~/devel/Perl/XML$ cat books.xml 
<library>
  <books>
    <book>
      <name>Programming Perl</name>
      <has_camel_on_cover>true</has_camel_on_cover>
    </book>
    <book>
      <name>Am Ende war die Tat</name>
      <has_camel_on_cover>false</has_camel_on_cover>
    </book>
  </books>
</library>


~/devel/Perl/XML$ cat books.xslt 
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" encoding="utf-8" indent="yes"/>
  <xsl:template match="//books">
  <NewRootElement>
      <xsl:for-each select="book">
        <StringMatching>
          <xsl:choose>
            <xsl:when test="has_camel_on_cover = 'true'">
              <xsl:text>🐪:</xsl:text>
            </xsl:when>
            <xsl:when test="has_camel_on_cover = 'false'">
              <xsl:text>no 🐪:</xsl:text>
            </xsl:when>
            <xsl:otherwise>
              <xsl:text>otherwise:</xsl:text>
            </xsl:otherwise>
          </xsl:choose>
          <xsl:value-of select="name" />
        </StringMatching>
        <BoolEvaluation>
          <xsl:choose>
            <xsl:when test="has_camel_on_cover">
              <xsl:text>🐪:</xsl:text>
            </xsl:when>
            <xsl:otherwise>
              <xsl:text>no 🐪:</xsl:text>
            </xsl:otherwise>
          </xsl:choose>
          <xsl:value-of select="name" />
        </BoolEvaluation>
      </xsl:for-each>
    </NewRootElement>
  </xsl:template>
</xsl:stylesheet>


~/devel/Perl/XML$ xsltproc books.xslt books.xml 
<?xml version="1.0" encoding="utf-8"?>

  <NewRootElement>
  <StringMatching>🐪:Programming Perl</StringMatching>
  <BoolEvaluation>🐪:Programming Perl</BoolEvaluation>
  <StringMatching>no 🐪:Am Ende war die Tat</StringMatching>
  <BoolEvaluation>🐪:Am Ende war die Tat</BoolEvaluation>
</NewRootElement>

bernhard@bernhard-Aspire-A515-57:~/devel/Perl/XML$