[xsl] xPath function in xslt 3.0

Hello

The function below is working well in xQuery 3.0 but not in xslt 3.0 (Saxon-EE 
9.8.0.12 in Oxygen) where it returns NaN. I cannot see the problem? 
Any suggestion?

Thanks in advance
Leo


  <xsl:variable name="exchangeRate" select="function ($fromCurrency as 
xs:string, $toCurrency as xs:string) as xs:double{
    if ($fromCurrency = $toCurrency) then 1.0 else
    number(doc(concat('http://www.floatrates.com/daily/',$fromCurrency,'.xml 
<http://www.floatrates.com/daily/',$fromCurrency,'.xml>'))
    //item[baseCurrency=$fromCurrency and 
targetCurrency=$toCurrency]/exchangeRate)
    }"/>
  
  <xsl:template match="preis">
    <xsl:value-of select="$exchangeRate('USD','CHF’) * ."/>
  </xsl:template>




Whereas in xQuery the same function works as it is expected
declare variable $exchangeRate := function ($fromCurrency as xs:string, 
$toCurrency as xs:string) as xs:double{
        if ($fromCurrency = $toCurrency) then 1.0 else
        number(doc(concat('http://www.floatrates.com/daily/ 
<http://www.floatrates.com/daily/>',$fromCurrency,'.xml'))
        //item[baseCurrency=$fromCurrency and 
targetCurrency=$toCurrency]/exchangeRate)
};
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