How to detect missing xml node before using countNodes?

Below is my xml sample. Right now I use countNodes to count # of <Book> returned.
<ListOfBook>
<Book>A</Book>
<Book>B</Book>
<Book>C</Book>
</ListOfBook>
When there's no data, I got
</ListOfBook>
My countNodes() failed and generated errors. How do I avoid this? Can I detect if <Book> exists first before doing countNodes() and if so how?
I'm using SOA 11.1.1.2
Thanks

Actualy the simplest way to be certain your <ListOfBook> is empty is to check the first element:
If $ListOfBook/Book[1] != ''
If there aqre no Books - nothing happens.
About count nodes - it works. Pb=robably you have a mistake in countNodes definition (you can paste it here for commenting)

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