Re: Fwd: Spurious error on recursive invocation of fn:transform

On Tue, Nov 24, 2020 at 7:32 AM Michael Kay <mike-JkSD5nQpfvpWk0Htik3J/[email protected]> wrote:

>
>> The usage of doc('') is not the causation here
>
> stylesheet-node :
> doc('fullpathToTheStylesheetAsGeneratedWithdocument-uri/myStylesheet.xsl')
>
> the exact same result.
>
>
>>
> It's not so much the use of doc(""), as the reliance on preservation of a
> base URI.
>
> Having said that, if you can put together a repro we'll be happy to look
> at it. I think it's fairly clear the problem is happening because the base
> URI is being lost through the call on fn:transform(), but whether losing it
> is a bug or an application error is something we can only determine if we
> study the detail.
>
> Michael Kay
> Saxonica
>

Here.

Here is bug.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:fn="http://www.w3.org/2005/xpath-functions"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       xmlns:local="urn:local"
version="3.0" >

   <xsl:mode on-no-match="shallow-copy"/>
   <xsl:function name="local:generateNextVersion" as="document-node()">
      <xsl:param name="currentVersion" as="document-node()"/>
      <xsl:variable name="isFinalVersion" as="xs:boolean"
select="$currentVersion/* eq '3'"/>
      <xsl:sequence select="if ($isFinalVersion)
                            then $currentVersion
                            else local:generateNextVersion(fn:transform(map
{

 'stylesheet-node' : doc(''),
                                                    'source-node'     :
 $currentVersion
                                                            })?output)"/>
   </xsl:function>

   <xsl:template match="*">
  <xsl:message select="."/>
      <xsl:copy>
         <xsl:sequence select="let $customizedResult := fn:transform(map {

'stylesheet-node' :  doc('bugs2.xsl'),
                                                              'source-node'
    :  /
                                                               })?output
                               return
 local:generateNextVersion($customizedResult)"/>
       </xsl:copy>
   </xsl:template>

 </xsl:stylesheet>

Here is bugs2.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:fn="http://www.w3.org/2005/xpath-functions"
version="3.0" >

   <xsl:mode on-no-match="shallow-copy"/>
   <xsl:template match="*">
      <xsl:copy>
         <xsl:value-of select=". + 1"/>
      </xsl:copy>
   </xsl:template>

 </xsl:stylesheet>

Here is input XML

<bug>1</bug>

Reproduction instructions.

Run the transform bug.xsl against input bug.xml and see the xsl:message
output below

<bug>1</bug>
<bug>2</bug>

Change bug.xsl to test for $currentVersion eq '4' instead of 3

crashes as below

<bug>1</bug>
<bug>2</bug>
Error in bugs2.xsl:
  XTSE0150  The supplied file does not appear to be a stylesheet
Static error in bugs2.xsl:
  XTSE0150  The supplied file does not appear to be a stylesheet
Error in bugs2.xsl:
  XTSE0150  The supplied file does not appear to be a stylesheet
at function local:generateNextVersion in bug.xsl:
     invoked by function call
  In template rule with match="*" of bug.xsl
     invoked by built-in template rule (shallow-copy)
The supplied file does not appear to be a stylesheet

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