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Use boolean operator in if statement


File: Data.xml

<?xml version="1.0"?>
<booklist>
  <book category="S">
    <title>title 1</title>
    <author>author 1</author>
  </book>
  <book category="FC">
    <title>author 1</title>
    <author>author 1</author>
  </book>
  <book category="FC">
    <title>title 3</title>
    <author>author 1</author>
  </book>
  <book category="CS">
    <title>title 4</title>
    <author>author 1</author>
    <author>author 2</author>
    <author>author 3</author>
    <author>author 4</author>
  </book>
</booklist>

File: Transform.xslt

<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="2.0">
  <xsl:template match="/">
    <html>
      <body>
        <xsl:variable name="all-books" select="//book" />
        <xsl:for-each select="$all-books">
          <h1>
            <xsl:value-of select="title" />
          </h1>
          <p>
            <i>by</i>
            <xsl:value-of select="author[1]" />
            <xsl:if test="count(author)!=1">
              and others
            </xsl:if>
          </p>
          <xsl:variable name="others" select="$all-books[./@category=current()/@category and not(. is current())]" />
          <xsl:if test="$others">
            <p>Other books in this category:</p>
            <ul>
              <xsl:for-each select="$others">
                <li>
                  <xsl:value-of select="title" />
                </li>
              </xsl:for-each>
            </ul>
          </xsl:if>
        </xsl:for-each>
      </body>
    </html>
  </xsl:template>

</xsl:transform>

Output:
<html>
   <body>
      <h1>title 1</h1>
      <p><i>by</i>author 1
      </p>
      <h1>author 1</h1>
      <p><i>by</i>author 1
      </p>
      <p>Other books in this category:</p>
      <ul>
         <li>title 3</li>
      </ul>
      <h1>title 3</h1>
      <p><i>by</i>author 1
      </p>
      <p>Other books in this category:</p>
      <ul>
         <li>author 1</li>
      </ul>
      <h1>title 4</h1>
      <p><i>by</i>author 1
                       and others
                     
      </p>
   </body>
</html>

 








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