# question-answering!
# run: python qa.py what is the land area of New York?

import sys
import re;
from rdflib import Graph, Namespace, Literal

dc = Namespace("http://purl.org/dc/elements/1.1/")

store = Graph();
store.parse("states.n3", None, 'n3');

m = re.search('what is the (.*) of (.*?)\??$', " ".join(sys.argv));
if m:
	term = m.group(1);
	term = term.replace(' ', '');

	entityname = m.group(2);

	# find the predicate that ends with term
	predicate = None
	for p in store.predicates() :
		if (p.lower().endswith(term.lower())) :
			predicate = p

	# find the entity whose name is given
	entity = store.value(None, dc["title"], Literal(entityname));

	if predicate == None:
		print "Predicate " + term + " not found."
	elif entity == None:
		print "Entity " + entityname + " not found."
	else :
		value = store.value(entity, predicate, None);
		print entityname + "'s " + m.group(1) + " is " + value
else :
	print "I don't understand the question."