Here is an XPath 2.0 expression to answer that question (thanks to Dimitre):
empty(Websites/*[index-of(../*,.)[2]])
Here is an XPath 1.0 expression to answer that question:
not(//Websites/*[. = preceding-sibling::*])
Are there any situations where those two XPath expressions differ in their
answer?
I think that two expressions are "equivalent" if their evaluation
produces the same result on any XML document.
These *would be* equivalent, especially if "//" is removed from the
second expression.
As we know well, these are generally different:
Websites
and
//Websites
Cheers,
Dimitre
On Thu, Nov 1, 2012 at 6:01 AM, Costello, Roger L.
<costello(_at_)mitre(_dot_)org> wrote:
Hi Folks,
Are there no duplicate websites in this list:
<Websites>
<Website id="Amazon"> http://www.amazon.com </Website>
<Website id="Apple"> http://www.apple.com </Website>
<Website id="Ebay"> http://www.ebay.com </Website>
<Website id="Google"> http://www.google.com </Website>
<Website id="Microsoft"> http://www.microsoft.com </Website>
<Website id="VirginAtlantic"> http://www.virgin-atlantic.com
</Website>
</Websites>
Here is an XPath 2.0 expression to answer that question (thanks to Dimitre):
empty(Websites/*[index-of(../*,.)[2]])
Here is an XPath 1.0 expression to answer that question:
not(//Websites/*[. = preceding-sibling::*])
Are there any situations where those two XPath expressions differ in their
answer?
/Roger
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Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
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To avoid situations in which you might make mistakes may be the
biggest mistake of all
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