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(<http:request method="get"/>, $url)
> return
> if (head($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(<http:request method="get"/>,
> "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
