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Introduction to Linked Data - Part 1

As part of a 5 series discussion, this informal learning group discussion focused on the overview of Semantic web and an introduction to Linked Data principles. Additionally participants received an  overview of the foundations of triple statement. Instructor then led a hands on triple statement activity

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Introduction to Linked Data - Part 1

  1. 1. Introduction to Linked Data Discussion #1 | University of Texas at Austin | August 13, 2018 Facilitated by: Itza A. Carbajal, LLILAS Benson Latin American Metadata Librarian
  2. 2. Hello! My name is Itza A. Carbajal I will be facilitating this discussion series on Linked Data I am the Latin American Metadata Librarian for a Post Custodial project at LLILAS Benson Have questions? Email me at: i.carbajal@austin.utexas.edu Like twitter? You can find me at: @archiviststan
  3. 3. Housekeeping ◎ Discussions are meant to highlight collective wisdom of the group ◎ Attendance to all discussion meetings not required, but recommended ◎ Take home practices are not required, but encouraged to further an individual’s understanding ◎ Readings are not required, but should be considered as a method for self education or for sharing with others Link to LIVE syllabus: http://bit.ly/SYLLABUSUTLD Link to reading materials: http://bit.ly/READUTLD
  4. 4. 1. Discussion #1 Topics
  5. 5. Topics to Discuss ◎ Semantic Web ◎ Linked data principles ◎ RDF and Triple statements Related Topics not covered in discussions ◎ Linked Open Data ◎ Examples of linked open data sets ◎ Linked Data platform
  6. 6. 2. First, the Semantic Web
  7. 7. Semantic Web (project) ◎ Derives from the concept of semantics defined as the study of meanings ◎ Extension to the current World Wide Web ◎ Also known as Web 3.0 where the web can now “read-write-execute” ◎ Changes the current web of information to a web of data including data inside the web and outside ◎ Core functions include semantic markup ○ Semantic markup - data interchange formats accessible to humans and machine ◎ Focuses on adding meaning/context to information giving machines and humans the ability to communicate and cooperate ◎ Relies on machine-readable metadata to expresses that meaning/context ◎ No formal definition, still ongoing and constantly maturing
  8. 8. 3. Now, Linked Data Principles
  9. 9. Linked Data Principles (as noted by Tim Berners-Lee) ◎ Use Uniform Resource Identifiers (URIs) as names for things ○ URIs are assigned to resources to provide persistency and flexibility and are ideally independent of underlying location ◎ Use HTTP URIs so that people can look up those names ○ URIs are formed using the Hypertext Transfer Protocol (HTTP) ◎ When someone looks up a URIs, linked data should provide useful information using the standards (RDF, SPARQL) ◎ Include links to other URIs, so that people can discover more things
  10. 10. 4. Finally, RDF & Triples
  11. 11. Resource Description Framework (RDF) ◎ Common framework model that uses multiple technologies to implement linked data principles on the semantic web using statements ◎ Expresses linked data by specifying relationships between things thus sharing information in the web and those not directly found on the web ◎ These relationships help humans and machine navigate between or integrate information from different and multiple sources ◎ Supports changes to schemas without drastic changes to the data ◎ Allows for structures and semi-structured data to combined, exposed, and shared across the web and online applications ◎ Uses a variety of syntax notations and data serializations such as Turtle, Notation 3 (N3), RDF/XML, and JSON-LD, RDFa, and N-Triples (the list continues to grow and decisions on use depend on the intent)
  12. 12. Semantic Triple ◎ Also referred to as simply a triple or triple statement ◎ Data entity and the building block of RDF ◎ Comprised of SUBJECT -- PREDICATE -- OBJECT ○ think three equals a triple ◎ A collection of triples is stored in a database called a Triplestore ○ use semantic queries with the query language of SPARQL to retrieve triples subject predicate object
  13. 13. RDF Graph ◎ Visual element of RDF ◎ Is a technology used in generating visual RDF statements ◎ Can represent a set of triples (think 2 sets or 1000s) ◎ Of the triple elements ○ Subjects and objects are called nodes ○ Predicates represent the arch (connection between subject and object) with arrow point from subject to object
  14. 14. Linked Open Data Cloud, September 2011
  15. 15. 4. Hands on Activity
  16. 16. “ Consider yourself a “resource” with your name as the URI. How would you create a triple statement using the resource (your identity) as the subject to describe yourself?
  17. 17. EXAMPLE Metadata librarian Itza scooter coffee cats works as drinks likes drives
  18. 18. WRAP UP Discussion #2 Details DATE: August 27, 2018 TIME: 9:30 am PLACE: PCL 1.340 Link to LIVE syllabus: http://bit.ly/SYLLABUSUTLD TAKE HOME PRACTICE: Create triple statement(s) using the designated “Resource” as the subject
  19. 19. Allemang, Dean & Hendler, Jim. (2011). Semantic Web for the Working Ontologist. 2nd ed. Amsterdam: Elsevier. Berners-Lee, Tim. Architecture. World Wide Web Consortium. Downloaded July 28, 2018 from: http://www.w3.org/2000/Talks/1206-xml2k-tbl/slide10-0.html Hart, Glen & Dolbear, Catherine. (2013). Linked Data: A Geographic Perspective. Boca Raton: CRC Press. Klyne, Glenn & Carroll, Jeremy J.(editors). Resource Description Framework (RDF): Concepts and Abstract Syntax. Copyright 2004 World Wide Web Consortium, (Massachusetts Institute of Technology, European Research Consortium for Informatics and Mathematics, Keio University). Accessed July 28, 2018 from http://www.w3.org/Consortium/Legal/2002/copyright-documents-20021231 Tauberer, Joshua. (2008, January). What is RDF and what is it good for? Downloaded July 28, 2018 from http://www.rdfabout.com/intro/ . W3C. Schreiber, Guus & Raimond (editors). RDB 1.1 Primer. Downloaded July 28, 2018 from http://www.w3.org/TR/rdf11-primer/ . "W3C Semantic Web Frequently Asked Questions." Extensible Markup Language (XML) 1.0 (Fifth Edition). November 12, 2009. Accessed August 6, 2018. https://www.w3.org/RDF/FAQ. References