[xsl] Declaring more than one type for a parameter in xsl:function?

[Georges Schmitz <georges.schmitz@xxxxxxxxx>]

Hi,

I'm working with a xsl:function that should accept to different sequence 
types in the same parameter (e.g. element a or b), or even an element 
node and an atomic value like xs:string.

Pseudo example:

<xsl:function name="myf:funct" as="xs:string">
 <xsl:param name="t" as="element(a) | element(b)"/>
 ...
or

<xsl:function name="myf:funct" as="xs:string">
 <xsl:param name="t" as="element(b) | xs:string"/>
 ...

Only one sequence type is allowed and function overloading with 
different types doesn't work. So does a simple solution exist here?

Thanks in advance,
Georges