Incorrect Intersect and Except Output?

[Michael Kay]

> Michael Kay wrote:
> 
> > let $a1 := <a/>, $a2 := <a/> return count(($a1, $a2))

That appears to be what my fingers typed, but my brain was certainly saying
"|"!

Michael Kay

> 
>   I guess you meant:
> 
>     let $a1 := <a/>, $a2 := <a/> return count(($a1|$a2))
>