[xsl] function overloads

Hi

I've defined a function than created an overload:

<xsl:function name="f:action-form" as="element()">
        <xsl:param name="id" as="xs:string" />
        <xsl:param name="actionName" as="xs:string" />
        <xsl:param name="controllerName" as="xs:string" />
        <xsl:param name="method" as="xs:string"/>
        <xsl:param name="routeValues" as="node()" />
        <xsl:apply-templates select="html:action-form($Html, $id, if 
(string-length($method) &gt; 0) then $method else 'post', $actionName, 
$controllerName, f:list($routeValues))" mode="helper"/>
</xsl:function>

<xsl:function name="f:action-form" as="element()">
        <xsl:param name="id" as="xs:string" />
        <xsl:param name="actionName" as="xs:string" />
        <xsl:param name="controllerName" as="xs:string" />
        <xsl:param name="method" as="xs:string" />
        <xsl:apply-templates select="html:action-form($Html, $id, if 
(string-length($method) &gt; 0) then $method else 'post', $actionName, 
$controllerName)" mode="helper"/>
</xsl:function>

When I run the transform, I get the following static error:

{"Required item type of 5th argument of html:action-form() is element(); 
supplied value has item type xs:string"}

I don't understand this; the functions are not executed anywhere. Am I missing 
something?

Thanks

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