Tweak xsl to eliminate duplicate data and blank lines

[Luke Airig]

I am trying to merge two xml files based on common date/time and then
write out a tab-delimited xml file with the header record from one of
the input files concatenated in front of the merged detail records in
the output file. The version I have is close to what I need except it
concatenates two sets of header records in front of each merged detail
record and the first two lines in the file and the last line is blank.

Can someone please tell me how to tweak the xsl stylesheet to get rid
of the duplicate concatenated header fields and the blank lines?

Here are the xsl and xml files:

merge_lrv_gps_a nd_trans_to_tab _delim.xsl:
-----------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<xsl:styleshe et version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:variable name="delim" select="'&#x9;' "/> <!-- tab -->
<xsl:variable name="nl" select="'&#xA;' "/> <!-- newline -->
<xsl:variable name="head">
<xsl:for-each select="/root/header/*">
<xsl:value-of select="concat( ., $delim)"/>
</xsl:for-each>
</xsl:variable>

<xsl:template match="/root/record">
<!--note: if lrv_gps.xml is in a different directory, you will
need to use the relative path or URL-->
<xsl:variable name="gps"
select="documen t('lrv_gps.xml' )/root/record[date_time =
current()/date_time]"/>
<xsl:value-of select="$head"/>
<xsl:value-of select="concat( $gps/longitude, $delim,
$gps/latitude, $delim)"/>
<xsl:for-each select="*">
<xsl:value-of select="concat( ., $delim)"/>
</xsl:for-each>
</xsl:template>

<!--this empty template is to stop the header values from printing at
top of page-->
<xsl:template match="header">
</xsl:template>

</xsl:stylesheet>
lrv_gps.xml:
------------
<?xml version="1.0"?>
<root>
<record>
<longitude>-105.111111</longitude>
<latitude>39.11 1111</latitude>
<date_time>20 03/12/10.16:08</date_time>
</record>
<record>
<longitude>-105.222222</longitude>
<latitude>39.22 2222</latitude>
<date_time>20 03/12/10.16:18</date_time>
</record>
<record>
<longitude>-105.111111</longitude>
<latitude>39.11 1111</latitude>
<date_time>20 03/12/10.16:28</date_time>
</record>
<record>
<longitude>-105.111111</longitude>
<latitude>39.11 1111</latitude>
<date_time>20 03/12/10.17:08</date_time>
</record>
<record>
<longitude>-105.222222</longitude>
<latitude>39.22 2222</latitude>
<date_time>20 03/12/10.17:18</date_time>
</record>
<record>
<longitude>-105.111111</longitude>
<latitude>39.11 1111</latitude>
<date_time>20 03/12/10.17:28</date_time>
</record>
</root>

lrv_trans.xml:
--------------
<?xml version="1.0"?>
<root>
<header>
<driver_id>driv er_id_from_tran s</driver_id>
<vehicle_id>veh icle_id_from_tr ans</vehicle_id>
<duty_shift_id> duty_shift_id_f rom_trans</duty_shift_id>
<route_id>route _id_from_trans</route_id>
<cid_terminal_i d>cid_terminal_ id_from_trans</cid_terminal_id >
</header>
<record>
<date_time>20 03/12/10.16:08</date_time>
<tag_id>tag_id_ from_trans_1</tag_id>
<stop_location_ id>stop_locatio n_id_from_trans _1</stop_location_i d>
<fare_type_cd>f are_type_cd_fro m_trans_1</fare_type_cd>
<blacklist_cd>b lacklist_cd_fro m_trans_1</blacklist_cd>
</record>
<record>
<date_time>20 03/12/10.16:18</date_time>
<tag_id>tag_id_ from_trans_4</tag_id>
<stop_location_ id>stop_locatio n_id_from_trans _4</stop_location_i d>
<fare_type_cd>f are_type_cd_fro m_trans_4</fare_type_cd>
<blacklist_cd>b lacklist_cd_fro m_trans_4</blacklist_cd>
</record>
<header>
<driver_id>driv er_id_from_tran s</driver_id>
<vehicle_id>veh icle_id_from_tr ans</vehicle_id>
<duty_shift_id> duty_shift_id_f rom_trans</duty_shift_id>
<route_id>route _id_from_trans</route_id>
<cid_terminal_i d>cid_terminal_ id_from_trans</cid_terminal_id >
</header>
<record>
<date_time>20 03/12/10.17:08</date_time>
<tag_id>tag_id_ from_trans_1</tag_id>
<stop_location_ id>stop_locatio n_id_from_trans _1</stop_location_i d>
<fare_type_cd>f are_type_cd_fro m_trans_1</fare_type_cd>
<blacklist_cd>b lacklist_cd_fro m_trans_1</blacklist_cd>
</record>
<record>
<date_time>20 03/12/10.17:18</date_time>
<tag_id>tag_id_ from_trans_4</tag_id>
<stop_location_ id>stop_locatio n_id_from_trans _4</stop_location_i d>
<fare_type_cd>f are_type_cd_fro m_trans_4</fare_type_cd>
<blacklist_cd>b lacklist_cd_fro m_trans_4</blacklist_cd>
</record>
</root>
TIA