The order by clause has to be static. You can play some games with simple 
cases, but for complex cases you pretty much have to build a string and call 
xdmp:value on it. The search:search function and its resolve cousins do this 
for you, or you can build it yourself.

-- Mike
 
On 27 Mar 2013, at 12:19 , "Tim" <[email protected]> wrote:

> Hi Folks,
>  
> Is there a simple way to program the order by clause in FLWOR to make it 
> optional based on parameters?  I have a web page that I want to sort as 
> indicated by the user.
>  
> For example, this code illustrates what I’d like to do but doesn’t work:
>  
> let $sort-option := “a descending”
> return
> for $row in $rows
> let $a := $row/a/text()
> let $b := $row/b/text()
> order by {if ($sort-option eq “a ascending”) then $a ascending else $default}
> return <tr><td>{$a}</td><td>{$b}</td></tr>
>  
> Thanks!
>  
> Tim Meagher
>  
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