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Linked Data

Linked Data. for Libraries, Archives, Museums. Learning objectives. Define the concept of linked data State 3 benefits of creating linked data and making it available Outline the process of creating LD State how to make use of LD created by others. Basic Terms. Linked Data (LD).

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Linked Data

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  1. Linked Data for Libraries, Archives, Museums

  2. Learning objectives • Define the concept of linked data • State 3 benefits of creating linked data and making it available • Outline the process of creating LD • State how to make use of LD created by others

  3. Basic Terms

  4. Linked Data (LD) "a term used to describe a recommended best practice for exposing, sharing, and connecting pieces of data, information, and knowledge on the Semantic Web using URIs and RDF." http://linkeddata.org/faq

  5. Linked Open Data (LOD) Linked Data that is explicitly published under an open license. Not all Linked Data will be open, and not all Open Data will be linked

  6. LOD-LAM Linked Open Data in Libraries Archives Museums #lodlam

  7. URI Uniform Resource Identifier A string of characters used to identify a name or resource on the Internet

  8. RDF Resource Description Framework “a metadata data model. It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax formats.” Wikipedia

  9. RDF Defined statements compromising a subject, a predicate (property), and an object. These statements are called “triples”

  10. SPARQL SPARQL protocol and RDF Query Language SPARQL Endpoint: “URL for a given set of RDF data that you can send queries to and get answers from” Dorothea Salo

  11. Linked Data (LD) Linked data “describes a method of publishing structured data so that it can be interlinked and become more useful. It builds upon standard Web technologies such as HTTP and URIs, but rather than using them to serve web pages for human readers, it extends them to share information in a way that can be read automatically by computers. This enables data from different sources to be connected and queried” Wikipedia definition

  12. Web of documentsvs.Web of data

  13. resource links to links to resource links to links to resource links to links to links to • resource links to links to resource Diagram by Emily Nimsakont

  14. data links to data data data links to data data links to data data data data data links to data data data data Diagram by Emily Nimsakont

  15. Relationship grammar relatedTo Resource B Resource A Describe resources using interrelated “statements” (RDF triples) Use URIs – unique globally managed identifiers as the “words” of the statement Slide by DCMI tutorial “What makes the Linked Data Approach Different”

  16. Traditional metadata = Implicit Relationships MARC Bibliographic Record 100 10 Smart, Laura J. ǂq (Laura Jean), ǂd 1971-245 00 Women in Science ǂh [electronic resource].

  17. Linked Data is Explicit isCreatorOf Women in Science Women in Science sdsc.edu/ScienceWomen Laura J. Smart isTitleOf Object – predicate - subject

  18. Triple with URIs Laura J. Smarthttp://viaf.org/viaf/171972263 is creator ofhttp://purl.org/dc/terms/creator Women in Science http://www.sdsc.edu/ScienceWomen

  19. Under the hood <?xml version="1.0" encoding="utf-8"?><rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"xmlns:dc="http://purl.org/dc/elements/1.1/"<rdf:Description rdf:about="http://www.sdsc.edu/ScienceWomen"><dc:title>Women in Science</dc:title><dc:creator dc:source="http://viaf.org/viaf/171972263/" rdfs:Literal="Laura J. Smart" /></rdf:Description></rdf:RDF>

  20. It’s the data, stupid. “We’re not dealing with records anymore. We are working with interrelated nodes of data” Diane Hillmann

  21. What does it really look like? “This is kind of like asking what electricity looks like: it doesn't so much look like anything, as it makes certain things possible” Karen Coyle

  22. Thinkbase http://thinkbase.cs.auckland.ac.nz/start.jsp

  23. Benefits of creating/using Linked Data • Sharable • Extensible • Reusable • Multi-lingual • Reduce redundancy • Improve discoverability • Sophisticated navigation

  24. Benefits of creating/using Linked Data • Enhanced publications • Facilitate research • Separate semantics from syntax • Persistent URIs an aid to digital preservation • Drive users to your site • Collaborate with less licensing hassle (LOD)

  25. All the kids are doing it “The new bibliographic framework project will be focused on the Web environment, Linked Data principles and mechanisms, and the Resource Description Framework (RDF) as a basic data model.” LC Bibliographic Framework for the Digital Age http://www.loc.gov/marc/transition/news/framework-103111.html

  26. How to? “Learn about Resource Description Framework. Never look back.” Rurik Greenall, Norwegian Institute Science & Technology Other prerequisites: HTML. URIs.

  27. Berners-Lee Basic Linked Data Principles • Use URIs as names for things • Use HTTP URIs so that people can look up those names • When someone looks up a URI, provide useful information, using the standards (RDF, SPARQL) • Include links to other URIs. so that they can discover more things.

  28. Source: Heath & Bizer http://linkeddatabook.com/editions/1.0/

  29. The process: 1st get your data Feynman, Richard Phillips, 1918-1988 LCCN: n 50002729 http://viaf.org/viaf/44298691 http://lccn.loc.gov/n50002729

  30. The process: Get your data into RDF/XML From here: To here: Robert Phillips http://lccn.loc.gov/n00014131 Creator http://purl.org/dc/terms/creator Book title http://openlibrary.org/books/OL11358296MPhysical biology of the cell

  31. The process: Expose that data

  32. Learning objectives • Define the concept of linked data • State 3 benefits of creating linked data and making it available • Outline the process of creating LD • State how to make use of LD created by others

  33. Thanks! library.caltech.edu/laura

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