not operator in if statement : boolean operator « XSLT stylesheet « XML Tutorial

1. XML Tutorial
2. XSLT stylesheet
3. boolean operator

File: Data.xml

<?xml version="1.0" encoding="utf-8"?>
<emailList>
  <head:header xmlns:head="http://www.domain.com/namespace/header">
    <title>Email List</title>
    <maintainer>Joe</maintainer>
  </head:header>
  <person type="personal" id="p001">
    <name>person1</name>
    <email>p@hotmail.com</email>
  </person>
  <person type="work" id="p002">
    <name>person2</name>
    <email>p@hotmail.com</email>
  </person>
  <person type="personal" id="p003">
    <name>person3</name>
    <email>p3@hotmail.com</email>
  </person>
</emailList>

File: Transform.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="html" indent="yes" />

   <xsl:template match="/">
      <paragraph>Your email list consists of the following individuals:
      <xsl:for-each select="emailList/person">
         <xsl:if test="position()!=last()">
         <xsl:apply-templates select="name" />, </xsl:if>
         <xsl:if test="position()=last()">
         <xsl:apply-templates select="name" />.</xsl:if>
         
      </xsl:for-each>
      </p>
   </xsl:template>

   <xsl:template match="name">
      <xsl:value-of select="normalize-space()" />
   </xsl:template>
</xsl:stylesheet>

Output:

<paragraph>Your email list consists of the following individuals:
   person1, person2, person3.
</p>