Indesign Javascript and xml structure

Hi to all

I am new to program javascript in Indesign, and I am looking for some example on how modify the xml structure inside a document using a javascript script.

i.e.

if I have a structure like this in the original document:

root

section

tag1

tag2

tag3

I need to transform it in this way( this is just an example, may be more complex):

root

     section

          tag1

          tag2

          tag3

Any help on where or how to solve this is very appreciate.

Thanks a lot