There is an important difference in variable value specification. : variable « XSLT stylesheet « XML Tutorial

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XML Tutorial » XSLT stylesheet » variable 
5. 68. 6. There is an important difference in variable value specification.
File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
    <AAA>
      <BBB>
        <CCC>C1</CCC>
      </BBB>
      <CCC>C2</CCC>
      <CCC>C3</CCC>
    </AAA>
    <AAA>
      <CCC>
        <DDD>D1</DDD>
        <DDD>D2</DDD>
      </CCC>
    </AAA>
</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="var1" select="//AAA/CCC/text()"/>
    <xsl:variable name="var2">//AAA/CCC/text()</xsl:variable>
    <xsl:template match="/">
      <xsl:call-template name="function">
        <xsl:with-param name="path1" select="//AAA/CCC/DDD"/>
        <xsl:with-param name="path2">//AAA/CCC/DDD</xsl:with-param>
      </xsl:call-template>
    </xsl:template>
    <xsl:template name="function">
      <xsl:param name="path1"/>
      <xsl:param name="path2"/>
      <paragraph>
        <xsl:value-of select="$path2"/>
        <xsl:text> : </xsl:text>
        <xsl:value-of select="$path1"/>
      </P>
      <paragraph>
        <xsl:value-of select="$var2"/>
        <xsl:text> : </xsl:text>
        <xsl:for-each select="$var1">
          <xsl:value-of select="."/>
          <xsl:text/>
        </xsl:for-each>
      </P>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><paragraph>//AAA/CCC/DDD : D1</P><paragraph>//AAA/CCC/text() : C2C3
        
        
      </P>
5. 68. variable
5. 68. 1. Define variable and use it
5. 68. 2. Fill position to a variable
5. 68. 3. Define and use variable
5. 68. 4. Variable scope
5. 68. 5. Variable assignment with choose statement
5. 68. 6. There is an important difference in variable value specification.
5. 68. 7. if a variable has some defined value
5. 68. 8. Variable without initialization
5. 68. 9. demonstrate different ways of setting xsl:variable
5. 68. 10. Use variable to hold a result tree
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