On Tue, Jul 19, 2016 at 6:23 PM +0100, "Christian Grün" <christian.gruen@gmail.com> wrote:

$d// item/@qcode="tx"

…returns a boolean value (true or false). Hence,

for $d in $d// item/@qcode="tx"

is the same as

   for $d in true()

or

  for $d in false()

As a result,

  $d//subj

will give you an error (node expected, boolean found).




On Tue, Jul 19, 2016 at 7:16 PM, Mohamed kharrat  wrote:
> Thank you, it works :)
> What about the error? error: [XPTY0019] descendant::subj: node expected,
> xs:boolean found: false().
> Any idea please?
>
>
> ________________________________
> De : Maximilian Gärber 
> À : Mohamed kharrat 
> Cc : BaseX Talk 
> Envoyé le : Mardi 19 juillet 2016 17h44
> Objet : Re: [basex-talk] querying database
>
> Hi,
>
> you do not need to use doc() or collection() if your documents are
> stored in a database.
>
> The documents are just nodes as well, so doing something like:
>
> let $db :=  db:open('some-db')
> for $d in $db//item/@qcode="tx"
> return $d
>
> would return the items from all nodes (all files)
>
> BTW: I guess you want: $db// item[@qcode="tx"]
>
> Regards,
> Max
>
> 2016-07-19 18:33 GMT+02:00 Mohamed kharrat :
>> Hi,
>> i have created a database in BaseX GUI but i did not understand how to use
>> it inside FLWR query.
>> So  since i would like to create one FLWR query to query all my files in
>> the
>> database not only one file with doc()
>> i have tried collection()  is that right? (i have putted all my xml files
>> inside path/ directory)
>> This is my query:
>>
>> let $d:= collection ("path/")
>> let $r:= doc("myfile1.xml")
>> for $d in $d// item/@qcode="tx"
>> where $d//subj[text() contains text { 'Hal', 'Fade' } any] and $r/subj
>> ="Berlin"
>> return
>> $d/tit
>>
>>
>> it shows me error: [XPTY0019] descendant::subj: node expected, xs:boolean
>> found: false().
>>
>> what is that error about?
>> ----
>> Thank you
>> Best regards
>
>