Lgd 2

Lgd 2

• 1.
  Digital Enterprise ResearchInstitute 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.
  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.
  Government Data Catalogues DigitalEnterprise Research Institute www.deri.ie Source: http://datos.fundacionctic.org/sandbox/catalog/faceted/ 200 data catalogs Enabling Networked Knowledge
• 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.
  Two Key Ingredients DigitalEnterprise 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.
  LOD Cloud Digital EnterpriseResearch Institute www.deri.ie http://lod-cloud.net Enabling Networked Knowledge
• 7.
  Linked Data byDomain Digital 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.
  Who is doingLOGD? Digital Enterprise Research Institute www.deri.ie Catalonia http://dadesobertes.gencat.cat Saragossa http://datos.zaragoza.es Enabling Networked Knowledge
• 9.
  Linked Open Metadata DigitalEnterprise 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.
  Federated Catalogues Digital EnterpriseResearch 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.
  Federated Catalogues Digital EnterpriseResearch Institute www.deri.ie Enabling Networked Knowledge
• 12.
  Government Data Catalogues DigitalEnterprise Research Institute www.deri.ie Federated Catalogue Enabling Networked Knowledge
• 13.
  Government Data Catalogues DigitalEnterprise Research Institute www.deri.ie Solution Components: • REST interface for Federated Catalogue communication • dcat for data model Enabling Networked Knowledge
• 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.
  Data Catalog Vocabulary(dcat) Digital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge
• 16.
  How to usedcat? 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.
  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.
  Linked Government Data DigitalEnterprise 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.
  LGD Publishing Pipeline DigitalEnterprise Research Institute www.deri.ie Enabling Networked Knowledge
• 20.
  LGD Publishing Pipeline DigitalEnterprise Research Institute www.deri.ie Enabling Networked Knowledge
• 21.
  VoiD Digital Enterprise ResearchInstitute 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.
  Pointers Digital Enterprise ResearchInstitute 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