final Node child = new Node();
child.setId("ID");
child.setSid("SID");
oldElements.add(child);
elements.addAll(0, oldElements);
assertSame(document, child.getDocument());
assertSame(parent, child.getParent());
assertSame(child, document.getById("ID"));
assertSame(child, document.getBySid("SID"));
assertSame(child, parent.getBySid("SID"));