[xsl] How do I set up a counter or sequence number variable

["Catherine Wilbur cwilbur@xxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Looked on the archive and did not see anything similar to what I am doing. 
 I am trying to put a sequence number for each output line.  Each time I 
output a line I want to increment the counter by one.  Noticed on internet 
once you change a variable in XSLT you cannot change the value.  How do I 
set up a sequence number.  This is how my output is coming out.  Had to 
change order of my output and add few more output fields. so resent my 
question.

1, LIBPROD, 201411031640LUSD, 99999, 18105.8820, PO-305, 20140724, 
20141103, USD, 1.0742, 22, 20,  ,  , ABE/2014082450002181
1, LIBPROD, 201411031640LUSD, 99999, 18105.8430, PO-305, 20140724, 
20141103, USD, 1.0742, 22, 2,  ,  , ABE/2014082450002181

Want the output to come out as follows (first field is my sequence number)

1, LIBPROD, 201411031640LUSD, 99999, 18105.8820, PO-305, 20140724, 
20141103, USD, 1.0742, 22, 20,  ,  , ABE/2014082450002181
2, LIBPROD, 201411031640LUSD, 99999, 18105.8430, PO-305, 20140724, 
20141103, USD, 1.0742, 22, 2,  ,  , ABE/2014082450002181

Here is my XSLT code (copied some code off the web with an interate so put 
template in code - not sure how to use this code for counter or sequencing

<?xml version="1.0" encoding="UTF-8" ?>

<!-- New document created with EditiX at Thu Oct 23 16:28:34 EDT 2014 -->

<xsl:stylesheet version="2.0" 
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
        xmlns:xs="http://www.w3.org/2001/XMLSchema";
        xmlns:fn="http://www.w3.org/2005/xpath-functions";
        xmlns:xdt="http://www.w3.org/2005/xpath-datatypes";
        xmlns:err="http://www.w3.org/2005/xqt-errors";
        exclude-result-prefixes="xs xdt err fn"
        xmlns:date="http://exslt.org/dates-and-times";
        extension-element-prefixes="date">


        <xsl:output method="text" indent="no"/>
 
        <xsl:variable name="GLDateValue" 
select="format-date(current-date(),'[Y0001][M01][D01]')"/>
        <xsl:variable name="CurrDateTimeValue" 
select="format-dateTime(current-dateTime(),'[Y0001][M01][D01][H01][m01]')"/>
 
 
        <!-- OUSTANDING OUTPUT DATA ISSUES -->
        <!-- xsl:value-of select="../../../../../hardcode_RemarkString" 
/>, derived field --> 
        <!-- xsl:value-of select="../../../../../hardcode_PayTerms" />, 
derived from part of invoice/invoice_number --> 
        <!-- xsl:value-of select="../../../../../hardcode_Attachments" />, 
derived from part of invoice/invoice_number --> 
 
         <xsl:template name="iterate">
                 <xsl:param name="length" select="8"/>
                 <xsl:param name="i" select="1"/>
                 <pos><xsl:value-of select="$i"/></pos>
                 <xsl:if test="$length > 1">
                                <xsl:call-template name="iterate">
                                        <xsl:with-param name="length" 
select="$length - 1"/>
                                        <xsl:with-param name="i" 
select="$i + 1"/>
                                </xsl:call-template>
                        </xsl:if>
        </xsl:template>
 
        <xsl:template match="/">
                <xsl:for-each 
select="payment_data/invoice_list/invoice/invoice_line_list/invoice_line/fund_info_list/fund_info/amount">
                        <xsl:variable name="inv" select="../../../../.."/>

                        <xsl:variable name="InvoiceDateValue" 
select="translate($inv/invoice_date,'/','')"/>
                        <xsl:variable name="InvoiceVendorCode" 
select="$inv/vendor_code"/>
                        <xsl:variable name="InvoiceVendorNo" 
select="$inv/vendor_FinancialSys_Code"/>
                        <xsl:variable name="InvoiceCurrency" 
select="$inv/invoice_amount/currency"/>
                        <xsl:variable name="InvoicePOLineOwner" 
select="../../../../invoice_line/po_line_info/po_line_owner"/>
                        <xsl:variable name="InvoiceNumber" 
select="$inv/invoice_number"/>
 
                        <xsl:variable name="FISVendorNo">
                                 <xsl:choose>
                                        <xsl:when 
test="string-length($InvoiceVendorNo)!=0">
                                                <xsl:value-of 
select="number($InvoiceVendorNo)"/>
                                        </xsl:when>
 <xsl:otherwise>99999</xsl:otherwise>
                                </xsl:choose>
                        </xsl:variable> 
 
                        <xsl:variable name="PaymentAttachment">
                                 <xsl:choose>
                                        <xsl:when 
test="contains($InvoiceNumber, '(ATC)') or starts-with($InvoiceNumber, 
'PPD')">
                                                <xsl:value-of 
select="'A'"/>
                                        </xsl:when>
                                        <xsl:otherwise>
                                                <xsl:value-of select="' 
'"/>
                                        </xsl:otherwise>
                                </xsl:choose>
                        </xsl:variable>
 
                        <xsl:variable name="PaymentTerms">
                                 <xsl:choose>
                                        <xsl:when 
test="contains($InvoiceNumber, '(PPD)') or contains($InvoiceNumber, 
'(RSH)') or starts-with($InvoiceNumber, 'CM') or 
contains($InvoiceVendorCode, 'OCL C')">
                                                <xsl:value-of 
select="'U'"/>
                                        </xsl:when>
                                        <xsl:otherwise>
                                                <xsl:value-of select="' 
'"/>
                                        </xsl:otherwise>
                                </xsl:choose>
                        </xsl:variable>
 
                        <xsl:variable name="POOwnerType">
                                 <xsl:choose>
                                        <xsl:when 
test="contains($InvoicePOLineOwner, 'Law') or 
contains($InvoicePOLineOwner, 'LAW') ">
                                                <xsl:value-of 
select="'W'"/>
                                        </xsl:when>
                                        <xsl:otherwise>
                                                <xsl:value-of 
select="'L'"/>
                                        </xsl:otherwise>
                                </xsl:choose>
                        </xsl:variable>
 
                           <xsl:value-of select="count(sum),
                                                   'LIBPROD',
 concat($CurrDateTimeValue,$ POOwnerType,$InvoiceCurrency),
                                                   $FISVendorNo,
 ../external_id, 
                                                   $inv/invoice_number,    
 
 
concat(substring($InvoiceDateValue,5,4),substring($InvoiceDateValue,1,2),substring($InvoiceDateValue,3,2)),
 $GLDateValue,
 $inv/invoice_amount/currency, 
 $inv/invoice_exchange_rate_list/exchange_rate/rate,
                                  $inv/invoice_amount/sum, 
                                  sum,
 $PaymentAttachment,
 $PaymentTerms,  
 concat($inv/vendor_code,'/',$inv/unique_identifier) " separator=", "/> 
                                        <xsl:text>&#xa;</xsl:text> 
                  </xsl:for-each> 

        </xsl:template>
</xsl:stylesheet>

_____________________________________________________________________
Catherine Wilbur  |  Senior Application Programmer  |  IT Services
401 Sunset Avenue, Windsor ON Canada  N9B 3P4
(T) 519.253.3000 Ext. 2745  |  (F) 519.973.7083  |  (E) 
cwilbur@xxxxxxxxxxx
www.uwindsor.ca/its