Or, if you are horrified by the inneficiency of such operation, use a scripting
extension to XQuery, like the
one bellow:
http://www.zorba-xquery.com/html/scripting_spec.html
All functional languages have side-effecting extensions (that I know).
All SQL implementations also have a procedural extension.
Best
Dana
On May 15, 2013, at 8:05 AM, David Lee wrote:
> In XQuery (neglecting some vendor specific extensions) variables are imutable.
> Thus it is counter-productive to think "I have a list then I want to add to
> it"
> Rather thing "I have a function which I wish to produce a final list"
>
> Like this
>
> declare function addlist( $list as xs:string* , $item as xs:string) as
> xs:string*
> {
> if( $item = $list ) then $list else ( $list , $item )
>
> };
>
> let $list := addlist( () , "apples" ) ,
> $list := addlist( $list , "pears" ),
> $list := addlist( $list , "peaches" ),
> $list := addlist( $list , "apples" ),
> $list := addlist( $list , "pumpkins" )
> return $list
>
> This *looks like* it is adding values to $list but in fact it is assigning a
> new variable called $list for every expression
> based on the previous value and possibly adding one more.
>
>
>
>
>
>
>
>
>
>
>
>
> ----------------------------------------
> David A. Lee
> [email protected]
> http://www.xmlsh.org
>
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Kunal Chauhan
> Sent: Wednesday, May 15, 2013 10:48 AM
> To: [email protected]
> Subject: [xquery-talk] Is it possible to maintain a list of value in XQuery
>
> Hi,
>
> I want to maintain a list of value.
>
> for eg:
> initially I have blank list and through some process I add values in to the
> list.
>
> like (Apple,Banana,Cherry)
>
> now, when get Apple as an output 2nd time it will check into the list.
> If present than don't add value into the list otherwise add it.
> At last I will return the list.
>
> I don't know whether it's possible or not.
> But this there any work around.
>
> Thanks and Regards,
>
> --
> Kunal Chauhan
> [email protected]
> [+918655517141]
> [+919904983614]
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