Proper syntax for counting all prior nodes in XPath?

Hi,

With an XML document like this:
<DOC>
	<CHAPTER>
		<SECTION>
			<PAGE>
				<LINE>Test</LINE>
				<LINE>Test 2</LINE>
			</PAGE>
		</SECTION>
		<SECTION>
			<PAGE>
				<LINE>Test 3</LINE>
			</PAGE>
		</SECTION>
	</CHAPTER>
</DOC>

How can my XSL count all the preceding nodes?  For example, when my template
is processing the <LINE>Test 3</LINE>, I want to count all nodes before it,
which would be 2 <LINE>s, 2 <PAGE>s, 2 <SECTION>s, 1 <CHAPTER>, and 1 <DOC>.
Does this make sense?

It would be something like <xsl:number level="any"
count="DOC|CHAPTER|SECTION|PAGE|LINE"/>, except I want to use the count in
an <xsl:if />, not just display it.  I have tried using <xsl:if
test="count(something)">, but I do not know what the proper "something" is.
Any suggestions?

Thanks
Jason

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