[xsl] First steps with high order functions

Hello,

I'm trying to learn high order functions, and I have some difficulties. 
If someone could help...

I have a normal function :

  <xsl:function name="nu:camelCase" as="xs:string?">
    <xsl:param name="s" as="xs:string?"/>
    ...
  </xsl:function>


I want to apply it on each word of a sentence :

  <xsl:function name="nu:clearUsername" as="xs:string?">
    <xsl:param name="name" as="xs:string?"/>
    <xsl:choose>
      <xsl:when test="empty($name)"><xsl:sequence select="()"/></xsl:when>
      <xsl:when test="contains($name, ' ')">
        <xsl:variable name="temp" select="tokenize($name, ' ')"/>
        <xsl:sequence select="string-join(for-each($temp, 
nu:camelCase#1), ' ')"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:sequence select="$name"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:function>

Does the for-each is correct ? Is there another syntax to make this work 
with Saxon-HE ?
Is there a better way to do this ?

Thanks in advance,
Christophe
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