The latest instance of the course can be found at: Semantic Web: 2026 MOOC
Presenting RDF graphs¶
In these exercises we will learn to use different serializations of RDF graphs.
Here is an example of a visualized RDF graph.
First, we will familiarize ourselves with the simplest serialization N-triples
A+ presents the exercise submission form here.
Visualizing a Turtle serialization¶
Next in line is the more convenient Turtle format.
Visualize the below RDF Turtle definitions using the RDF Grapher service. Notice the empty prefix.
@prefix : <http://esimerkki.fi/> .
:matti a :Person ;
:name "Matti" ;
:knows :maija ;
:hasChild :liisa .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix ex: <http://esimerkki.fi/> .
ex:matti a foaf:Person ;
foaf:name "Matti" ;
foaf:knows ex:maija ;
ex:hasChild ex:liisa .
ex:maija a foaf:Person ;
foaf:name "Maija" .
ex:liisa a foaf:Person ;
foaf:name "Liisa" .
foaf:Person rdfs:label "Henkilö"@fi .
Presenting RDF graphs in the Turtle notation¶
Serialize the RDF graph given in the above image in the Turtle format. You may want to validate it by visualizing it in the RDF Grapher service before submitting. Boxes with blue borders represent resources and boxes with black borders represent literals.
The prefix dc points to Dublin Core namespace http://purl.org/dc/elements/1.1/
and rdf to the RDF namespace http://www.w3.org/1999/02/22-rdf-syntax-ns#.
Use the same empty prefix as in the previous examples: @prefix : <http://esimerkki.fi/> .
A+ presents the exercise submission form here.
Converting Turtle serialization to RDF/XML¶
Convert the previous exercise’s RDF graph from Turtle to RDF/XML serialization by using the RDF Serializer service of the LDF.fi portal.
A+ presents the exercise submission form here.
JSON-LD notation¶
JSON-LD is a W3C standardized, JSON-based format to serialize Linked Data. Look through the video
- which lays out the idea and essential properties of JSON-LD. A more in-depth description can be found from the following sources: