term = require "term"
triple = require "triple"
trp = triple.new (
    term.iriref_new("urn:s:1"),
    term.iriref_new("urn:p:1"),
    term.lit_new("hello", nil, "us-EN"))

t1 = term.iriref_new("urn:s:11")
t2 = term.lit_new("123", "xsd:int")

graph = require "graph"
gr1 = graph.new()