Digital Enterprise Research Institute                                                                    www.deri.ie      ...
Open Government Data (OGD)?Digital Enterprise Research Institute                                             www.deri.ie  ...
Government Data CataloguesDigital Enterprise Research Institute                                         www.deri.ie     So...
Linked Open Data (LOD)Digital Enterprise Research Institute                                           www.deri.ie        ...
Two Key IngredientsDigital Enterprise Research Institute                                          www.deri.ie  1.      RDF...
LOD CloudDigital Enterprise Research Institute                                www.deri.ie     http://lod-cloud.net        ...
Linked Data by DomainDigital Enterprise Research Institute                                    www.deri.ie     Distribution...
Who is doing LOGD?Digital Enterprise Research Institute                                   www.deri.ie       Catalonia http...
Linked Open MetadataDigital Enterprise Research Institute                                        www.deri.ie            D...
Federated CataloguesDigital Enterprise Research Institute                                            www.deri.ie         ...
Federated CataloguesDigital Enterprise Research Institute                                    www.deri.ie                  ...
Government Data CataloguesDigital Enterprise Research Institute                                         www.deri.ie       ...
Government Data CataloguesDigital Enterprise Research Institute                                         www.deri.ie       ...
Data Catalog Vocabulary (dcat)Digital Enterprise Research Institute                                     www.deri.ie       ...
Data Catalog Vocabulary (dcat)Digital Enterprise Research Institute                                   www.deri.ie         ...
How to use dcat?Digital Enterprise Research Institute                                           www.deri.ie            RD...
Asset Description Metadata                                Standard (ADMS)Digital Enterprise Research Institute            ...
Linked Government DataDigital Enterprise Research Institute                                    www.deri.ie            App...
LGD Publishing PipelineDigital Enterprise Research Institute                                    www.deri.ie               ...
LGD Publishing PipelineDigital Enterprise Research Institute                                    www.deri.ie               ...
VoiDDigital Enterprise Research Institute                             www.deri.ie            An RDF Schema vocabulary for...
PointersDigital Enterprise Research Institute                                             www.deri.ie            Dcat    ...
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Lgd 2

