Martin Honnen wrote:

> If you have (element) nodes I fail to see how the index-of function helps

Eek! You are right.

> Don't you need index-of-node?

That is an XPath 3.0 function. I need to stick with XPath 2.0. Suggestions?

/Roger

-----Original Message-----
From: Martin Honnen martin.honnen@xxxxxx
[mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, June 14, 2018 8:52 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Need an XPath expression for: $B is not contained in $A

On 14.06.2018 14:22, Costello, Roger L. costello@xxxxxxxxx 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.

If you have (element) nodes I fail to see how the index-of function helps that
works on sequences and uses "eq" comparison helps to check containment? Don't
you need https://www.w3.org/TR/xpath-functions/#index-of-node?