Serialize more than li ID's

[Christilut]

Is it currently possible to serialize more data than the id's of li's ?

For example, I have this tree:

<ol>
    <li id="item1">
        <div id="item2">
        </div>
        <div id="item3">
        </div>
    </li>
</ol>

And I want id's of both the li and div to show in the serialize output.
The documentation is not entirely clear, some parameters are not explained (such as "items").

[ilikenwf]

I don't think this is possible, currently.