[xsl] Which is faster: count(/Document/A/B) eq 1 ... or ... /Document/A/

Hi Folks,

Consider this XML document:

<Document>
    <A>
        <B>blah</B>
    </A>
</Document>

Here are two XPath expressions to test that there is exactly one <B> element in 
the <A> element (assume there is only one <A> element):

1. count(/Document/A/B) eq 1

2. /Document/A/(count(B) eq 1)

Which is faster?

Is there an XPath expression, besides the ones listed, that is even better and 
faster?

/Roger

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