Re: [basex-talk] XPTY0004 error when calling http:send-request inside of a local function
Christian,
As always, thank you for your help! I had tried the following
```xquery
declare function local:grab2(
$url as xs:string,
$path as xs:string,
$fname as xs:string
) as document-node() {
let $req := http:send-request(, $url)
return
if (head($req)/@status = "200")
then file:write($path || $fname, tail($req), map { "method": "xml" })
else document { element error { "something went wrong" } }
};
```
and had the same error - adding an occurrence indicator on the return type
solves it for that trial, too.
Much appreciated!
Best,
Bridger
On Sun, Oct 11, 2020 at 4:06 PM Christian Grün
wrote:
> Hi Bridger,
>
> As your query will either return an empty sequence (in the case of
> success) or a string (in the case of an error), you’ll need to use
> xs:string? as return type:
>
> declare function local:grab(
> $url as xs:string,
> $path as xs:string,
> $fname as xs:string
> ) as xs:string? {
> ...
>
> Hope this helps, cheers,
> Christian
>
>
>
> > let $req := http:send-request(, $url)
> > return
> > if (head($req)/@status = "200")
> > then file:write($path || $fname, tail($req), map { "method": "xml" })
> > else ("something went wrong!")
> > };
> > ```
> >
> > but I've noticed that in version 9.4.3 this returns an XPTY error:
> > Stopped at /home/bridger/bin/basex-src/basex-943-xpty0004-error.xq, 1/18:
> > [XPTY0004] Cannot promote xs:string* to document-node(): (let $req_7 :=
> http:send-request(, "
> https://dpla.lib.utk.edu/repox/OAIHa
> >
> > While this could be a bug, should I be writing this kind of local
> function differently? Or could I improve my typing on it?
> >
> > Thanks very much for any advice or insights you can provide.
> > Best,
> > Bridger
>
Re: [basex-talk] XPTY0004 error when calling http:send-request inside of a local function
Hi Bridger,
As your query will either return an empty sequence (in the case of
success) or a string (in the case of an error), you’ll need to use
xs:string? as return type:
declare function local:grab(
$url as xs:string,
$path as xs:string,
$fname as xs:string
) as xs:string? {
...
Hope this helps, cheers,
Christian
> let $req := http:send-request(, $url)
> return
> if (head($req)/@status = "200")
> then file:write($path || $fname, tail($req), map { "method": "xml" })
> else ("something went wrong!")
> };
> ```
>
> but I've noticed that in version 9.4.3 this returns an XPTY error:
> Stopped at /home/bridger/bin/basex-src/basex-943-xpty0004-error.xq, 1/18:
> [XPTY0004] Cannot promote xs:string* to document-node(): (let $req_7 :=
> http:send-request(,
> "https://dpla.lib.utk.edu/repox/OAIHa
>
> While this could be a bug, should I be writing this kind of local function
> differently? Or could I improve my typing on it?
>
> Thanks very much for any advice or insights you can provide.
> Best,
> Bridger
Re: [basex-talk] XPTY0004 error when calling http:send-request inside of a local function
And naturally I forgot to mention...
On Sun, Oct 11, 2020 at 3:49 PM Bridger Dyson-Smith
wrote:
> Hi all -
>
> I'm accustomed to writing something like the following:
>
> ```xquery
>
> declare function local:grab(
> $url as xs:string,
> $path as xs:string,
> $fname as xs:string
> ) as document-node() {
> let $req := http:send-request(, $url)
> return
> if (head($req)/@status = "200")
> then file:write($path || $fname, tail($req), map { "method": "xml" })
> else ("something went wrong!")
> };
> ```
>
> but I've noticed that in version 9.4.3 this returns an XPTY error:
> Stopped at /home/bridger/bin/basex-src/basex-943-xpty0004-error.xq, 1/18:
> [XPTY0004] Cannot promote xs:string* to document-node(): (let $req_7 :=
> http:send-request(, "
> https://dpla.lib.utk.edu/repox/OAIHa
>
> that despite the error, the correct response is written to the filepath
specified.
While this could be a bug, should I be writing this kind of local function
> differently? Or could I improve my typing on it?
>
> Thanks very much for any advice or insights you can provide.
>
Apologies for the omission!
> Best,
> Bridger
>
