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Operators "=" and "!=" are not inverts of each other

The previous pages demonstrated that operators "=" and "!=" are not inverts of each other. It means that it is possible to find expressions where substitution of one operator for the other one does not change the returned value.

XSLT

      <xsl:stylesheet
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  version="2.0">
            <xsl:output  method="xml"
                        indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template  match="/aaa">
                  <xxx>
                        <xsl:value-of  select="if ((1,2) = (1,2)) then 1 else 0"/>
                  </xxx>
                  <yyy>
                        <xsl:value-of  select="if ((1,2) != (1,2)) then 1 else 0"/>
                  </yyy>
                  <zzz>
                        <xsl:value-of  select="if (3 = (1,2,3)) then 1 else 0"/>
                  </zzz>
                  <ooo>
                        <xsl:value-of  select="if (3 != (1,2,3)) then 1 else 0"/>
                  </ooo>
            </xsl:template>

      </xsl:stylesheet>
XML

      <aaa/>
Output

      <xxx>1</xxx>
      <yyy>1</yyy>
      <zzz>1</zzz>
      <ooo>1</ooo>


Previous chapter: Stylesheet Functions
Next chapter: Conditional Expressions
Previous page: Operator != and sequences
Next page: Finding out identical nodes - is operator

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