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