1. Linked Data 101
Things, URIs, RDF, Triples, Turtle, Ontologies, Vocabularies and SPARQL
Linked Data is our Implementation choice for FAIR

2. What is Linked Data?
Tim Berners-Lee 2006
“Linked Data is a method of publishing structured data using standard Web technologies such as HTTP, RDF and URIs”
Linked Data principles:
Use URLs to name (identify) things
Provide useful information about a thing when it's looked up
Refer to other things (using their URL) when publishing data on the Web
URL is unique: disambiguation

3. What is RDF?
“The Resource Description Framework (RDF) is a standard model for data interchange on the Web”
Thing 1
has a relation to
Thing 2

4. Triples In RDF all data is modeled as a triple Subject Predicate
Object
Triple

5. Triples In RDF all data is modeled as a triple Resource Resource
Predicate (Property)
Subject
Object
Triple (Statement)

6. RDF graphs Multiple triples form a graph Object Predicate Predicate
Subject
Predicate
Object / Subject
Triple 2
Triple 1

7. How do I publish my data as Linked Data?
Use URLs to name (identify) things
Provide useful information about a thing when it's looked up
Refer to other things (using their URL) when publishing data on the Web

8. Use URLs to name (identify) things
I like pizza

9. Use URLs to name (identify) things
like
pizza

10. Use URLs to name (identify) things I
like
pizza

11.
Use URLs to name things
Is there already a URL for “pizza”? Let’s search for it! I
like
pizza
interoperability!

12.
Use URLs to name things
Is there already a URL for “pizza”? Let’s search for it! I
like
pizza
interoperability!

13. Use URLs to name things
What URL can we use for “like”? Swoogle doesn’t propose one.. I
like
pizza
interoperability!

14. Use URLs to name things Can’t find a URL? Create one yourself! I
like
pizza
Others can use that definition

15. How do I publish my data as Linked Data?
Use URLs to name (identify) things
Provide useful information about a thing when it's looked up
Refer to other things (using their URL) when publishing data on the Web
URL unique: disambiguation..

16. 2. Provide useful information about a thing when it's looked up
What do these URLs resolve to? I
like
pizza

17. 2. Provide useful information about a thing when it's looked up
You get information about the “thing” the URL represents (in RDF!)
food
Ontology
subClassOf
pizza
hasCountryOfOrigin
Italy
URLs for classes?

18. 2. Provide useful information about a thing when it's looked up
Ontologies typically contain detailed class hierarchy information as well as other relationships of interest to the “thing”
Ontology
food
subClassOf
pizza
hasCountryOfOrigin
Italy

19. 2. Provide useful information about a thing when it's looked up
Vocabularies typically focus on the representation of the “thing” in different natural languages en nl zh
prefLabel
Italy
“Italian en
altLabel
Opaque URLs
Vocabulary

20. How do I publish my data as Linked Data?
Use URLs to name (identify) things
Provide useful information about a thing when it's looked up
Refer to other things (using their URL) when publishing data on the Web

21. 3. Refer to other things For example: who do I know? I
like
pizza
knows
Rajaram
Open world assumption..

22. How to represent RDF? n-triples
like
pizza
< < <
n-triples

23. How to represent RDF? TurtleI
like
pizza
@prefix orcid: < . @prefix mo: < . @prefix po: < orcid: mo:like po:Pizza .
Turtle

24. How to represent RDF? I
like
pizza
Applications!
RDF/XML

25. How can I query RDF? SPARQL / Triple Store
like
pizza
Who does Rajaram know that likes pizza?
select * where { ?person mo:like po:Pizza . ?person foaf:knows orcid: X }
knows
Raja-ram
Applications
SPARQL / Triple Store

26. How can I query RDF? SPARQL / Triple Store
like
pizza
Who does Rajaram know that likes pizza?
select * where { ?person mo:like po:Pizza ; foaf:knows orcid: X }
knows
Raja-ram
Applications
SPARQL / Triple Store