> I'm having trouble comparing two variables to find out which values are
> present in one but not the other. My attempts to do this return the
> error message:
>
> "A sequence of more than one item is not allowed as the first argument
> of fn:tokenize()"
>
> Here's how I'm creating the variables I'm trying to compare:
>
> <xsl:variable name="jpg_all_names"
> select="tokenize(distinct-values(($jpg_list_1, $jpg_list_2,
> $jpg_list_3)), '\s+')"/>

I suspect you want to tokenize each of the values, combine the results, and
then de-duplicate. That would be

> distinct-values(($jpg_list_1, $jpg_list_2, $jpg_list_3) ! tokenize())

Alternatively you could concatenate the strings (with space separation) and
then tokenize the result:

> distinct-values(tokenize(string-join(($jpg_list_1, $jpg_list_2,
$jpg_list_3), ' '), '\s+'))

Michael Kay
Saxonica