Linked Data: Basics to Publishing and Beyond
Linked Data 101
Things, URIs, RDF, Triples, Turtle, Ontologies,
Vocabularies and SPARQL
What is Linked Data?
“Linked Data is a method of publishing structured data using standard Web
technologies such as HTTP, RDF and URIs”
Linked Data principles:
1.
U
s
e
U
R
L
s
t
o
n
a
m
e
(
i
d
e
n
t
i
f
y
)
t
h
i
n
g
s
2.
P
r
o
v
i
d
e
u
s
e
f
u
l
i
n
f
o
r
m
a
t
i
o
n
a
b
o
u
t
a
t
h
i
n
g
w
h
e
n
i
t
'
s
l
o
o
k
e
d
u
p
3.
R
e
f
e
r
t
o
o
t
h
e
r
t
h
i
n
g
s
(
u
s
i
n
g
t
h
e
i
r
U
R
L
)
w
h
e
n
p
u
b
l
i
s
h
i
n
g
d
a
t
a
o
n
t
h
e
W
e
b
Tim Berners-
Lee 2006
What is RDF?
“The Resource Description Framework (RDF) is a standard model for data
interchange on the Web”
Thing 1
Thing 2
has a relation to
Triples
In RDF all data is modeled as a triple
Subject
Object
Predicate
Triple
Triples
In RDF all data is modeled as a triple
Subject
Object
Predicate
(Property)
Triple (Statement)
Resource
Resource
RDF graphs
Multiple triples form a graph
Subject
Object /
Subject
Predicate
Triple 1
Object
Predicate
Triple 2
How do I publish my data as Linked Data?
1.
U
s
e
U
R
L
s
t
o
n
a
m
e
(
i
d
e
n
t
i
f
y
)
t
h
i
n
g
s
2.
P
r
o
v
i
d
e
u
s
e
f
u
l
i
n
f
o
r
m
a
t
i
o
n
a
b
o
u
t
a
t
h
i
n
g
w
h
e
n
i
t
'
s
l
o
o
k
e
d
u
p
3.
R
e
f
e
r
t
o
o
t
h
e
r
t
h
i
n
g
s
(
u
s
i
n
g
t
h
e
i
r
U
R
L
)
w
h
e
n
p
u
b
l
i
s
h
i
n
g
d
a
t
a
o
n
t
h
e
W
e
b
1.
Use URLs to name (identify) things
I like pizza
1.
Use URLs to name (identify) things
I
pizza
like
1.
Use URLs to name (identify) things
I
pizza
like
http://orcid.org/0000-0002-7633-1442
1.
Use URLs to name things
Is there already a URL for “pizza”?
Let’s search for it!
I
pizza
like
http://orcid.org/0000-0002-7633-1442
http://www.swoogle.umbc.edu
1.
Use URLs to name things
Is there already a URL for “pizza”?
Let’s search for it!
I
pizza
like
http://orcid.org/0000-0002-7633-1442
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
http://www.swoogle.umbc.edu
1.
Use URLs to name things
What URL can we use for “like”? Swoogle doesn’t propose one..
I
pizza
like
http://orcid.org/0000-0002-7633-1442
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
1.
Use URLs to name things
Can’t find a URL? Create one yourself!
I
pizza
http://www.mysite.com/myOntology#like
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
http://orcid.org/0000-0002-7633-1442
like
How do I publish my data as Linked Data?
1.
U
s
e
U
R
L
s
t
o
n
a
m
e
(
i
d
e
n
t
i
f
y
)
t
h
i
n
g
s
2.
P
r
o
v
i
d
e
u
s
e
f
u
l
i
n
f
o
r
m
a
t
i
o
n
a
b
o
u
t
a
t
h
i
n
g
w
h
e
n
i
t
'
s
l
o
o
k
e
d
u
p
3.
R
e
f
e
r
t
o
o
t
h
e
r
t
h
i
n
g
s
(
u
s
i
n
g
t
h
e
i
r
U
R
L
)
w
h
e
n
p
u
b
l
i
s
h
i
n
g
d
a
t
a
o
n
t
h
e
W
e
b
2. Provide useful information about a thing when it's looked up
What do these URLs resolve to?
