Transmission6 - Publishing Linked Data

Publishing Linked Data Getting started Bill Roberts bill@swirrl.com Transmission #6 21 July 2010

Other data sources Your DATA Our SYSTEM The WORLD

Objective Make it easier for people to ﬁnd, understand and use your data.

Linked Data 1. Use URIs as names for things 2. Use HTTP URIs so that people can look up those names 3. When someone looks up a URI, provide useful information, using the standards 4. Include links to other URIs so that they can

Tom Scott of the BBC: ”...for those considering the Linked Data approach we’d say that 95% of the work is work you should be doing just to build for the (non-semantic) web. Get the fundamentals right and the leap to the Semantic Web is really

Examples to copy • data.gov.uk • BBC • Ordnance Survey

What do I have to do? • What are the important things to describe? • Identifiers • Regular web pages AND data • Describe the things using RDF • Links to other data and datasets • Licensing • Publish (flat files, CMS, DB-backed web app...)

Icing on the cake • SPARQL end point • Data dumps • Semantic site map • Update feed

What’s the data about?

Identiﬁers

Identiﬁers Assign a URI in your domain: http://www.bbc.co.uk/nature/species/ European_Water_Vole#species http://data.ordnancesurvey.co.uk/id/50kGazetteer/ 155254 http://education.data.gov.uk/id/school/135524

Regular web pages AND data

OS approach: Identiﬁer: http://data.ordnancesurvey.co.uk/id/50kGazetteer/155254 HTML version: http://data.ordnancesurvey.co.uk/doc/50kGazetteer/155254 RDF version: http://data.ordnancesurvey.co.uk/doc/50kGazetteer/ 155254.rdf JSON version: http://data.ordnancesurvey.co.uk/doc/50kGazetteer/ 155254.json ...

BBC approach Identiﬁer: http://www.bbc.co.uk/nature/species/ European_Water_Vole#species HTML version: http://www.bbc.co.uk/nature/species/ European_Water_Vole RDF version: http://www.bbc.co.uk/nature/species/ European_Water_Vole.rdf ...

“When someone looks up a URI, provide useful information, using the standards”

Content negotiation Tell me about .../id/school/1234 and I want it in RDF you need to look up .../doc/school/1234.rdf (“303 See Other”) OK, give me .../doc/school/1234.rdf RDF document

Describe things with RDF @prefix owl: <http://www.w3.org/2002/07/owl#> . Thing @prefix bbc: <http://www.bbc.co.uk/nature/species/> . @prefix wo: <http://purl.org/ontology/wo> . bbc:European_Water_Vole owl:sameAs <http://dbpedia.org/resource/European_Water_Vole> ; wo:order <http://www.bbc.co.uk/nature/order/Rodent#order> . Attributes and values

Describe things with RDF • Existing common ontologies - collections of properties and types • FOAF, Dublin Core, SKOS, Admingeo, Geonames... • Or make up your own

Linked Data <http://www.bbc.co.uk/programmes/p008ffmy#programme> po:subject <http://www.bbc.co.uk/nature/species/European_Water_Vole#species> . <http://news.bbc.co.uk/1/hi/scotland/highlands_and_islands/8659760.stm> foaf:primaryTopic <http://www.bbc.co.uk/nature/species/European_Water_Vole#species> . ex:school ex:administrativeWard <http://statistics.data.gov.uk/id/local-authority-ward/00QAMH>

Licence: tell people what it is

Publish • ﬂat ﬁles • web app (growing list of libraries, RDF database engines...) • third party services

Querying the data

Summary: It’s simpler than it looks

Thanks Bill Roberts bill@swirrl.com Transmission #6 21 July 2010

Transmission6 - Publishing Linked Data

by Bill Roberts on Jul 22, 2010

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Transmission6 - Publishing Linked Data — Presentation Transcript