Broken nested nodes order when taking text()

[sintro]

I am trying to achieve simple (I thought so) task. I have xml:

<title>
Hello <hlword>world</hlword>!
</title>

What I need is to convert this to string:

1. Hello world!
   Or even better if I could do something like:
2. Hello **world**!

For second option for now I am even don`t know now hot to implement this in most handy way (mostly because I am new to elixir). But even the first option became unsolvable task for me, because when I am trying to perform

doc |> xpath(~x"//title/descendant-or-self::*/text()"s) 

I get broken order of elements, something like world!Hello (can not tell exactly what order I will get in this situation, but usually this not even "reverse", but something absolutely random (but nested element is almost always going last)).
I don't know if it is sweet_xml's problem in breaking the order of gotten text() of nodes, but at least may be someone can help me in this task solving using this library.