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failed to find the right child node

Subject: failed to find the right child node
From: "Lin, Jessica" <jlin@xxxxxxxxxxx>
Date: Tue, 29 Aug 2006 16:43:39 -0700
xsl find child node
I am trying to find out whether all channel objects are in the same
networks. Each legacy_stream has a different network_id which indicates
different
Networks. I plan to recursively check all fast_load stream, if it
contains channel object, I will increase sum of networks by 1. At the
end, I will check the sum of network, if it is larger than one, I will
assign a Boolean false value to indicate that all channels are in the
different network. Otherwise, I will assign a Boolean true value.
But, when I try to check each fast_load_stream by using  select
="//fast_load_stream[position()=$index]", it does not work. Could you
please help me to find out what's wrong in my code?


<?xml version="1.0" encoding="UTF-8"?>
<streams>
  <legacy_stream name="stream1">
    <mpt_stream>
	<apg_stream>
	  <fast_load_stream>
		<network_id>0</network_id>
		<cycle_time_seconds>4</cycle_time_seconds>
		<objects>
		   <update_list_object ref="ULO1"/>
		   <channel_object ref="CO1"/>
		   <channel_object ref="CO2"/>
		</objects>
	  </fast_load_stream>
	</apg_stream>
    </mpt_stream>
  </legacy_stream>
  <legacy_stream name="stream2">
    <mpt_stream>
	<apg_stream>
	  <fast_load_stream>
		<network_id>1</network_id>
		<cycle_time_seconds>4</cycle_time_seconds>
		<objects>
		   <update_list_object ref="ULO2"/>
		   <channel_object ref="CO3"/>
		   <channel_object ref="CO4"/>
		</objects>
	  </fast_load_stream>
	</apg_stream>
    </mpt_stream>
  </legacy_stream>
  <legacy_stream name="stream3">
    <mpt_stream>
	<apg_stream>
	  <fast_load_stream>
		<network_id>2</network_id>
		<cycle_time_seconds>4</cycle_time_seconds>
		<objects>
		   <update_list_object ref="ULO3"/>
		   <channel_object ref="CO5"/>
		   <channel_object ref="CO6"/>
		</objects>
	  </fast_load_stream>
	</apg_stream>
    </mpt_stream>
  </legacy_stream>
</streams>


Here is my xslt file. I use some xsl:value-of to print out some outputs
for debug purpose.


<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="xml" encoding="UTF-8" indent="yes" />


<xsl:template match="/">
	<xsl:call-template name="isInSameNetwork">
		<xsl:with-param name="totalNetworks"
select="count(//fast_load_stream)"/>
	</xsl:call-template>
</xsl:template>


<xsl:template name="isInSameNetwork">
	<xsl:param name="totalNetworks"/>
	<xsl:param name="index" select="1"/>
	<xsl:param name="sumNetworks" select="0"/>
	<xsl:value-of select="concat('#totalNetworks = ',
$totalNetworks, ', index = ', $index, ' sumNetworks = ',
$sumNetworks)"/>
	<xsl:variable name="fastloadStream"
select="//fast_load_stream[position()=$index]"/>
	<xsl:if test="$index &lt; $totalNetworks">
		<xsl:choose>
			<xsl:when
test="count($fastloadStream/objects/channel_object) &gt; 0" >
				<xsl:text> $has COs </xsl:text>
				<xsl:call-template
name="isInSameNetwork">
					<xsl:with-param
name="totalNetworks" select="$totalNetworks"/>
					<xsl:with-param name="index"
select="$index + 1"/>
					<xsl:with-param
name="sumNetworks" select="$sumNetworks + 1" />
				</xsl:call-template>
			</xsl:when>
			<xsl:otherwise>
				<xsl:text> $has no COs </xsl:text>
				<xsl:call-template
name="isInSameNetwork">
					<xsl:with-param
name="totalNetworks" select="$totalNetworks"/>
					<xsl:with-param name="index"
select="$index + 1"/>
					<xsl:with-param
name="sumNetworks" select="$sumNetworks" />
			    </xsl:call-template>
			</xsl:otherwise>
		</xsl:choose>
	</xsl:if>
	<xsl:choose>
		<xsl:when test="$sumNetworks &gt; 1">
			<xsl:value-of select="false()"/>
		</xsl:when>
		<xsl:otherwise>
			<xsl:value-of select="true()"/>
		</xsl:otherwise>
	</xsl:choose>
</xsl:template>

</xsl:stylesheet>

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