI Lifecycle 3.* • almost all propertiesof PHDD

  15. Relationshipof DDI Specifications XML Schema OWL/RDF PHDD DDI Codebook 2.* Discovery DDI Lifecycle 3.* XKOS DDI 4 Model Future XML Schema Representation OWL/RDF Representation

  16. Acknowledgements • Contributionsby • Larry Hoyle (Institute for Policy & Social Research, University of Kansas) • Richard Cyganiak(DERI - Digital Enterprise Research Institute )

  17. Further Information • Development repositoryof PHDD • https://github.com/linked-statistics/physical-data-description • DDI Alliance RDF Vocabularies • http://www.ddialliance.org/Specification/RDF

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