If you need to do a find and replace when outputting a column in a data view you can use the following:
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<xsl:template name=”stringreplace”>
  <xsl:param name=”stringvalue” />
  <xsl:param name=”from” />
  <xsl:param name=”to” />
  <xsl:choose>
   <xsl:when test=”contains($stringvalue, $from)”><xsl:value-of select=”substring-before($stringvalue, $from)” />
    <xsl:if test=”contains(substring($stringvalue, 1, string-length($stringvalue) - 1), $from)”><xsl:value-of select=”$to” />
     <xsl:call-template name=”stringreplace”>
      <xsl:with-param name=”stringvalue” select=”substring-after($stringvalue, $from)” />
      <xsl:with-param name=”from” select=”$from” />
      <xsl:with-param name=”to” select=”$to” />
     </xsl:call-template>
    </xsl:if>
   </xsl:when>
   <xsl:otherwise><xsl:value-of select=”$stringvalue” /></xsl:otherwise>
  </xsl:choose>
 </xsl:template>
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Call the template code:
Say you have a column named ColumnName and you want to replace all occurrences of True and set them to False…..

 <xsl:call-template name=”stringreplace”>
 <xsl:with-param name=”stringvalue” select=”@ColumnName” />
 <xsl:with-param name=”from” select=”True” />
 <xsl:with-param name=”to” select=”False” />
 </xsl:call-template>

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