selection

dear all
suppose i have this xml file book.xml
<bookstore>
<book>
        <title>seven years in trenton</title>
        <price>12</price>

</book>
<book>
        <title> history of trenton</title>
                <price> 55</price>
</book>
</bookstore>

when I issue the following statement
let $j:= doc("book.xml")//book [price > 12]
$j discarded the book with 12 price but my problem is
that $j now is standing at node book, I want $j to
discard the book with 12 and stop at bookstore(the
root)




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