Question

I am having trouble finding a clear, sensible example of usage of context with rdflib. ConjunctiveGraph does not accept contexts, and Graph is deprecated. How am I supposed to create and operate on different contexts within the same global ConjunctiveGraph ?

Answer 1

Yes. This is the code

import rdflib
from rdflib.Graph import Graph

conj=rdflib.ConjunctiveGraph()

NS=rdflib.Namespace("http://example.com/#")
NS_CTX=rdflib.Namespace("http://example.com/context/#")

alice=NS.alice
bob=NS.bob
charlie=NS.charlie

pizza=NS.pizza
meat=NS.meat
chocolate=NS.chocolate

loves=NS.loves
hates=NS.hates
likes=NS.likes
dislikes=NS.dislikes

love_ctx=Graph(conj.store, NS_CTX.love)
food_ctx=Graph(conj.store, NS_CTX.food)

love_ctx.add( (alice, loves, bob) )
love_ctx.add( (alice, loves, charlie) )
love_ctx.add( (bob, hates, charlie) )
love_ctx.add( (charlie, loves, bob) )

food_ctx.add( (alice, likes, chocolate) )
food_ctx.add( (alice, likes, meat) )
food_ctx.add( (alice, dislikes, pizza) )

print "Full context"
for t in conj:
    print t

print ""
print "Contexts"
for c in conj.contexts():
    print c

print "love context"
for t in love_ctx:
    print t

print "food context"
for t in food_ctx:
    print t

And this is the output

Full context
(rdflib.URIRef( http://example.com/#bob ), rdflib.URIRef( http://example.com/#hates ), rdflib.URIRef( http://example.com/#charlie ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#likes ), rdflib.URIRef( http://example.com/#chocolate ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#likes ), rdflib.URIRef( http://example.com/#meat ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#dislikes ), rdflib.URIRef( http://example.com/#pizza ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#bob ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#charlie ))
(rdflib.URIRef( http://example.com/#charlie ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#bob ))

Contexts
<http://example.com/context/#food> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label  IOMemory ].
<http://example.com/context/#love> a rdfg:Graph;rdflib:storage [a rdflib:Store;rdfs:label  IOMemory ].
love context
(rdflib.URIRef( http://example.com/#bob ), rdflib.URIRef( http://example.com/#hates ), rdflib.URIRef( http://example.com/#charlie ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#bob ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#charlie ))
(rdflib.URIRef( http://example.com/#charlie ), rdflib.URIRef( http://example.com/#loves ), rdflib.URIRef( http://example.com/#bob ))
food context
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#likes ), rdflib.URIRef( http://example.com/#chocolate ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#likes ), rdflib.URIRef( http://example.com/#meat ))
(rdflib.URIRef( http://example.com/#alice ), rdflib.URIRef( http://example.com/#dislikes ), rdflib.URIRef( http://example.com/#pizza ))

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