On 19 July 2016 at 13:05, Costello, Roger L. costello(_at_)mitre(_dot_)org
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
Hi Folks,
I need an XPath expression which returns a Boolean value:
If there is an A then return true only if there is a B.
If there is no A then return true.
For example, the XPath expression should return true for this:
<Document>
<A/>
<B/>
</Document>
The XPath should return false for this:
<Document>
<A/>
</Document>
Which XPath expression is best (most efficient)?
(a) if (A) then exists(B) else true()
(b) (A and B) or (not(A))
(c) something else (what?)
not(A) or B
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