example.selfml

(apple
    (music
        iPod
        iTunes)
    (computers
        iMac
        [Mac mini])
    (phones
        iPhone)
    (dishwashers))

example.xml

<apple>
    <music>
        <product>iPod</product>
        <product>iTunes</product>
    </music>
    <computers>
        <product>iMac</product>
        <product>Mac mini</product>
    </computers>
    <phones>
        <product>iPhone</product>
    </phones>
    <dishwashers/>
</apple>

example.yaml

apple:
    music:
        - iPod
        - iTunes
    computers:
        - iMac
        - Mac mini
    phones:
        - iPhone
    dishwashers:

<product>iTunes Alternative</product>: iTunes Alternative
<product>Transfer iPhone Music without iTunes</product>: Transfer iPhone Music without iTunes