Thanks Martin. Nearly there


> >    <xsl:param name="types" as="xs:string"/>
>
> If you declare the type as a single string item, then it doesn't make
> sense to attempt to use the "?param-name" syntax further below to pass
> in an XPath expression evaluating to a sequence of strings.
>
>

>
>    as="xs:string"
>
> and
>
>    types=A,B
>
> and
>
>    test="type = tokenize($types, ',')"

Produces an earlier message (a weak one from Saxon!)
 No line number, just 'The context item is absent'

Closer...


-- 
Dave Pawson
XSLT XSL-FO FAQ.
Docbook FAQ.