Re: [Qexo-general] question about sequence number

[Per Bothner]

Jun Yu wrote:

> Here is my XQuery:
> let $i:=0
> for $v in document("courses.xml"))/semester/lecture
> let $i:=$i+1
> return ...

XQuery does not have assignments.  You cannot modify an existing 
variable.  In your example you have two variable that happen to have the 
same name.  The outer $i has the value 0, and the inner $i has value 1. 
 That is because the expression $i+1 is evaluated using the *outer* $i.

Instead use the 'at' clause:

for $v at $i in document("courses.xml"))/semester/lecture
return
<table>
<tr>
<td>{$i}.</td>
<td>{string($v/@type)}: </td>
<td>{$v}.</td>
</tr>
</table>
--
        --Per Bothner
address@hidden   http://per.bothner.com/