Subject: [xsl] Need your recommendation please for an XPath expression From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 19 Jul 2016 12:05:33 -0000 |
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?) /Roger
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