Relational tables to tree hierarchy. How?

Hello.

I think there should be a basic component for this but I just can't manage to find it.

If I have two related lists (like tables in a relational database) how can i transform them into a datatree hierarchy.

Imagine this scenario:

Given a list of objects (selection) I create two other lists one width each object layer the other with object name.

I would like to create a hierarchic structure (a tree I suppose) to store this information and eventually save it to a xml file (I think there is a component for serializing a tree to xml right? in gHwol?)

The tables of course would be related by index number.

Is there a component to map these two list into a tree?

Thanks