Part 1 of a Linked Data Workshop for library staff at University of Oregon and Oregon State University Libraries.

1. Linked Data Principles
Oregon Digital Linked Data
Workshop, Eugene, Oregon
November 25, 2013
Tom Johnson thomas.
johnson@oregonstate.edu

2. 4 Principles
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those names.
3. When someone looks up a URI, provide useful
information, using the standards (RDF*, SPARQL)
4. Include links to other URIs. so that they can discover
more things.

3. Subject, Predicate, Object
Subject
Predicate
<http://example.
org/object1>
<http://purl.org/dcterms/title>
<http://example.
org/object1>
<http://purl.org/dcterms/isPartOf>
Object
“Example Title”
<http://example.
org/collection1>

4. What is a Graph?

5. Data Model Example

6. Serializing
N-Triples:
<http://example.org/1> <http://purl.org/dcterms/title> “Comet in Moominland”@en .
<http://example.org/1> <http://purl.org/dcterms/title> “Mumintrollet på kometjakt”@sv .
<http://example.org/1> <http://purl.org/dcterms/creator> <http://example.
org/person/tjannson> .
<http://example.org/1> <http://purl.org/dcterms/subject> <http://id.loc.
gov/authorities/subjects/sh2001004219> .
<http://id.loc.gov/authorities/subjects/sh2001004219> <http://www.w3.
org/2004/02/skos/core#prefLabel> "Moomins (Fictitious characters)"@en .
<http://example.org/person/tjannson> <http://xmlns.com/foaf/0.1/name> “Tove Jansson” .

7. Serializing
Turtle
ex:1 dc:title “Comet in Moominland”@en,
“Mumintrollet på kometjakt”@sv ;
dc:creator ex:person/tjansson ;
dc:subject lcsh:sh2001004219 .
ex:person/tjansson foaf:name “Tove Jansson” .
lcsh:sh2001004219 skos:prefLabel "Moomins (Fictitious
characters)"@en .

8. Practical Semantics
➢ Hierarchical Metadata Terms
⇒ relationships between vocabularies
⇒ e.g. mrel:photographer < dc:contributor
➢ Domain and Range Statements
⇒ Limit vocabulary application for data quality and
interoperability
➢ Objects in one statement can be subjects in
others.

9. Global Scale
➢ Statement-centric
➢ Model is “Open World”
⇒ Data we don’t have is assumed to be unknown
locally, not globally.
➢ Outside data is valued
➢ Linking is web scale

10. Resources
➢ Linked Open Vocabularies (vocabulary search engine)
http://lov.okfn.org/dataset/lov/
➢ W3C Library Linked Data Incubator Group Reports http:
//www.w3.org/2005/Incubator/lld/
➢ Open Metadata Registry (hosts RDA vocabularies) http:
//metadataregistry.org/

11. Questions/Discussion
Challenges from readings?
Questions about why & how?
Observations?