Examples from the lectures

This page contains code examples from the lectures.

S02

from inspect import formatargspec
from rdflib import Graph, Literal, RDF, FOAF, Namespace

g = Graph()

EX = Namespace('http://ex.org/')

g.add((EX.Bob, RDF.type, FOAF.Person))
g.add((EX.Alice, RDF.type, FOAF.Person))
g.add((EX.Carol, RDF.type, FOAF.Person))
g.add((EX.Bob, FOAF.knows, EX.Alice))
g.add((EX.Bob, FOAF.knows, EX.Carol))

g.add((EX.Bob, FOAF.name, Literal('Bob')))
g.add((EX.Alice, FOAF.name, Literal('Alice')))
g.add((EX.Carol, FOAF.name, Literal('Carol')))

g.namespace_manager.bind('ex', EX)

print(g.serialize(format='json-ld'))

for p, o in g[ EX.Bob : : ]:
    print(p, o)


g2 = Graph()
g2.parse('https://www.wikidata.org/entity/Q935079.ttl')
print(g2.serialize())

S03

from rdflib import Graph, Namespace

REX = Namespace('http://example.org/royal#')

g = Graph()
g.parse('family.ttl', format='ttl')
res = g.query("""
    CONSTRUCT {
        ?child fam:aunt ?aunt .
    } WHERE {
        ?child fam:hasParent / fam:hasSister ?aunt .
    }
""",
    initNs={
        'fam': 'http://example.org/family#'
    },
    initBindings={
        'child': REX.SverreMagnus
    })

S04