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Re: [xsl] Issues with xs:error in the XPath 3.0 and XDM 3.0 Recommendations.


Subject: Re: [xsl] Issues with xs:error in the XPath 3.0 and XDM 3.0 Recommendations.
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Sat, 19 Apr 2014 16:03:16 -0700

I apologize, but I am still curious to see a legal (and if possible
meaningful) XPath expression that involves xs:error.

I tried this in BaseX and it works, but it seems totally wrong to me
-- returning a type! And from the explanations about xs:error, it
would be an error to use it as a constructor.

let $v := 3
    return
      if($v eq 2) then xs:error
       else $v



On Sat, Apr 19, 2014 at 3:55 PM, Dimitre Novatchev <dnovatchev@xxxxxxxxx> wrote:
> On Sat, Apr 19, 2014 at 3:45 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>> By way of background to this, it was realised at a fairly late stage that if all built-in types from XSD 1.1
>> were to be supported in XPath 3.0, then this included xs:error and t would be a good idea
>> to say something about how xs:error should behave; the only alternative was to specifically exclude it.
>> Everything the specs say about xs:error is a consequence of the fact that (a) xs:error is a built-in type,
>> and (b) it is defined as a union type with no member types. There is no special treatment of xs:error,
>> merely explanations of the consequences of its existence and the way it is defined.
>
> Thank you, Michael,
>
> Is it then a logical conclusion to try to avoid (never use) the
> xs:error type in XPath?
>
>
> Cheers,
> Dimitre Novatchev



-- 
Cheers,
Dimitre Novatchev
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