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Brief for W3C Government Linked Data Working Group 29-June 2011
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Brief for W3C Government Linked Data Working Group 29-June 2011


Bernadette Hyland's brief for the W3C

Bernadette Hyland's brief for the W3C

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  • 1. The Joy of Data A cookbook for publishing Linked Data on the Web 10 minute brief to the W3C Gov’t Linked Data Working Group 29-June 2011 Bernadette Hyland bhyland@3roundstones.comThursday, June 23, 2011 1
  • 2. Agenda • Setting the scene • Ingredients ... we use a cooking analogy • Open standards & best practices • Data modeling without context • Social contract as a publisher • Next stepsThursday, June 23, 2011 2
  • 3. Setting the scene ... where should we focus?Thursday, June 23, 2011 3
  • 4. We’ll review • Converting data into RDF • The social contract publishers make • The importance of announcing • Where to turn for guidanceThursday, June 23, 2011 4
  • 5. • A different way of thinking about data • The Open World Assumption • Lots of URIs • To be citizen of the world (not everyone speaks English) • To publish useful information & announce it!Thursday, June 23, 2011 5
  • 6. Publish machine & human readable content • Machine readable format • Human-readable descriptions of your data set • Increase visibility with search engines • Include RDFa or other microformats • Publish a voID description of your RDF datasetThursday, June 23, 2011 6
  • 7. There is a Process Identify Model Name Describe Convert Publish MaintainThursday, June 23, 2011 7
  • 8. Preparation 1. Leverage what exists • Request a copy of the logical and physical model of the database(s) • Obtain data extracts (i.e., databases and/or spreadsheets) or create data in a way that can be replicated.Thursday, June 23, 2011 8
  • 9. Modeling the data 2. Model data without context to allow for reuse and easier merging of data sets • Traditional DBAs organize data for specified Web services or applications. • With LD, application logic does not drive the data schema, concepts, etc.Thursday, June 23, 2011 9
  • 10. Modeling the data 3. Look for real world objects of interest (e.g., people, places, things, locations, etc.) and model them. • Investigate how others are already modeling similar or related data. • Look for duplication and normalize the data • Use common sense to decide whether or not to make linkThursday, June 23, 2011 10
  • 11. Modeling the data ... 4. Connect data from different sources and authoritative vocabularies (see list of popular vocabularies below). • Use URIs as names for your objectsThursday, June 23, 2011 11
  • 12. Modeling the data ... • Put aside immediate needs of any application • Don’t think about how an application will use your data • Do think about time and how the data will change over time.Thursday, June 23, 2011 12
  • 13. Convert, Publish & Maintain 5. Write a script or process to convert the data set repeatedly 6. Publish to the Web and announce it! (more details shortly) 7. Maintenance strategy (more details in the social contract at the end)Thursday, June 23, 2011 13
  • 14. Take the plunge ... Be forgiving • Simplistic data models can still be useful • Better to make progress with something rather than do nothing because we cannot be comprehensive and completeThursday, June 23, 2011 14
  • 15. Take an iterative approach 1. Review of modeling decisions 2. Review vocabularies chosen and developed 3. Modify/update data conversion scripts 4. Do a maintenance walk-through with real use cases 5. Show how to explore data with SPARQL and visualizations 6. Discuss a persistent identifier strategy (think PURLs)Thursday, June 23, 2011 15
  • 16. Describe your dataThursday, June 23, 2011 16
  • 17. Data stewards should.... • Make data accessible via the Web’s standard access mechanism, specifically http URIs • Represent data in a common format, such as RDF/XML, Notation-3 (N3), Turtle, N- Triples, RDFa, and RDF/JSON • Provide self describing dataThursday, June 23, 2011 17
  • 18. Linked Data Formats • RDF/XML - RDF for XML pipelines • Turtle - Human-readable RDF • XHTML with GRDDL transformation • XHTML with embedded RDFa • RDF Schema - Describing structureThursday, June 23, 2011 18
  • 19. In a tart, smoothie or margarita ... berries can be combined in different waysThursday, June 23, 2011 19
  • 20. The Social Contract ... The not so fine print • LOD is a social contract to provide the public with information • Follow best practices for modeling • Carefully consider your URI strategy • Ensure that your LOD remains available where you say it will be • Publish voID description • For a government agency ... a data policy is “a must” • specify data quality and retention, treatment of data thru secondary sources, restrictions for use, frequency of updates, public participation, and applicability of this data policyThursday, June 23, 2011 20
  • 21. Announcing the finished product!Thursday, June 23, 2011 21
  • 22. •Inform the LOD developer community (, W3 lists) •Announce to search engines (RDFa hints, register to make accessible) •Publish human readable descriptions •Encourage interlinking •Publish schema as voID •Include SPARQL endpointThursday, June 23, 2011 22
  • 23. This work is Copyright © 2011 3 Round Stones Inc. It is licensed under the Creative Commons Attribution 3.0 Unported License Full details at: You are free: to Share — to copy, distribute and transmit the work to Remix — to adapt the work Under the following conditions: Attribution. You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). • For any reuse or distribution, you must make clear to others the license terms of this work. • Any of the above conditions can be waived if you get permission from the copyright holder. • Nothing in this license impairs or restricts the authors moral rights. • Some Content in the work may be licensed under different terms, this is noted separately.Thursday, June 23, 2011 23
  • 24. Thursday, June 23, 2011 24