Hi Jean-Marc (answering on behalf of Dirk… Let’s see who is faster ;),

your query will work if you change the xquery:eval call as follows:

    xquery:eval($query || $exp,$vars)

Best,

Christian

On Sat, Feb 1, 2014 at 11:44 AM, jean-marc Mercier <jeanmarc.mercier@gmail.com> wrote:

Dirkk, thx for your answer.

I am really sorry, but definitively, I don't know how to use xquery:eval with the last release.

Following your advise, I tried the following one, but it does not work:

declare function local:eval_helper($exp, $args){

    let $query := 'declare variable $xml external; $xml'

    let $vars  := map { '$xml':= $args }

    return

    xquery:eval('$xml'||$exp,$vars)

};

declare variable $test := <toto><tata>1</tata></toto>;

local:eval_helper('//tata', $test)

Could you try yourself ? I mean, can you make the above user case working ? This use case worked fineley with BaseX7.8 beta 6aeaebf, before the external variable correction.

2014-02-01 Dirk Kirsten <dk@basex.org>:

Hi Jean-Marc,

external variables now have to be explicitly declared. You can do so by:

    declare variable $xml external;

Cheers,
Dirk

On 01/02/14 09:16, jean-marc Mercier wrote:
> Hi,
>
> I am extensively using a function wrapping xquery:eval. My use case is
> roughly the following :
>
> declare function local:eval_helper($exp,
> $args){xquery:eval('$xml'||$exp,map{'$xml' := $args})};
> declare variable $test := <toto><tata>1</tata></toto>;
> local:eval_helper3('//tata', $test)
>
>
> Since the following correction : [1]
> https://github.com/BaseXdb/basex/issues/833, the previous code raises now a
>  [XPST0008] Undefined variable $xml.
>
> I have tried several combinations to find a workaround, none are working :
>
> - declare function local:eval_helper($exp,
> $args){xquery:eval(''||$exp,map{'' := $args})};
> ([XPDY0050] Root of the context item must be a document node.).
> - declare function local:eval_helper($exp, $args){xquery:evaluate($arg||$exp)};
>
> [XPTY0019] Steps within a path expression must yield nodes; xs:integer
> found.
> -- declare variable $xml external := "xml", : [XPST0008] Undefined variable
> $xml.
>
> What is the correct workaround ?
>
>
> Cheers
>
> Jean-Marc
>
>
>

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