List<Element> els = Arrays.asList(all.get(0), all.get(1));
Builder b = at(0);
Attributes attrs = attrs("x", "1", "y", "2");
b.replaceAttributes(attrs);
b.elementStart("x", attrs("a", "1"));
b.characters("hello");
b.elementStart("y", attrs("b", "2", "c", "3"));
b.characters("yeah");
b.elementEnd();
b.elementEnd();