XSL looping against nodes

i need to create a XSLT that could manage two differnts forms like the following ones:

<form>
<requestor>rqu </requestor>
<pp1>pepe1<pp2>

</form>

<form>
<requestor>rqu </requestor>
<pp1>pepe1<pp1>
    <pp2>pepe2<pp2>
</form>

The idea is to loop between all the nodes and output the information as following:

for first example

requestor -> rqu

pp1 -> pepe1

second example

requestor -> rqu

pp1 -> pepe1

pp2 -> pepe 2

Is an easy question but i dont know how to obtain the node name and loop nodes, i was searching and i didnt get nothing related...