Counting in several levels

Hi,

a new problem:

XML:
-------------------------------------------
<case>
	<parameter>
		<status value="performed"/>
		<verdict value="fail"/>
	</parameter>
	<parameter>
		status value="performed"/>
		<verdict value="pass"/>
	</parameter>
	<parameter>
		status value="performed"/>
		<verdict value="pass"/>
	</parameter>
	<case>
		<parameter>
			<status value="performed"/>
			<verdict value="fail"/>
		</parameter>
		<parameter>
			status value="performed"/>
			<verdict value="pass"/>
		</parameter>
		<parameter>
			status value="performed"/>
			<verdict value="pass"/>
		</parameter>
	</case>
</case>


If the current node "case" is the inner node then this is working:
	<xsl:value-of select="count(parameter[status/@value='performed' and verdict/@value='pass'])" />
But if my current node is the outer node, it's not working for known reasons.

I wanna get all parameters that "performed" and "pass".

To make it more complex: I don't know how many nodes "case" are in the node "case": //case/case*/parameter

Thanks again and best regards
Sven