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String() transforms its argument into string

File: Data.xml <?xml version="1.0" encoding="utf-8"?> <data>     <number>9</number>     <number>0</number>     <number>-9</number>     <number/> </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:variable name="A" select="number(//number[1])"/>     <xsl:variable name="B" select="number(//number[2])"/>     <xsl:variable name="C" select="number(//number[3])"/>     <xsl:variable name="D" select="number(//number[4])"/>     <xsl:template match="/">       <Paragraph>         <xsl:value-of select="string(number($A))"/>       </Paragraph>       <Paragraph>         <xsl:value-of select="string(number($D))"/>       </Paragraph>       <Paragraph>         <xsl:value-of select="$A"/>         <xsl:text>/</xsl:text>         <xsl:value-of select="$B"/>         <xsl:text> = </xsl:text>         <xsl:value-of select="string($A div $B)"/>       </Paragraph>       <Paragraph>         <xsl:value-of select="$C"/>         <xsl:text>/</xsl:text>         <xsl:value-of select="$B"/>         <xsl:text> = </xsl:text>         <xsl:value-of select="string($C div $B)"/>       </Paragraph>       <Paragraph>         <xsl:value-of select="$B"/>         <xsl:text>/</xsl:text>         <xsl:value-of select="$B"/>         <xsl:text> = </xsl:text>         <xsl:value-of select="$B div $B"/>       </Paragraph>     </xsl:template> </xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?><Paragraph>9</Paragraph><Paragraph>NaN</Paragraph><Paragraph>9/0 = INF</Paragraph><Paragraph>-9/0 = -INF</Paragraph><Paragraph>0/0 = NaN</Paragraph>