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Lgd 2

  1. 1. Digital Enterprise Research Institute www.deri.ie Linked Data & Linked Data Catalogues Fadi Maali, Deirdre Lee Copyright 2011 Digital Enterprise Research Institute. All rights reserved. Enabling Networked Knowledge
  2. 2. Open Government Data (OGD)?Digital Enterprise Research Institute www.deri.ie  Open Data: data that can be freely used, reused and redistributed by anyone.*  Government Data: data and information produced or commissioned by government or government controlled entities.*  Not sensitive or private information but core public data on transport, infrastructure, education, health, crime, environment, etc. *Open Knowledge Foundation (OKF) http://opengovernmentdata.org/what/ Enabling Networked Knowledge
  3. 3. Government Data CataloguesDigital Enterprise Research Institute www.deri.ie Source: http://datos.fundacionctic.org/sandbox/catalog/faceted/ 200 data catalogs Enabling Networked Knowledge
  4. 4. Linked Open Data (LOD)Digital Enterprise Research Institute www.deri.ie  What is LOD?  Use the Web  Use RDF  Interlink data  Why LOD?  Easy to access… part of the Web  Use the existing Web of Data to enrich the data context  Decentralised publishing Still not a magic bullet though! Enabling Networked Knowledge
  5. 5. Two Key IngredientsDigital Enterprise Research Institute www.deri.ie 1. RDF – Resource Description Framework Graph based Data – nodes and arcs  Identifies objects (URIs)  Interlink information (Relationships)  <subject, predicate, object> 2. Vocabularies (Ontologies)  provide shared understanding of a domain  organise knowledge in a machine-comprehensible way  give an exploitable meaning to the data Enabling Networked Knowledge 5 of 46
  6. 6. LOD CloudDigital Enterprise Research Institute www.deri.ie http://lod-cloud.net Enabling Networked Knowledge
  7. 7. Linked Data by DomainDigital Enterprise Research Institute www.deri.ie Distribution of triples by domain Distribution of links by domain http://lod-cloud.net/state Enabling Networked Knowledge
  8. 8. Who is doing LOGD?Digital Enterprise Research Institute www.deri.ie Catalonia http://dadesobertes.gencat.cat Saragossa http://datos.zaragoza.es Enabling Networked Knowledge
  9. 9. Linked Open MetadataDigital Enterprise Research Institute www.deri.ie  Describe Catalogues’ contents as Linked Data  Benefits:  Accessible  Increase findability  Facilitate federated search  Re-use existing models and tools  Accurate digital preservation Enabling Networked Knowledge
  10. 10. Federated CataloguesDigital Enterprise Research Institute www.deri.ie  Existing federations  http://logd.tw.rpi.edu/demo/international_dataset_catalog_search  http://datos.fundacionctic.org/sandbox/catalog/faceted/  http://opengovernmentdata.org/data/catalogues/  http://datacatalogs.org/  http://publicdata.eu/  http://distillr.com/ Enabling Networked Knowledge
  11. 11. Federated CataloguesDigital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge
  12. 12. Government Data CataloguesDigital Enterprise Research Institute www.deri.ie Federated Catalogue Enabling Networked Knowledge
  13. 13. Government Data CataloguesDigital Enterprise Research Institute www.deri.ie Solution Components: • REST interface for Federated Catalogue communication • dcat for data model Enabling Networked Knowledge
  14. 14. Data Catalog Vocabulary (dcat)Digital Enterprise Research Institute www.deri.ie  Dcat is an RDF vocabulary to represent government catalogues  Based on in-depth analysis of seven catalogues from five countries (early 2010)  Dcat is on its way to become standardised as a W3C note by the Government Linked Data working group  Dcat is being used by data.gov.uk and publicdata.eu among others - discuss Enabling Networked Knowledge
  15. 15. Data Catalog Vocabulary (dcat)Digital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge
  16. 16. How to use dcat?Digital Enterprise Research Institute www.deri.ie  RDFa  Embed the RDF data in your HTML pages  The catalogue web site will be your API as well  Google understands RDFa  Data.gov.uk adopts this approach  RDF dump file  A downloadable file  SPARQL endpoint  A query interface Enabling Networked Knowledge
  17. 17. Asset Description Metadata Standard (ADMS)Digital Enterprise Research Institute www.deri.ie  Apply Linked Data to models  Examples:  A list of county names  A taxonomy of classification categories  A model to describe persons  Semic.eu European level metadata repository  ADMS is an RDF vocabulary for metadata repositories Enabling Networked Knowledge
  18. 18. Linked Government DataDigital Enterprise Research Institute www.deri.ie  Apply Linked Data to the actual dataset content  Harness the Linked Data benefits to not only the catalogues but to all your data  A single dataset can’t tell a full story… interlink your data Enabling Networked Knowledge
  19. 19. LGD Publishing PipelineDigital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge
  20. 20. LGD Publishing PipelineDigital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge
  21. 21. VoiDDigital Enterprise Research Institute www.deri.ie  An RDF Schema vocabulary for expressing metadata about RDF datasets Describe datasets and their linking A Semantic Web Interest Group Note (W3C) Enabling Networked Knowledge
  22. 22. PointersDigital Enterprise Research Institute www.deri.ie  Dcat  http://www.w3.org/egov/wiki/Data_Catalog_Vocabulary/Vocabula ry_Reference  ADMS  https://joinup.ec.europa.eu/sites/default/files/ISA_Programme- ADMS-Brochure_2.pdf  VoiD  http://www.w3.org/TR/void/  Google Refine  http://code.google.com/p/google-refine/  http://lab.linkeddata.deri.ie/2010/grefine-rdf-extension/  http://lab.linkeddata.deri.ie/2011/grefine-ckan/ Enabling Networked Knowledge

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