Dynamic XPath

I want to create an XSLT expressions so that I can vary which nodes I
select,
I can't use [name() = $nodeName] because the depth of the path may change -
and I want to use paths not nodenames...

What I would like to do is:
	<!--<xsl:variable name="dynamicPath" select="/document/*[position()
= 2]" />-->
	<xsl:variable name="dynamicPath"
select="/document/section/keep/pear" />
	<xsl:variable name="textContent" select="{$dynamicPath}/text()" />
Which is not valid :( - so how can I create a dynamic path? Is it possible?
I'm using MSXML 4.0 under .Net

<document>
	<section>
		first section
		<keep>
			first sub-section
			<apple>
			</apple>
			<pear>
			</pear>
		</keep>
		<house sid="1.2">
			first sub-section
			<fish>
				<jumping>hello</jumping>
			</fish>
			<dog></dog>
		</house>
		<castle sid="1.3">
			first sub-section
		</castle>
	</section>
</document>


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