@Test public void hash3()
{

    Node x1 = NodeFactoryExtra.parseNode("<lex>");
    Node x2 = NodeFactoryExtra.parseNode("'lex'");
    Node x3 = NodeFactoryExtra.parseNode("_:lex");
    assertNotEquals(hash(x1), hash(x2));
    assertNotEquals(hash(x2), hash(x3));
    assertNotEquals(hash(x3), hash(x1));
}