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not()

XSLT/XPath Reference: XSLT elements, EXSLT functions, XPath functions, XPath axes

The not function evaluates a boolean expression and returns the opposite value.

Syntax

not(expression )

Arguments

expression
The expression is evaluated exactly as if it were passed as an argument to the boolean() function.

Returns

True for an expression that evaluates to false; false for an expression that evaluates to true.

Notes

  • This function should behave similarly to the boolean() function except that it returns the opposite value.
  • You can test if an element doesn't have some attribute.
<xsl:for-each match="//a[not(@name and @name = 'badname')]">
  <!-- iterates over any <a> element in the document, that
       either has no 'name' attribute at all, or it has one,
       but its value is not "badname". -->
</xsl:template>

Defined

XPath 1.0 4.3

Gecko support

Supported.

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/XPath/Functions/not