I
pizza
http://www.mysite.com/myOntology#like
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
http://orcid.org/0000-0002-7633-1442
like
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
pizza
food
Italy
subClassOf
hasCountryOfOrigin
2. Provide useful information about a thing when it's looked up
You get information about the “thing” the URL represents (in RDF!)
O
n
t
o
l
o
g
y
http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
pizza
food
Italy
subClassOf
hasCountryOfOrigin
2. Provide useful information about a thing when it's looked up
http://www.wikidata.org/entity/Q38
O
n
t
o
l
o
g
y
Ontologies typically contain detailed class hierarchy information as
well as other relationships of interest to the “thing”
http://www.wikidata.org/entity/Q38
2. Provide useful information about a thing when it's looked up
“Italy” @ en
“
Italië” @ nl
“義大利” @ zh
“Итали” @ru
Italy
prefLabel
“Italian Republic” @ en
altLabel
V
o
c
a
b
u
l
a
r
y
Vocabularies typically focus on
the representation of the “thing”
in different natural languages
How do I publish my data as Linked Data?
1.
U
s
e
U
R
L
s
t
o
n
a
m
e
(
i
d
e
n
t
i
f
y
)
t
h
i
n
g
s
2.
P
r
o
v
i
d
e
u
s
e
f
u
l
i
n
f
o
r
m
a
t
i
o
n
a
b
o
u
t
a
t
h
i
n
g
w
h
e
n
i
t
'
s
l
o
o
k
e
d
u
p
3.
R
e
f
e
r
t
o
o
t
h
e
r
t
h
i
n
g
s
(
u
s
i
n
g
t
h
e
i
r
U
R
L
)
w
h
e
n
p
u
b
l
i
s
h
i
n
g
d
a
t
a
o
n
t
h
e
W
e
b
3. Refer to other things
For example: who do I know?
I
pizza
http://orcid.org/0000-0002-7633-1442
like
knows
Rajaram
http://orcid.org/0000-0002-1215-167X
How to represent RDF?
<http://orcid.org/0000-0002-7633-1442>
<http://www.mysite.com/myOntology#like>
<http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza>.
I
pizza
like
n
-
t
r
i
p
l
e
s
@prefix orcid: <http://orcid.org/> .
@prefix mo: <http://www.mysite.com/myOntology/> .
@prefix po: <http://protege.stanford.edu/ontologies/pizza/pizza.owl#> .
orcid:0000-0002-7633-1442 mo:like po:Pizza .
I
pizza
like
How to represent RDF?
T
u
r
t
l
e
I
pizza
like
How to represent RDF?
R
D
F
/
X
M
L
How can I query RDF?
Who does Rajaram know that likes pizza?
select * where {?person mo:like po:Pizza .
?person foaf:knows orcid:0000-0002-1215-
167X
}
I
pizza
like
knows
Raja-
ram
S
P
A
R
Q
L
/
T
r
i
p
l
e
S
t
o
r
e
How can I query RDF?
Who does Rajaram know that likes pizza?
