Linked Data: opportunities and challenges

Digital Enterprise Research Institute www.deri.ie Linked Data: opportunities and challenges Dr. Michael Hausenblas, DERI, NUI Galway Open Science Data Cloud NSF PIRE Workshop, Edinburgh, UK, 18 July 2012 Copyright 2011 Digital Enterprise Research Institute. All rights reserved. Enabling Networked Knowledge

Linked Data 101

Linked Data principles① Use URIs to identify the “things” in your data② Use HTTP URIs so people & machines can look them up③ When a URI is looked up return a description of the thing in a structured format (RDF)④ Link to related things to provide context http://www.w3.org/DesignIssues/LinkedData.html

HTTP URIs

HTTP URIscurl -L -H "Accept: application/rdf+xml" http://dbpedia.org/resource/Edinburgh<?xml version="1.0" encoding="utf-8" ?><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:dbpedia-owl="http://dbpedia.org/ontology/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dbpprop="http://dbpedia.org/property/" xmlns:ns10="http://dbpedia.org/property/start/" > <rdf:Description rdf:about="http://dbpedia.org/resource/Firrhill_High_School"> <dbpedia-owl:city rdf:resource="http://dbpedia.org/resource/Edinburgh" /> </rdf:Description> <rdf:Description rdf:about="http://dbpedia.org/resource/Murrayfield_Stadium"> <dbpedia-owl:location rdf:resource="http://dbpedia.org/resource/Edinburgh" /> <dbpprop:location rdf:resource="http://dbpedia.org/resource/Edinburgh" /> </rdf:Description> <rdf:Description rdf:about="http://dbpedia.org/resource/Stewart%27s_Melville_College"> <dbpedia-owl:city rdf:resource="http://dbpedia.org/resource/Edinburgh" /> <dbpprop:city rdf:resource="http://dbpedia.org/resource/Edinburgh" /> </rdf:Description>

HTTP URIscurl -L -H "Accept: text/turtle" http://data.ordnancesurvey.co.uk/id/7000000000017765<http://data.ordnancesurvey.co.uk/doc/7000000000017765> rdf:type foaf:Document, dctype:Text ; foaf:primaryTopic <http://data.ordnancesurvey.co.uk/id/7000000000017765> ; dct:title "Linked Data for The County of Hampshire" ; dct:hasFormat <http://data.ordnancesurvey.co.uk/doc/7000000000017765.rdf> , <http://data.ordnancesurvey.co.uk/doc/7000000000017765.html> , <http://data.ordnancesurvey.co.uk/doc/7000000000017765.json> , <http://data.ordnancesurvey.co.uk/doc/7000000000017765.ttl> .<http://data.ordnancesurvey.co.uk/id/7000000000017636> rdfs:label "Tadley" ; skos:prefLabel "Tadley" .<http://data.ordnancesurvey.co.uk/id/7000000000017510> rdfs:label "Newton Valence" ; skos:prefLabel "Newton Valence" .<http://data.ordnancesurvey.co.uk/id/7000000000017817> rdfs:label "Ashmansworth" ; skos:prefLabel "Ashmansworth" .

HTTP URIscurl -L -H "Accept: text/turtle” http://bio2rdf.org/genbank:AC008393@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .@prefix owl: <http://www.w3.org/2002/07/owl#> .@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .@prefix dc: http://purl.org/dc/elements/1.1/ .<http://bio2rdf.org/genbank:AC008393> a <http://bio2rdf.org/genbank_resource:Sequence> ; rdfs:label "Homo sapiens chromosome 5 clone CTC-241N9, complete sequence [genbank:AC008393]"; owl:sameAs <http://bio2rdf.org/genbank:ac008393> ; dc:title "Homo sapiens chromosome 5 clone CTC-241N9, complete sequence" ; dc:modified "26-FEB-2002" ; <http://bio2rdf.org/bio2rdf_resource:length> "166847" ; <http://bio2rdf.org/bio2rdf_resource:linkedToFrom>

HTTP URIscurl -L -H "Accept: text/turtle” http://bnb.data.bl.uk/doc/resource/009468944@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .@prefix dct: <http://purl.org/dc/terms/> .@prefix blterms: <http://www.bl.uk/schemas/bibliographic/blterms#> .@prefix elements: <http://iflastandards.info/ns/isbd/elements/> .@prefix bibo: <http://purl.org/ontology/bibo/> .@prefix owl: <http://www.w3.org/2002/07/owl#> .@prefix foaf: <http://xmlns.com/foaf/0.1/> .@prefix linked-data: <http://purl.org/linked-data/api/vocab#> .@prefix void: <http://rdfs.org/ns/void#> .<http://bnb.data.bl.uk/id/resource/009468944> dct:language <http://lexvo.org/id/iso639-3/eng> ; rdfs:seeAlso <http://www4.wiwiss.fu-berlin.de/bookmashup/books/0859761541> ; elements:P1053 "vii,147p."@en ; rdfs:label "William Wallace / Andrew Fisher" ; blterms:bnb "GB8714157" ; dct:creator <http://bnb.data.bl.uk/id/person/FisherAndrew1935-> ; bibo:isbn10 "0859761541" ; dct:title "William Wallace" ; rdf:type bibo:Book , dct:BibliographicResource ; dct:subject <http://bnb.data.bl.uk/id/concept/ddc/e19/941.1020924> .

