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XPath expression to check that there are no intervenin

Subject: XPath expression to check that there are no intervening elements?
From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 19 Jul 2016 15:44:16 -0000
 XPath expression to check that there are no intervenin
Hi Folks,

This XML has a solid block of <B> elements:


This XML has an intervening <C> element:


I need an XPath expression to return a Boolean value:

	Return true if there is one solid block of <B> elements
              	(no intervening elements).
 	Otherwise, return false.

I created a horrendous XPath expression to solve it:

count(B) eq (B[last()]/count(preceding-sibling::*)+1 -

Can you provide a better (simpler, more efficient) XPath expression?


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