Re: Whose error is it anyway

Happened again.

My code. <xsl:template
match="*[map:contains($actions,tokenize(.,'\W')[1][matches(.,'\i\c*')])]">

Clearly it doesn't like the zero length string.

Warning at char 1 in xsl:template/@match on line 63 column 92 of *****.xsl:
  XPTY0004  An error occurred matching pattern
  {element()[Q{http://www.w3.org/2005/xpath-functions/map}contains($actions,
  exactly-one((first(tokenize(convertUntyped(data(.)), "\W",
"")))[matches(., "\i\c*", "")]))]}:
Error at char 9 in expression in xsl:element/@name on line 67 column 55 of
******.xsl:
  XTDE0820  Supplied element name is a zero-length string

On Thu, Aug 13, 2020 at 6:40 PM Ihe Onwuka <[email protected]> wrote:

> I tried but cannot reconstruct a snippet that reproduces. The hint as to
> what happened in my use case was the best I could offer.
>
> On Thu, Aug 13, 2020 at 6:15 PM Michael Kay <mike-JkSD5nQpfvpWk0Htik3J/[email protected]> wrote:
>
>> If you post a repro that we can run, that's useful as we can examine the
>> error messages, see what's causing them, and test any improvements. With
>> only snippets like this, there's not really any effective action we can
>> take.
>>
>> Michael Kay
>> Saxonica
>>
>> On 13 Aug 2020, at 18:53, Ihe Onwuka <[email protected]> wrote:
>>
>> I can tell you that the error went away when I eliminated the possibility
>> of the context element being empty. I struggle to correlate that back to
>> the error message that was displayed.
>>
>> On Thu, Aug 13, 2020 at 10:16 AM Graydon <[email protected]> wrote:
>>
>>> Both?  The hints about what the optimizer thinks is happening are useful
>>> right up until I can't tell where the error is.
>>>
>>> On August 13, 2020 1:40:48 PM UTC, Michael Kay <mike-JkSD5nQpfvpWk0Htik3J/[email protected]>
>>> wrote:
>>> >Yes, we should probably retain the original pattern as a string rather
>>> >than trying to reconstitute it from the compiled form.
>>> >
>>> >Michael Kay
>>> >Saxonica
>>> >
>>> >> On 13 Aug 2020, at 13:52, Ihe Onwuka <[email protected]> wrote:
>>> >>
>>> >> This is not my code.
>>> >>
>>> >> Warning at char 1 in xsl:template/@match on line 62 column 72 of
>>> >******.xsl:
>>> >>   XPTY0004  An error occurred matching pattern
>>> >>
>>> >{element()[Q{
>>> http://www.w3.org/2005/xpath-functions/map}contains($actions
>>> ><http://www.w3.org/2005/xpath-functions/map%7Dcontains($actions>,
>>> >>   exactly-one(first(tokenize(convertUntyped(data(.)), "\s", ""))))]}:
>>> >>
>>> >> My code was
>>> >>
>>> >>
>>> >>    <xsl:template
>>> >match="*[map:contains($actions,tokenize(.,'\s')[1])]">
>>> >> _______________________________________________
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