XQuery problem

Question

Hi All,
I have am XML document for Machines as follows
<xmldb>
<machines name = "machine1">
<part>nut<\part>
<part>nut<\part>
<part>bolt<\part>
<machines name = "machine2">
<part>bolt<\part>
<part>hinge<\part>
<machines name = "machine3">
<part>nut<\part>
<\xmldb>
I want to know which all machines have more than 1 parts as 'nut'.
I framed a query as
For $i in document("db.xml")/xmldb/machines
Let $j :=$i[part="nut"]
where count($j)>1
Return $i
But I get the error : primary exception unknown switch '-1'. I do not understand why I get this error.
Also, if there is some error in this query, then what could be the alternative way of framing this query ?
Thanks in advance
GAURAV

Answer 1

Gaurav,
First of all, your xml doc is ill-formed. Here is a well-formed version:
<xmldb>
<machines name = "machine1">
<part>nut</part>
<part>nut</part>
<part>bolt</part>
</machines>
<machines name = "machine2">
<part>bolt</part>
<part>hinge</part>
</machines>
<machines name = "machine3">
<part>nut</part>
</machines>
</xmldb>
Below is what I got with a corrected query:
XQL> for $i in doc("db.xml")/xmldb/machines
2 let $j := count($i[part="nut"]/part)
3 where $j > 1
4 return $i
5 /;
Result
<machines name="machine1">
<part>nut</part>
<part>nut</part>
<part>bolt</part>
</machines>
Regards,
Geoff