<data>
	<row>
		<level>40</level>
		<keycode>1254.45.12</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.7</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.8</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.9</keycode>
	</row>

	<row>
		<level>40</level>
		<keycode>99.25.6</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>99.25.6.45</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>99.25.6.46</keycode>
	</row>
</data>

What could be the XPath expression to get the maximum number of nodes of
level=50 in data those keycode starts like the level=40 line ?
Here the answer would be 3 as the maximum number of level = 50 nodes for
a given level = 40 is 3

<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="2.0">

  <xsl:param name="l1" select="'50'"/>
  <xsl:param name="l2" select="'40'"/>

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/