# As a note, this program actually takes a few minutes to run.
# Don't take that as a general problem with RDF though!

from rdflib import Graph, Namespace, Literal

# Define some namespaces

rdf = Namespace("http://www.w3.org/1999/02/22-rdf-syntax-ns#");
dc = Namespace("http://purl.org/dc/elements/1.1/")
foaf = Namespace("http://xmlns.com/foaf/0.1/");
time = Namespace("http://pervasive.semanticweb.org/ont/2004/06/time#");

census = Namespace("tag:govshare.info,2005:rdf/census/")
usgovt = Namespace("tag:govshare.info,2005:rdf/usgovt/");
pol = Namespace("tag:govshare.info,2005:rdf/politico/");

# Create a store to hold RDF data

store = Graph();

# Load the N3 file with the states data

store.parse("states.n3", None, 'n3');
store.parse("people.rdf", None, 'xml');
store.parse("orgs.rdf", None, 'xml');

# Loop through every statement in the graph of the form
# ( ____ rdf:type usgovt:State).

maxpop = 0
maxstate = None;

for statement in store.triples((None, rdf["type"], usgovt["State"])):
	state = statement[0] # the subject of the statement
	population = int(store.value(state, census["population"], None))
	if (population > maxpop) :
		maxpop = population
		maxstate = state

print maxpop
print maxstate

for office in store.subjects(pol["represents"], maxstate) :
	for role in store.subjects(pol["forOffice"], office) :
		enddate1 = store.value(role, time["to"], None) ;
		enddate2 = store.value(enddate1, time["at"], None) ;
		if (str(enddate2) > "2006-03-27") :
			for person in store.subjects(pol["hasRole"], role) :
				print store.value(person, foaf["name"], None) ;