moving thru nodes

Can anyone please tell whether I can get out of a node once I'm into it?!
eg:

<one>
	<two>
		<three>
			<four/>
		</three>
	</two>
	<five>
		<six>
			<seven/>
		</six>
	</five>
</one>

if I was in two, how can I get into six?
does this 
parent::one/five/six
mean I go to the node or just refering to that node?

Thanx


Rosa

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