not Function
Returns true if the argument is false; otherwise false.
boolean not(boolean)
Example
In this example, the notexample.xsl stylesheet is applied to the books.xml document. For each book node, the value of the <price> element is evaluated. If it's not greater than 10, the value of the <title> element and the value of the <price> element are output to the browser.
XML File (books.xml)
<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="notexample.xsl"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications with
XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen of the world.</description>
</book>
</catalog>
XSLT File (notexample.xsl)
<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:for-each select="//book[not(price > 10)]">
<xsl:value-of select="title"/> -
$<xsl:value-of select="price"/><br/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Formatted Output
Midnight Rain - $5.95
Processor Output
<?xml version="1.0" encoding="UTF-16"?>Midnight Rain - $5.95<br />