[xsl] Help with staregies for outputting an incremental number in xslt

Hello


Firstly, I am an inexperienced xslt user, so please forgive me if this a 
no-brainer.

My problem is this:
I have a list of nodes, and I need to output a node count with each node.
I use the position() function to output the node count. So far so good.

Recently however, the requirement has changed: under certain circumstances a node is ommited from 
the output.  When a node is ommitted, the node count of the subsequent node is incorrect - because 
the position() function counts all nodes, including the omitted ones.

e.g.:

<xsl:for-each 
select="expensys:Lines/expensys:Line/expensys:Accruals/expensys:Accrual">

  <xsl:variable name="description">
    <xsl:value-of select="../../expensys:ItemDescription"/>
  </xsl:variable>

  <!-- Node ommission
       Set includeLine=false for personal spend lines with CorpCardRec personal 
settlement
       as we dont want to output these -->
   <xsl:variable name="includeLine">
     <xsl:choose>
       <xsl:when test="$description = 'Personal Spend'">
         <xsl:if test="$transactionType = 'CorporateCardReconciliation'">				           <xsl:if 
test="$corporateCardSettlementType = 'corporate'">					             <xsl:value-of 
select="true()"/>								           </xsl:if>											           <xsl:if 
test="$corporateCardSettlementType = 'personal'">					             <xsl:value-of 
select="false()"/>								           </xsl:if>
         </xsl:if>
         <xsl:if test="$transactionType != 'CorporateCardReconciliation'">				 
<xsl:value-of select="true()"/>
         </xsl:if>
       </xsl:when>
       <xsl:otherwise>                                                                          
                   <xsl:value-of select="true()"/>
       </xsl:otherwise>
     </xsl:choose>
   </xsl:variable>

   <xsl:if test="$includeLine='true'">
     <txn:Line>                                                                 
                  
       <txn:Number>                                                                             
                   <xsl:value-of select="position()"/>
       <txn:Number>

       <!-- More data from node is output here..... --!>

     </txn:Line>                                                                
                  
   </xsl:if>



I need the value of txn:Number to increment contigously, but this recent node ommission has thrown a 
spanner in the works :-(
I have searched through the forums and discovered its not possible to increment a variable in a 
for-each loop.  Can anyone guide me to a solution?.


Many thanks in advance....

Adam

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