conversion of boolean values true and false : number function « XSLT stylesheet « XML Tutorial

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2. XSLT stylesheet
3. number function

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
    <text>124</text>
    <text>1 2 4</text>
    <text>-16</text>
    <text>- 16</text>
    <text>125.258</text>
    <text>125.</text>
    <text>ASDF</text>
    <text>A123</text>
    <text>true</text>
    <text>false()</text>
</data>
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:template match="/">
      <TABLE border="1">
        <TR>
          <td>text</TH>
          <td>number</TH>
        </TR>
        <xsl:for-each select="//text[text() = 'true' or text() = 'false()']">
          <TR>
            <TD>
              <xsl:value-of select="."/>
            </TD>
            <TD>
              <xsl:value-of select="number()"/>
            </TD>
          </TR>
        </xsl:for-each>
      </TABLE>
      <Paragraph>
        <xsl:text>but:</xsl:text>
      </Paragraph>
      <TABLE border="1">
        <TR>
          <td>function</TH>
          <td>number</TH>
        </TR>
        <TR>
          <TD>true()</TD>
          <TD>
            <xsl:value-of select="number(true())"/>
          </TD>
        </TR>
        <TR>
          <TD>false()</TD>
          <TD>
            <xsl:value-of select="number(false())"/>
          </TD>
        </TR>
        <TR>
          <TD>5>7</TD>
          <TD>
            <xsl:value-of select="number(5 > 7)"/>
          </TD>
        </TR>
        <TR>
          <TD>5&lt;7</TD>
          <TD>
            <xsl:value-of select="number(5&lt;7)"/>
          </TD>
        </TR>
      </TABLE>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><TABLE border="1"><TR><td>text</TH><td>number</TH></TR><TR><TD>true</TD><TD>NaN</TD></TR><TR><TD>false()</TD><TD>NaN</TD></TR></TABLE><Paragraph>but:</Paragraph><TABLE border="1"><TR><td>function</TH><td>number</TH></TR><TR><TD>true()</TD><TD>1</TD></TR><TR><TD>false()</TD><TD>0</TD></TR><TR><TD>5&gt;7</TD><TD>0</TD></TR><TR><TD>5&lt;7</TD><TD>1</TD></TR></TABLE>