[xsl] In the xquery, how do i access the counter in for-each?

Eg:
for $x in doc("books.xml")/bookstore/book
where $x/price>30  => want the loop counter.
order by $x/title
return $x/title

If "doc("books.xml")/bookstore/book"  returns 3 elements(book1, book2, book3), 
and during the looping, I want to get loop counter value. 

For the first element, I want to prepare string using loop counter like  
"elem-1", and for the second, I want "elem-2"


Thank you for your help.

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