[xsl] Which XPath evaluates faster: count(../A) eq 1 or not( following-

Hi Folks,

I am positioned in the XML tree at the first <A> element, within a <parent> 
element.

Requirement: There must be only one <A> element within <parent>.

Here are two XPath expressions to check that there is only one <A> element:

        count(../A) eq 1

or

        not(following-sibling::A)

Which XPath expression evaluates faster?

/Roger
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[xsl] Which XPath evaluates faster: count(../A) eq 1 or not( following-sibling::A)