Exit a loop from custom xslt

Question

My custom xslt is as follows which I am using in my map:
<?xml version="1.0" encoding="utf-16"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:var="http://schemas.microsoft.com/BizTalk/2003/var"
                exclude-result-prefixes="msxsl var s0 userCSharp" version="1.0" xmlns:s0="http://Students.Student.SourceSchema"
                xmlns:ns0="http://Students.Student.DestinationSchema"
                xmlns:userCSharp="http://schemas.microsoft.com/BizTalk/2003/userCSharp">
  <xsl:output omit-xml-declaration="yes" method="xml" version="1.0" />
  <xsl:template match="/">
    <xsl:apply-templates select="/s0:Students" />
  </xsl:template>
  <xsl:template match="/s0:Students">
    <ns0:DestinationDetails>
      <xsl:for-each select="StudentTransactions">
        <xsl:if test="FName='H'">
          <xsl:variable name="var:v104" select="ID"/>
          <xsl:for-each select="/s0:Students/StudentTransactions[FName='D' and ID_Detail=$var:v104]">
            <xsl:variable name="Detail_String" select="string(GL_String/text())"/>
            <xsl:if test="$Detail_String!=''">
              <Details>
                <HeaderSegment>
                </HeaderSegment>
              </Details>
              </xsl:if>
          </xsl:for-each>
        </xsl:if>
      </xsl:for-each>
    </ns0:DestinationDetails>
  </xsl:template>
  <msxsl:script language="C#" implements-prefix="userCSharp">
    <![CDATA[
public string StringConcat(string param0)
   return param0;
]]>
  </msxsl:script>
</xsl:stylesheet>
I want to break the following loop : 
<xsl:for-each select="/s0:Students/StudentTransactions[FName='D' and ID_Detail=$var:v104]">
when  <xsl:if test="$Detail_String!=''"> condition is true.
Any kind of  help would be appreciated.
Prakash

Answer 1

Got your point. The counter is not incrementing because, varialbes are immutable in XSLT, i.e. they can't be changed. I think what you need to do is use the position(). With the
resultset of For-each, using position()=1 in <xsl:if test="position() =1 , you would just access the first record of the resultset
from for-each
If my understanding of your problem is correct, then the following XSLT shall work for you.
<?xml version="1.0" encoding="utf-16"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:var="http://schemas.microsoft.com/BizTalk/2003/var" exclude-result-prefixes="msxsl var s0 userCSharp" version="1.0" xmlns:s0="http://CallTemplate_Increment.StudentSchema" xmlns:ns0="http://CallTemplate_Increment.DestinationStudentSchema" xmlns:userCSharp="http://schemas.microsoft.com/BizTalk/2003/userCSharp">
<xsl:output omit-xml-declaration="yes" method="xml" version="1.0" />
<xsl:template match="/">
<xsl:apply-templates select="/s0:Students" />
</xsl:template>
<xsl:template match="/s0:Students">
<ns0:DestinationDetails>
<xsl:for-each select="StudentTransactions">
<xsl:if test="FName='H'">
<xsl:variable name="var:v104" select="ID"/>
<xsl:variable name="count" select="0"/>
<xsl:for-each select="/s0:Students/StudentTransactions[FName='D' and ID_Detail=$var:v104]">
<xsl:variable name="Detail_String" select="string(GL_String/text())"/>
<!--<xsl:if test="$Detail_String!='' and $count=0">-->
<xsl:if test="position() =1 and $Detail_String!=''" >
<xsl:variable name="var:v1" select="userCSharp:StringConcat(string(FName/text()) , string(LName/text()))" />
<Details>
<ID>
<xsl:value-of select="ID/text()" />
</ID>
<FullName>
<xsl:value-of select="$var:v1" />
</FullName>
<Cost>
<xsl:value-of select="Cost/text()" />
</Cost>
</Details>
<!--<xsl:value-of select="$count + 1"/>-->
</xsl:if>
</xsl:for-each>
</xsl:if>
</xsl:for-each>
</ns0:DestinationDetails>
</xsl:template>
<msxsl:script language="C#" implements-prefix="userCSharp">
<![CDATA[
public string StringConcat(string param0, string param1)
return param0 + param1;
]]>
</msxsl:script>
</xsl:stylesheet>
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