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 ?
A:
I don't know much about this, but there is a library that you can install called matplotlib. Maybe you could give that a shot.
Hope this helps
inspectorG4dget
2009-11-24 05:51:43
I am talking about mathematical networks, not plots
Stefano Borini
2009-11-24 05:52:49
A:
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'))
Stefano Borini
2009-11-24 06:06:22