[xsl] failed to find the right 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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