Post on 08-May-2015
description
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Publishing and Using Linked Open Data
Richard J. Urban, Ph.D.
School of Library and Information StudiesFlorida State Universityrurban@fsu.edu@musebrarian
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January 10, 2013Thursday’s Schedule
• 9-10:30 am Class Session: Publishing Linked Data & Linked Data Applications
• 10:30-10:45 am break
• 10:45-Noon Class Session: Linked Open Data
• Noon- 1:00 pm Lunch
• 1:00-3:00 pm Class Session: Open Project Studio
• 3:00-3:15 pm Break
• 3:15-5:00 pm Class Session: Open Project Studio
• 5:30-7:30 pm DHWI Banquet
Humanities Plain and Simple
Location: Colony Ballroom 2203, Stamp Student Union
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PUBLISHING LINKED DATA & LINKED DATA APPLICATIONS
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http://linkeddatabook.com/editions/1.0/#htoc61
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Connect to Existing Data
• SIMILE RDFizershttp://simile.mit.edu/wiki/RDFizers
• D2RQ non-RDF relational data to RDFhttp://d2rq.org/
• OAI2LOD https://github.com/behas/oai2lod
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Publish Files
• What’s the right syntax for your audience?• How to version instance and ontology
data?• Thinking about URIs
– URIs that follow your classes– Not based on underlying software– Designed to persist– URIs for resources vs. URIs for data
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Triplestores: Questions to ask
• What methods can be used to store data?– In Memory, SQL,mySQL, Postgres, etc.
• What level of expressivity is supported?– RDFs, OWL Lite, OWL DL, etc.– Reasoner support
• What rule languages are supported?– SWRL, etc.
• Support for contexts/named graphs• What does the API support?
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Triplestores
• Jenahttp://jena.apache.org/
• Sesamehttp://www.openrdf.org/
• W3C Triplestore resourcehttp://www.w3.org/2001/sw/wiki/Category:Triple_Store
• Virtuoso (proprietary) http://virtuoso.openlinksw.com/
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Interfaces
• Drupal 7http://drupal.org/project/rdf– See also RDF specific modules
• Pubbyhttp://wifo5-03.informatik.uni-mannheim.de/pubby/
• Semantic Wikihttp://semantic-mediawiki.org/wiki/Semantic_MediaWiki
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Embedding Linked Data
• RDFa– http://www.w3.org/TR/xhtml-rdfa-primer/
• Schema.org• Schema.org + RDF
http://schema.rdfs.org/
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LINKED OPEN DATA
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Linked Open Data Criteria
★ Available on the web (whatever format), but with an open license
★★ Available as machine-readable structured data (e.g. excel instead of image scan of a table)
★★★ as (2) plus non-proprietary format (e.g. CSV instead of excel)
★★★★ All the above plus, Use open standards from W3C (RDF and SPARQL) to identify things, so that people can point at your stuff
★★★★★ All the above, plus: Link your data to other people’s data to provide context
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IP
• Risk Management• What’s your risk tolerance?
– Tolerance of your institution?
• Not saying anything about your data IP isn’t much better than a restrictive license.
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Licensing Data
• Open Data Commonshttp://opendatacommons.org/
• Creative Commons 0http://creativecommons.org/choose/zero/
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Humanities Data Citation Practices
• Where do we stand?• How to best give attribution when we use
triples from another source?– Published documentation– Provenance metadata
• What does this attach too?
• DCMI Provenance Metadatahttp://dublincore.org/groups/provenance/
• W3C Provenance WGhttp://www.w3.org/2011/prov/wiki/Main_Page
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For the long run
• DH Data Curation Handbook - Policy, Practice, and Lawhttp://guide.dhcuration.org/legal/policy/
• How will data be maintained over the long term.
• Clear licenses can facilitate preservation.
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Economics of Linked Data
• How to adapt Linked Data to closed publication models?– Make identifiers publically available.– Provide some limited information when the
URI is used. – Release taxonomies/vocabularies as separate
data.