Linked Open Data

Linked Open Data cloud 2007 2008 2008 2010 2009 2008 2009 2008 10

Linked Open Data cloudhttp://lod-cloud.net/ Over 300 open data sets with 40 billion facts, interlinked by 500 million typed links.

Linked Open Data cloud statsDigital Enterprise Research Institute www.deri.ie triples distribution links distribution http://lod-cloud.net/state/ Enabling Networked Knowledge

… cost and benefits

Linked Data life cycles

Linked Data life cyclesDigital Enterprise Research Institute www.deri.ie http://linked-data-life-cycles.info 1 2 3 4 5 6 data modeling publishing discovery integration use cases awareness LOD cloud Neologism Google Refine FYN LATC 24/7 data-gov.ie 5stardata.info Schema.org D2RQ LATC DSI Enabling Networked Knowledge

ModelingDigital Enterprise Research Institute www.deri.ie 1 2 3 4 5 6 data modeling publishing discovery integration use cases awareness LOD cloud Neologism Google Refine FYN LATC 24/7 data-gov.ie 5stardata.info Schema.org D2RQ LATC DSI Enabling Networked Knowledge

NeologismDigital Enterprise Research Institute www.deri.ie http://neologism.deri.ie/ Enabling Networked Knowledge

NeologismDigital Enterprise Research Institute www.deri.ie http://vocab.data.gov/ Enabling Networked Knowledge

Schema.org – Linked DataDigital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge

PublishingDigital Enterprise Research Institute www.deri.ie 1 2 3 4 5 6 data modeling publishing discovery integration use cases awareness LOD cloud Neologism Google Refine FYN LATC 24/7 data-gov.ie 5stardata.info Schema.org D2RQ LATC DSI Enabling Networked Knowledge

Google Refine extensionDigital Enterprise Research Institute www.deri.iehttp://lab.linkeddata.deri.ie/2010/grefine-rdf-extension/ Enabling Networked Knowledge

RDB2RDF – D2RQDigital Enterprise Research Institute www.deri.iehttp://d2rq.org/ Enabling Networked Knowledge

DiscoveryDigital Enterprise Research Institute www.deri.ie 1 2 3 4 5 6 data modeling publishing discovery integration use cases awareness LOD cloud Neologism Google Refine FYN LATC 24/7 data-gov.ie 5stardata.info Schema.org D2RQ LATC DSI Enabling Networked Knowledge

Follow-Your-NoseDigital Enterprise Research Institute www.deri.ie Enabling Networked Knowledge 24

Dataset discoveryDigital Enterprise Research Institute www.deri.iehttp://dsi.lod-cloud.net/ Enabling Networked Knowledge

IntegrationDigital Enterprise Research Institute www.deri.ie 1 2 3 4 5 6 data modeling publishing discovery integration use cases awareness LOD cloud Neologism Google Refine FYN LATC 24/7 data-gov.ie 5stardata.info Schema.org D2RQ LATC DSI Enabling Networked Knowledge

Why linking?Digital Enterprise Research Institute www.deri.ie http://webofdata.wordpress.com/2011/05/22/why-we-link/Central Contractor Registration (CCR) Geonames Enabling Networked Knowledge

Effort distributionDigital Enterprise Research Institute www.deri.ie Third Fix Publisher‘s Party Effort Overall Data Effort Integration Effort Consumer‘s Effort Enabling Networked Knowledge

LATC – Interlinking PlatformDigital Enterprise Research Institute www.deri.iehttp://latc-project.eu/platform Enabling Networked Knowledge

http://www4.wiwiss.fu-berlin.de/latc/toollibrary/screencast.html

ConclusionDigital Enterprise Research Institute www.deri.ie Opportunities  Use the LOD cloud as test-bed (experiments)  Benefit from LOD cloud in apps (context)  Contribute to make your data more valuable Challenges  Large-scale processing of Linked Data  Distributed/federated SPARQL queries  Quality of links and the data Enabling Networked Knowledge

ResourcesDigital Enterprise Research Institute www.deri.ie Tutorials, technologies, specifications:  http://linkeddatabook.com  http://lod-cloud.net  http://linkeddata.org  http://linkeddata-specs.info  http://schema.rdfs.org Videos:  http://ted.com/talks/tim_berners_lee_on_the_next_web.html - Tim Berners-Lee’s TED talk  http://www.youtube.com/watch?v=GKfJ5onP5SQ - Linked Data (and the Web of Data)  http://www.youtube.com/watch?v=4x_xzT5eF5Q - What is Linked Data?  http://vimeo.com/36752317 - Linked Open Data (by Europeana) Enabling Networked Knowledge

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Linked Data: opportunities and challenges

by Michael Hausenblas on Jul 18, 2012

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