XML Tutorial/XSLT stylesheet/boolean operator

not operator in if statement

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

Or, not operator and if statement

File: Data.xml
<?xml version="1.0"?>
<addressbook>
  <address>
    <name>
      <title>Ms.</title>
      <first-name>Bond</first-name>
      <last-name>Lee</last-name>
    </name>
    <street>707 Main Way</street>
    <city>New York</city>
    <state>ME</state>
    <zip>00218</zip>
  </address>
</addressbook>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" indent="no"/>
  <xsl:variable name="newline">
  <xsl:text></xsl:text>
  </xsl:variable>
  <xsl:template match="/">
    <xsl:text>Addresses sorted by zip code</xsl:text>
    <xsl:value-of select="$newline"/>
    <xsl:for-each select="addressbook/address">
      <xsl:sort select="zip"/>
      <xsl:if test="not(preceding-sibling::address) or zip!=preceding-sibling::address[1]/zip">
        <xsl:value-of select="$newline"/>
        <xsl:text>Zip code </xsl:text>
        <xsl:value-of select="zip"/>
        <xsl:text> (</xsl:text>
        <xsl:value-of select="city"/>
        <xsl:text>, </xsl:text>
        <xsl:value-of select="state"/>
        <xsl:text>): </xsl:text>
        <xsl:value-of select="$newline"/>
      </xsl:if>
      <xsl:if test="name/title">
        <xsl:value-of select="name/title"/>
        <xsl:text> </xsl:text>
      </xsl:if>
      <xsl:value-of select="name/first-name"/>
      <xsl:text> </xsl:text>
      <xsl:value-of select="name/last-name"/>
      <xsl:value-of select="$newline"/>
      <xsl:value-of select="street"/>
      <xsl:value-of select="$newline"/>
      <xsl:value-of select="$newline"/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Output:
Addresses sorted by zip codeZip code 00218 (New York, ME): Ms. Bond Lee707 Main Way

select="emailList/person[not(position()=1)]"

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<emailList>
  <head:header xmlns:head="http://www.domain.ru/namespace/header">
    <title>Email List</title>
    <maintainer>Joe</maintainer>
  </head:header>
  <person type="personal" id="p001">
    <name>person1</name>
    <email>p@hotmail.ru</email>
  </person>
  <person type="work" id="p002">
    <name>person2</name>
    <email>p@hotmail.ru</email>
  </person>
  <person type="personal" id="p003">
    <name>person3</name>
    <email>p3@hotmail.ru</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="text" indent="yes" />
  <xsl:template match="/">
    <xsl:apply-templates
      select="emailList/person[not(position()=1)]" />
  </xsl:template>
  <xsl:template match="person">
    <xsl:apply-templates />
  </xsl:template>
</xsl:stylesheet>
Output:

    person2
    p@hotmail.ru
  
    person3
    p3@hotmail.ru