Re: [xsl] Need an XPath expression for: $B is not contained in $A

["Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> "empty($A intersect $B//*)"
>
> XPath 1.0:
>
> "count($B/**) = count($B//* | $A)"
>
> Cheers, Wendell
>

Getting all the ancestors of $A is likely to be a lot faster than getting all
the descendants of $B, simply because a node typically has many descendants
but few ancestors.

Michael Kay
Saxonica