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

On 14.06.2018 14:22, Costello, Roger L. costello(_at_)mitre(_dot_)org 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?
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