b.appendChild(x3);
x2.appendChild(doc.createTextNode("2"));
x3.appendChild(doc.createTextNode("3"));
x4.appendChild(doc.createTextNode("4"));
List result = xpath.selectNodes(doc);
assertEquals(4, result.size());
assertEquals(x1, result.get(0));
assertEquals(x2, result.get(1));
assertEquals(x3, result.get(2));
assertEquals(x4, result.get(3));