Re: Need an XPath expression for: $B is not contained

Hi Wendell,

> "empty($A intersect $B//*)"

I think that generally using the ancestor-or-self:: axis will be more
efficient than using $B//*, because the depth of an XML document tends
to be fairly limited in size.

So:

     ($B/ancestor-or-self::* intersect $A)[1]

Cheers,
Dimitre

On Thu, Jun 14, 2018 at 1:34 PM, Wendell Piez wapiez@xxxxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> "not(some $b in ($B//*) satisfies ($b is $A))"
>
> (oh Roger came up with that.)
>
> or nicer?
>
> "empty($A intersect $B//*)"
>
> XPath 1.0:
>
> "count($B/**) = count($B//* | $A)"
>
> Cheers, Wendell
>
>
>
> On Thu, Jun 14, 2018 at 8:23 AM, Costello, Roger L. costello@xxxxxxxxx
> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Hi Folks,
> >
> > The variable $A contains an element.
> >
> > The variable $B contains an element.
> >
> > I need an XPath expression that determines if $B is not contained in $A.
> >
> > This XPath expression seems to work:
> >
> >     not(index-of($B/ancestor::*,$A))
> >
> > but that seems awful, i.e., not straightforward, convoluted, and probably inefficient.
> >
> > Is there a better (simpler, straightforward, efficient) XPath expression?
> >
> > /Roger
> >
>
>
>
> --
> Wendell Piez | http://www.wendellpiez.com
> XML | XSLT | electronic publishing
> Eat Your Vegetables
> _____oo_________o_o___ooooo____ooooooo_^
> 




-- 
Cheers,
Dimitre Novatchev
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