remove text from a node in input XML - xslt

Question

i am trying to copy entire input xml in a string for further processing and also i have a requirement to remove text from a particular node (plancode) before copying in the variable. May I know how can i achieve this using xslt
INPUT XML:
<CallMember>
<PlanD>
<abcpr>you</abcpr>
<Desd>Protection</Desd>
<plancode>76789</plancode>
<plaDesc>goody</plaDesc>
</PlanD>
<fType>ONLINE</fType>
</CallMember>
XSLT i am trying :
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xalan="http://xml.apache.org/xslt" xmlns:func="http://exslt.org/functions" xmlns:dp="http://www.datapower.com/extensions" xmlns:regexp="http://exslt.org/regular-expressions" xmlns:tglfn="http://test.com/tgl" xmlns:date="http://exslt.org/dates-and-times" exclude-result-prefixes="#all" extension-element-prefixes="dp regexp">
<xsl:output method="xml" encoding="UTF-8" indent="yes" omit-xml-declaration="no"/>
<xsl:template match="/">
<xsl:variable name="InputRequest">
<xsl:copy-of select="."/>
</xsl:variable>
<xsl:variable name="modifiedRequest">
<xsl:copy-of select="."/>
<plancode></plancode>
</xsl:variable>
</xsl:template>
OUTput i am expecting in the modifiedRequest variable:
<CallMember>
<PlanD>
<abcpr>you</abcpr>
<Desd>Protection</Desd>
<plancode></plancode> <!-- this value needs to get emptied -->
<plaDesc>goody</plaDesc>
</PlanD>
<fType>ONLINE</fType>
</CallMember>

Answer 1

Use an identity template in combination with an (nearly) empty template for filtering and apply-templates to it:
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xalan="http://xml.apache.org/xslt"
xmlns:func="http://exslt.org/functions"
xmlns:dp="http://www.datapower.com/extensions"
xmlns:regexp="http://exslt.org/regular-expressions"
xmlns:tglfn="http://test.com/tgl"
xmlns:date="http://exslt.org/dates-and-times"
exclude-result-prefixes="#all" extension-element-prefixes="dp regexp">
<xsl:output method="xml" encoding="UTF-8" indent="yes" omit-xml-declaration="no"/>
<!-- identity template -->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*" />
</xsl:copy>
</xsl:template>
<xsl:template match="/">
<xsl:variable name="InputRequest">
<xsl:copy-of select="."/>
</xsl:variable>
<!-- copies subtree except matching empty template -->
<xsl:variable name="modifiedRequest">
<xsl:copy>
<xsl:apply-templates select="node()|#*" />
</xsl:copy>
</xsl:variable>
</xsl:template>
<!-- (nearly) empty template copies only element without content -->
<xsl:template match="plancode">
<xsl:copy />
</xsl:template>
</xsl:stylesheet>