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

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. 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. 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. 1.
Discussion #1 Topics

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. 2.
First,
the Semantic Web

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. 3.
Now,
Linked Data Principles

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. 4.
Finally,
RDF & Triples

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. 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. 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. Linked Open Data Cloud, September 2011

15. 4.
Hands on
Activity

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. EXAMPLE
Metadata
librarian
Itza
scooter
coffee cats
works as
drinks
likes
drives

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. 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