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Getting length of a string with string-length() function

The function string-length() returns number of characters in the string. The argument of the function must be castable to the string type.

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="string-length('Brr')"/>
                  </xxx>
                  <yyy>
                        <xsl:value-of  select="string-length(bbb)"/>
                  </yyy>
                  <zzz>
                        <xsl:value-of  select="string-length(ccc)"/>
                  </zzz>
            </xsl:template>

      </xsl:stylesheet>
XML

      <aaa>
            <bbb>12345</bbb>
            <ccc/>
      </aaa>
Output

      <xxx>3</xxx>
      <yyy>5</yyy>
      <zzz>0</zzz>


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