[xsl] xsl extension functions with Java Vectors and Xalan

I have written some extension functions for an xsl style sheet

These are writtin in Java

One function takes a NodeList from the style sheet and does a bit of messing 
around with databases and external tools and returns a Vector of objects of a 
class that is defined inside the interface class.

The Methods are static methods on the class and the class is defined as a 
namespace

Another template is used to interrogate each object in the vector and build up 
the output accordinglu. It does this via a 

<xsl:for-each select="mynamespace:my-function( node ) >
        <xsl:call-template name="xxxxxxxxxx"> 
                <xsl:with-param name="abc" select="."/>
        </xsl
</xsl

<xsl:template name="xxxxxxxxxx">
        <xsl:param name="abc"/> 
        <xsl:element name="Item" use-attribute-sets="Detail">
                <xsl:attribute name="yyy">
                        <xsl:value-of 
select="mynamespace:my-second-function($abc)"/>
                </xsl:attribute>


my-function takes a NodeSet and returns a Vector of items
my-second-funcction takes an item and returns a String

This all worked straight away using Saxon 8 xslt version 2.

You'd think that was enough but some people here think Xalan is a better 
standard, and for the life of me I cant get it to work with Xalan.

The interface with strings and NodeSet all works fine and I can return the 
Vector into a variable but I have totally failed to process the elements of the 
vector.

The error message I get is

"SystemId Unknown; Line #0; Column #0; Can not convert #UNKNOWN 
(java.util.Vector) to a NodeList!"

All suggestions (yes all) gratefully received

M

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