select * where {?person mo:like po:Pizza ;
foaf:knows orcid:0000-0002-
1215-167X
}
I
pizza
like
knows
Raja-
ram
S
P
A
R
Q
L
/
T
r
i
p
l
e
S
t
o
r
e
Linked Data is our Implementation choice for FAIR
Delve into the world of Linked Data with topics ranging from its fundamental principles like URIs, RDF, and Triples to practical aspects like publishing data using standard web technologies such as HTTP. Explore the essence of RDF graphs, the significance of naming things with URLs, and ways to provide valuable information while referencing related entities in the Linked Data ecosystem.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
Linked Data 101 Things, URIs, RDF, Triples, Turtle, Ontologies, Vocabularies and SPARQL
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: 1.Use URLs to name (identify) things 2.Provide useful information about a thing when it's looked up 3.Refer to other things (using their URL) when publishing data on the Web
What is RDF? The Resource Description Framework (RDF) is a standard model for data interchange on the Web has a relation to Thing 1 Thing 2
Triples In RDF all data is modeled as a triple Predicate Subject Object Triple
Triples In RDF all data is modeled as a triple Resource Resource Predicate (Property) Subject Object Triple (Statement)
RDF graphs Multiple triples form a graph Object Predicate Object / Subject Subject Triple 1
How do I publish my data as Linked Data? 1.Use URLs to name (identify) things 2.Provide useful information about a thing when it's looked up 3.Refer to other things (using their URL) when publishing data on the Web
1.Use URLs to name (identify) things I like pizza
1.Use URLs to name (identify) things like I pizza
1.Use URLs to name (identify) things http://orcid.org/0000-0002-7633-1442 like I pizza
http://www.swoogle.umbc.edu 1.Use URLs to name things Is there already a URL for pizza ? Let s search for it! http://orcid.org/0000-0002-7633-1442 like I pizza
http://www.swoogle.umbc.edu 1.Use URLs to name things Is there already a URL for pizza ? Let s search for it! http://orcid.org/0000-0002-7633-1442 like I pizza http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
1.Use URLs to name things What URL can we use for like ? Swoogle doesn t propose one.. http://orcid.org/0000-0002-7633-1442 like I pizza http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
1.Use URLs to name things Can t find a URL? Create one yourself! http://www.mysite.com/myOntology#like http://orcid.org/0000-0002-7633-1442 like I pizza http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
How do I publish my data as Linked Data? 1.Use URLs to name (identify) things 2.Provide useful information about a thing when it's looked up 3.Refer to other things (using their URL) when publishing data on the Web
2. Provide useful information about a thing when it's looked up What do these URLs resolve to? http://www.mysite.com/myOntology#like http://orcid.org/0000-0002-7633-1442 like I pizza http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza
2. Provide useful information about a thing when it's looked up http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza You get information about the thing the URL represents (in RDF!) Ontology food subClassOf hasCountryOfOrigin pizza Italy
2. Provide useful information about a thing when it's looked up http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza Ontologies typically contain detailed class hierarchy information as well as other relationships of interest to the thing Ontology food http://www.wikidata.org/entity/Q38 subClassOf hasCountryOfOrigin pizza Italy
2. Provide useful information about a thing when it's looked up http://www.wikidata.org/entity/Q38 Vocabularies typically focus on the representation of the thing in different natural languages Italy @ en Itali @ nl prefLabel @ zh @ru Italy Italian Republic @ en altLabel Vocabulary
How do I publish my data as Linked Data? 1.Use URLs to name (identify) things 2.Provide useful information about a thing when it's looked up 3.Refer to other things (using their URL) when publishing data on the Web
3. Refer to other things For example: who do I know? http://orcid.org/0000-0002-7633-1442 like I pizza knows Rajaram http://orcid.org/0000-0002-1215-167X
How to represent RDF? like I pizza <http://orcid.org/0000-0002-7633-1442> <http://www.mysite.com/myOntology#like> <http://protege.stanford.edu/ontologies/pizza/pizza.owl#Pizza>. n-triples
How to represent RDF? like I pizza @prefix orcid: <http://orcid.org/> . @prefix mo: <http://www.mysite.com/myOntology/> . @prefix po: <http://protege.stanford.edu/ontologies/pizza/pizza.owl#> . orcid:0000-0002-7633-1442 mo:like po:Pizza . Turtle
How to represent RDF? like I pizza RDF/XML
How can I query RDF? like I pizza Who does Rajaram know that likes pizza? knows Raja- ram select * where { ?person mo:like po:Pizza . ?person foaf:knows orcid:0000-0002-1215- 167X } SPARQL / Triple Store
How can I query RDF? like I pizza Who does Rajaram know that likes pizza? knows Raja- ram select * where { ?person mo:like po:Pizza ; foaf:knows orcid:0000-0002- 1215-167X } SPARQL / Triple Store
